{"id":7384,"date":"2026-10-21T10:56:29","date_gmt":"2026-10-21T02:56:29","guid":{"rendered":"https:\/\/domirefrigeration.com\/?p=7384"},"modified":"2026-10-21T10:56:29","modified_gmt":"2026-10-21T02:56:29","slug":"difference-de-temperature-moyenne-logarithmique","status":"publish","type":"post","link":"https:\/\/domirefrigeration.com\/fr\/log-mean-temperature-difference\/","title":{"rendered":"Diff\u00e9rence de temp\u00e9rature moyenne logarithmique (LMTD) : calculs et v\u00e9rifications de la classification des \u00e9changeurs de chaleur"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"7384\" class=\"elementor elementor-7384\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt0000a7 e-con-full e-flex e-con e-parent\" data-id=\"rt0000a7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-rt000097 e-con-full e-flex e-con e-parent\" data-id=\"rt000097\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-rt000002 e-con-full e-flex e-con e-parent\" data-id=\"rt000002\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000001 elementor-widget elementor-widget-text-editor\" data-id=\"rt000001\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>La diff\u00e9rence de temp\u00e9rature logarithmique moyenne, ou LMTD, d\u00e9crit la force motrice effective entre deux flux dans un mod\u00e8le d'\u00e9changeur de chaleur appropri\u00e9. Calculez-la \u00e0 partir des diff\u00e9rences de temp\u00e9rature entre les flux aux deux extr\u00e9mit\u00e9s : LMTD = (\u0394T\u2081 \u2212 \u0394T\u2082) \/ ln(\u0394T\u2081 \/ \u0394T\u2082). Utilisez le logarithme naturel, associez les temp\u00e9ratures selon le sch\u00e9ma d'\u00e9coulement et v\u00e9rifiez les hypoth\u00e8ses du mod\u00e8le avant d'utiliser le r\u00e9sultat pour une \u00e9valuation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000003 elementor-widget elementor-widget-text-editor\" data-id=\"rt000003\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Une formule correcte avec des paires de temp\u00e9ratures incorrectes peut produire une r\u00e9ponse plausible et une exigence de surface incorrecte. Lors de l'examen d'une proposition de bobine ou d'\u00e9changeur de chaleur, reliez les quatre temp\u00e9ratures terminales au sch\u00e9ma d'\u00e9coulement, \u00e0 l'\u00e9quilibre thermique et \u00e0 la m\u00e9thode de calcul d\u00e9clar\u00e9e.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000004 elementor-widget elementor-widget-text-editor\" data-id=\"rt000004\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Ce guide d\u00e9veloppe un exemple hypoth\u00e9tique liquide-\u00e0-liquide, puis s\u00e9pare le calcul des v\u00e9rifications n\u00e9cessaires pour un \u00e9quipement \u00e0 passages multiples, le changement de phase du r\u00e9frig\u00e9rant et les serpentins de refroidissement humide. Tous les cas num\u00e9riques sont illustratifs, non des r\u00e9sultats de test Domi. Les illustrations originales expliquent les concepts ; elles ne sont pas des dessins de production ni une preuve de la performance d\u2019un produit particulier.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000005 elementor-widget elementor-widget-text-editor\" data-id=\"rt000005\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Aller \u00e0 <a href=\"#record-the-four-terminal-temperatures\"><u>les quatre temp\u00e9ratures<\/u><\/a>, <a href=\"#pair-the-ends-correctly-for-counterflow\"><u>association contre-courant<\/u><\/a>, <a href=\"#work-through-a-balanced-120-kw-example\"><u>le calcul effectu\u00e9<\/u><\/a>, <a href=\"#handle-equal-and-nearly-equal-terminal-differences\"><u>diff\u00e9rences terminales \u00e9gales<\/u><\/a>, <a href=\"#separate-a-condensing-zone-from-the-complete-refrigerant-circuit\"><u>changement de phase du r\u00e9frig\u00e9rant<\/u><\/a> or <a href=\"#check-the-measurements-before-rejecting-the-exchanger\"><u>v\u00e9rifications de mesure<\/u><\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000098 e-con-full e-flex e-con e-parent\" data-id=\"rt000098\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000006 elementor-widget elementor-widget-heading\" data-id=\"rt000006\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"what-does-log-mean-temperature-difference-measure\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Que mesure la diff\u00e9rence de temp\u00e9rature logarithmique moyenne ?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000007 elementor-widget elementor-widget-text-editor\" data-id=\"rt000007\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>L'\u00e9cart de temp\u00e9rature entre deux flux change g\u00e9n\u00e9ralement lorsqu'ils \u00e9changent de la chaleur. La LMTD prend en compte cette variation d'\u00e9cart sous les hypoth\u00e8ses du mod\u00e8le choisi. Elle diff\u00e8re de la hausse ou de la baisse de temp\u00e9rature de l\u2019un ou l\u2019autre flux seul.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000008 elementor-widget elementor-widget-image\" data-id=\"rt000008\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-changing-driving-force.webp\" class=\"attachment-full size-full wp-image-7376\" alt=\"\u00c9changeur de chaleur Domi Refrigeration avec tubes de fluide orange et bleu et raccords m\u00e9talliques.\" srcset=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-changing-driving-force.webp 1536w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-changing-driving-force-300x200.webp 300w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-changing-driving-force-1024x683.webp 1024w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-changing-driving-force-768x512.webp 768w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-changing-driving-force-18x12.webp 18w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-changing-driving-force-600x400.webp 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000009 elementor-widget elementor-widget-text-editor\" data-id=\"rt000009\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>L\u2019expression logarithmique de base appartient \u00e0 un mod\u00e8le de transfert de chaleur stationnaire avec des hypoth\u00e8ses simplificatrices appropri\u00e9es. Le <a href=\"https:\/\/www.energy.gov\/documents\/doe-hdbk-1012-92vol2\" target=\"_blank\" rel=\"noopener\"><u>Manuel Fondamentaux du DOE, Volume 2<\/u><\/a>, publi\u00e9 en 1992, explique le calcul de la diff\u00e9rence terminale et note les hypoth\u00e8ses concernant la chaleur sp\u00e9cifique et les coefficients de transfert thermique. C\u2019est une r\u00e9f\u00e9rence fondamentale, non un document actuel de classification ou de certification de produit.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00000a elementor-widget elementor-widget-text-editor\" data-id=\"rt00000a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Pour une configuration simple id\u00e9ale avec un coefficient global appropri\u00e9, la relation de classification est Q = U \u00d7 A \u00d7 LMTD. Lorsqu\u2019un facteur de correction est n\u00e9cessaire, une forme courante est Q = U \u00d7 A \u00d7 F \u00d7 LMTD. Maintenez U, la surface et la m\u00e9thode de correction sur une base coh\u00e9rente. Le <a href=\"https:\/\/domirefrigeration.com\/fr\/coefficient-de-transfert-de-chaleur\/\"><u>guide du coefficient de transfert thermique<\/u><\/a> explique les significations s\u00e9par\u00e9es de h, U et UA.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00000b elementor-widget elementor-widget-text-editor\" data-id=\"rt00000b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>La LMTD a des unit\u00e9s de diff\u00e9rence de temp\u00e9rature. Une diff\u00e9rence de 10\u00b0C \u00e9quivaut \u00e0 10 K ; une diff\u00e9rence de 10\u00b0F \u00e9quivaut \u00e0 environ 5,56 K. Calculez les deux diff\u00e9rences terminales dans la m\u00eame unit\u00e9 et maintenez le coefficient de transfert thermique coh\u00e9rent avec cette unit\u00e9. Le rapport du logarithme est sans dimension.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000099 e-con-full e-flex e-con e-parent\" data-id=\"rt000099\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00000c elementor-widget elementor-widget-heading\" data-id=\"rt00000c\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"record-the-four-terminal-temperatures\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Enregistrez les quatre temp\u00e9ratures terminales<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00000d elementor-widget elementor-widget-text-editor\" data-id=\"rt00000d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Notez les temp\u00e9ratures d'entr\u00e9e et de sortie du flux chaud, T_h,in et T_h,out, ainsi que celles d'entr\u00e9e et de sortie du flux froid, T_c,in et T_c,out. Identifiez chaque emplacement sur le sch\u00e9ma du flux avant de soustraire quoi que ce soit.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00000e elementor-widget elementor-widget-image\" data-id=\"rt00000e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-terminal-map.webp\" class=\"attachment-full size-full wp-image-7372\" alt=\"\u00c9changeur de chaleur industriel avec tuyau en cuivre horizontal et bo\u00eetier bleu, connexions \u00e0 bride.\" srcset=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-terminal-map.webp 1536w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-terminal-map-300x200.webp 300w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-terminal-map-1024x683.webp 1024w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-terminal-map-768x512.webp 768w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-terminal-map-18x12.webp 18w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-terminal-map-600x400.webp 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00000f elementor-widget elementor-widget-text-editor\" data-id=\"rt00000f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Les mots \u201c entr\u00e9e \u201d et \u201c sortie \u201d d\u00e9crivent la direction d\u2019un flux. Ils n\u2019identifient pas n\u00e9cessairement la m\u00eame extr\u00e9mit\u00e9 physique pour les deux flux. En contre-courant, l\u2019entr\u00e9e chaude partage une extr\u00e9mit\u00e9 avec la sortie froide. En flux parall\u00e8le, les deux entr\u00e9es partagent une extr\u00e9mit\u00e9.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000010 elementor-widget elementor-widget-text-editor\" data-id=\"rt000010\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Distinguez la temp\u00e9rature terminale en vrac d\u2019un fluide de la temp\u00e9rature d\u2019une paroi de tube, d\u2019une surface de ailettes ou d\u2019une pi\u00e8ce. Une temp\u00e9rature de paroi peut \u00eatre un indice diagnostique utile, mais la remplacer par la temp\u00e9rature du fluide sp\u00e9cifi\u00e9e modifie le calcul.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000011 elementor-widget elementor-widget-text-editor\" data-id=\"rt000011\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Identifiez \u00e9galement si les quatre valeurs sont mesur\u00e9es dans un seul \u00e9tat de fonctionnement, selon des cibles de conception sp\u00e9cifi\u00e9es ou des pr\u00e9visions. Combiner une entr\u00e9e mesur\u00e9e lors d\u2019un test avec une sortie nominale d\u2019un autre ne cr\u00e9e pas un point de r\u00e9f\u00e9rence valide. Conservez l\u2019arrangement du flux, l\u2019identit\u00e9 du fluide et les informations de pression ou de phase avec l\u2019enregistrement de la temp\u00e9rature.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt00009a e-con-full e-flex e-con e-parent\" data-id=\"rt00009a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000012 elementor-widget elementor-widget-heading\" data-id=\"rt000012\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"pair-the-ends-correctly-for-counterflow\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Associez correctement les extr\u00e9mit\u00e9s pour le contre-courant<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000013 elementor-widget elementor-widget-text-editor\" data-id=\"rt000013\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>En contre-courant id\u00e9al, les deux flux se d\u00e9placent en directions oppos\u00e9es. \u00c0 une extr\u00e9mit\u00e9 physique, comparez l\u2019entr\u00e9e chaude avec la sortie froide. \u00c0 l\u2019autre, comparez la sortie chaude avec l\u2019entr\u00e9e froide.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000014 elementor-widget elementor-widget-image\" data-id=\"rt000014\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1774\" height=\"887\" src=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-counterflow.webp\" class=\"attachment-full size-full wp-image-7373\" alt=\"\u00c9quipement Domi Refrigeration avec tubes indicateurs de flux de fluide orange et bleu.\" srcset=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-counterflow.webp 1774w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-counterflow-300x150.webp 300w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-counterflow-1024x512.webp 1024w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-counterflow-768x384.webp 768w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-counterflow-1536x768.webp 1536w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-counterflow-18x9.webp 18w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-counterflow-600x300.webp 600w\" sizes=\"(max-width: 1774px) 100vw, 1774px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000015 elementor-widget elementor-widget-text-editor\" data-id=\"rt000015\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Utilisez ces diff\u00e9rences terminales :<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000016 elementor-widget elementor-widget-text-editor\" data-id=\"rt000016\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul>\n<li>\u0394T\u2081 = T_h,in \u2212 T_c,out<\/li>\n<li>\u0394T\u2082 = T_h,out \u2212 T_c,in<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000017 elementor-widget elementor-widget-text-editor\" data-id=\"rt000017\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Pour le programme hypoth\u00e9tique 80\u219250\u00b0C du c\u00f4t\u00e9 chaud et 20\u219245\u00b0C du c\u00f4t\u00e9 froid, les diff\u00e9rences sont 80 \u2212 45 = 35 K et 50 \u2212 20 = 30 K. Par cons\u00e9quent, LMTD = (35 \u2212 30) \/ ln(35 \/ 30) = 32,44 K, arrondi.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000018 elementor-widget elementor-widget-text-editor\" data-id=\"rt000018\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Changer les noms des extr\u00e9mit\u00e9s 1 et 2 ne modifie pas le r\u00e9sultat : le num\u00e9rateur et le logarithme changent tous deux de signe. Changer quelles temp\u00e9ratures occupent une extr\u00e9mit\u00e9 modifie le r\u00e9sultat. Esquissez les deux fl\u00e8ches et les \u00e9tiquettes des extr\u00e9mit\u00e9s \u00e0 c\u00f4t\u00e9 du calcul pour qu\u2019un autre ing\u00e9nieur puisse reproduire l\u2019association.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt00009b e-con-full e-flex e-con e-parent\" data-id=\"rt00009b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000019 elementor-widget elementor-widget-heading\" data-id=\"rt000019\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"use-different-pairs-for-parallel-flow\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Utilisez des paires diff\u00e9rentes pour le flux parall\u00e8le<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00001a elementor-widget elementor-widget-text-editor\" data-id=\"rt00001a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>En flux parall\u00e8le id\u00e9al, les deux flux entrent par la m\u00eame extr\u00e9mit\u00e9 et se d\u00e9placent dans la m\u00eame direction. Comparez les deux temp\u00e9ratures d\u2019entr\u00e9e \u00e0 l\u2019extr\u00e9mit\u00e9 d\u2019entr\u00e9e et les deux temp\u00e9ratures de sortie \u00e0 l\u2019extr\u00e9mit\u00e9 de sortie.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00001b elementor-widget elementor-widget-image\" data-id=\"rt00001b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1774\" height=\"887\" src=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-parallel-flow.webp\" class=\"attachment-full size-full wp-image-7374\" alt=\"Section transversale de l&#039;\u00e9changeur de chaleur de Domi Refrigeration avec flux de fluide rouge et bleu.\" srcset=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-parallel-flow.webp 1774w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-parallel-flow-300x150.webp 300w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-parallel-flow-1024x512.webp 1024w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-parallel-flow-768x384.webp 768w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-parallel-flow-1536x768.webp 1536w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-parallel-flow-18x9.webp 18w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-parallel-flow-600x300.webp 600w\" sizes=\"(max-width: 1774px) 100vw, 1774px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00001c elementor-widget elementor-widget-text-editor\" data-id=\"rt00001c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Utilisez \u0394T\u2081 = T_h,in \u2212 T_c,in et \u0394T\u2082 = T_h,out \u2212 T_c,out. Pour les m\u00eames cibles terminales hypoth\u00e9tiques, ces \u00e9carts sont 80 \u2212 20 = 60 K et 50 \u2212 45 = 5 K. Cela donne LMTD = (60 \u2212 5) \/ ln(60 \/ 5) = 22,13 K.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000032 e-con-full e-flex e-con e-parent\" data-id=\"rt000032\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-rt000023 e-con-full elementor-hidden-mobile e-flex e-con e-parent\" data-id=\"rt000023\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-rt00001e e-con-full e-flex e-con e-parent\" data-id=\"rt00001e\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00001d elementor-widget elementor-widget-text-editor\" data-id=\"rt00001d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Disposition id\u00e9ale<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000020 e-con-full e-flex e-con e-parent\" data-id=\"rt000020\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00001f elementor-widget elementor-widget-text-editor\" data-id=\"rt00001f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Premi\u00e8re diff\u00e9rence d\u2019extr\u00e9mit\u00e9<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000022 e-con-full e-flex e-con e-parent\" data-id=\"rt000022\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000021 elementor-widget elementor-widget-text-editor\" data-id=\"rt000021\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Deuxi\u00e8me diff\u00e9rence d\u2019extr\u00e9mit\u00e9<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt00002a e-con-full e-flex e-con e-parent\" data-id=\"rt00002a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-rt000025 e-con-full e-flex e-con e-parent\" data-id=\"rt000025\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000024 elementor-widget elementor-widget-text-editor\" data-id=\"rt000024\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Disposition id\u00e9ale :<\/strong> Contre-courant<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000027 e-con-full e-flex e-con e-parent\" data-id=\"rt000027\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000026 elementor-widget elementor-widget-text-editor\" data-id=\"rt000026\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Premi\u00e8re diff\u00e9rence de fin :<\/strong> Inlet chaud moins outlet froid<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000029 e-con-full e-flex e-con e-parent\" data-id=\"rt000029\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000028 elementor-widget elementor-widget-text-editor\" data-id=\"rt000028\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Deuxi\u00e8me diff\u00e9rence de fin :<\/strong> Outlet chaud moins inlet froid<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000031 e-con-full e-flex e-con e-parent\" data-id=\"rt000031\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-rt00002c e-con-full e-flex e-con e-parent\" data-id=\"rt00002c\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00002b elementor-widget elementor-widget-text-editor\" data-id=\"rt00002b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Disposition id\u00e9ale :<\/strong> Flux parall\u00e8le<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt00002e e-con-full e-flex e-con e-parent\" data-id=\"rt00002e\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00002d elementor-widget elementor-widget-text-editor\" data-id=\"rt00002d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Premi\u00e8re diff\u00e9rence de fin :<\/strong> Inlet chaud moins inlet froid<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000030 e-con-full e-flex e-con e-parent\" data-id=\"rt000030\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00002f elementor-widget elementor-widget-text-editor\" data-id=\"rt00002f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Deuxi\u00e8me diff\u00e9rence de fin :<\/strong> Outlet chaud moins outlet froid<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000033 elementor-widget elementor-widget-text-editor\" data-id=\"rt000033\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Ce sont deux conceptions demand\u00e9es pour atteindre les m\u00eames objectifs de temp\u00e9rature. Elles ne montrent pas qu'inverser les connexions sur un \u00e9changeur fixe pr\u00e9serverait les quatre temp\u00e9ratures. Avec une surface fixe, des d\u00e9bits et des conditions d'entr\u00e9e, changer l'agencement modifie g\u00e9n\u00e9ralement les sorties pr\u00e9vues. La conductance requise doit \u00eatre recalcul\u00e9e.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt00009c e-con-full e-flex e-con e-parent\" data-id=\"rt00009c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000034 elementor-widget elementor-widget-heading\" data-id=\"rt000034\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"work-through-a-balanced-120-kw-example\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Travaillez \u00e0 travers un exemple \u00e9quilibr\u00e9 de 120 kW<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000035 elementor-widget elementor-widget-text-editor\" data-id=\"rt000035\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>V\u00e9rifiez l'\u00e9quilibre thermique ainsi que les paires de temp\u00e9ratures. Supposons un fonctionnement en r\u00e9gime permanent, une perte de chaleur n\u00e9gligeable vers l'environnement et deux liquides monophas\u00e9s. Utilisez une capacit\u00e9 calorifique constante c_p de 4,0 kJ\/(kg\u00b7K) pour chacun. Laissez le d\u00e9bit chaud \u00eatre de 1,0 kg\/s et le d\u00e9bit froid de 1,2 kg\/s. Conservez les quatre temp\u00e9ratures utilis\u00e9es ci-dessus.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000036 elementor-widget elementor-widget-image\" data-id=\"rt000036\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1774\" height=\"887\" src=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-worked-example.webp\" class=\"attachment-full size-full wp-image-7375\" alt=\"\u00c9changeur de chaleur de Domi Refrigeration avec lignes d&#039;eau chaude et d&#039;eau froide \u00e9tiquet\u00e9es pour 80\u00b0C, 50\u00b0C, 45\u00b0C et.\" srcset=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-worked-example.webp 1774w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-worked-example-300x150.webp 300w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-worked-example-1024x512.webp 1024w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-worked-example-768x384.webp 768w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-worked-example-1536x768.webp 1536w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-worked-example-18x9.webp 18w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-worked-example-600x300.webp 600w\" sizes=\"(max-width: 1774px) 100vw, 1774px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000037 elementor-widget elementor-widget-text-editor\" data-id=\"rt000037\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Le c\u00f4t\u00e9 chaud lib\u00e8re Q_h = 1,0 \u00d7 4,0 \u00d7 (80 \u2212 50) = 120 kW. Le c\u00f4t\u00e9 froid re\u00e7oit Q_c = 1,2 \u00d7 4,0 \u00d7 (45 \u2212 20) = 120 kW. Les deux c\u00f4t\u00e9s sont en accord dans les hypoth\u00e8ses \u00e9nonc\u00e9es. Pour un fluide r\u00e9el, utilisez ses propri\u00e9t\u00e9s appropri\u00e9es plut\u00f4t que de supposer cette capacit\u00e9 calorifique sp\u00e9cifique.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000038 elementor-widget elementor-widget-text-editor\" data-id=\"rt000038\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Le <a href=\"https:\/\/www.alfalaval.de\/microsites\/gphe\/tools\/calculation-method\/\" target=\"_blank\" rel=\"noopener\"><u>m\u00e9thode de calcul de l\u2019\u00e9changeur de chaleur \u00e0 plaques Alfa Laval<\/u><\/a> identifie les programmes de temp\u00e9rature, les d\u00e9bits, la charge thermique et les pertes de pression admissibles parmi les param\u00e8tres de conception. Son cadre de calcul permet de maintenir ces quantit\u00e9s ensemble. Les chiffres ici sont un exemple illustratif s\u00e9par\u00e9.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000039 elementor-widget elementor-widget-text-editor\" data-id=\"rt000039\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Avec F = 1 pour chaque configuration id\u00e9ale, le UA requis est Q \/ LMTD :<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000056 e-con-full e-flex e-con e-parent\" data-id=\"rt000056\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-rt000040 e-con-full elementor-hidden-mobile e-flex e-con e-parent\" data-id=\"rt000040\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-rt00003b e-con-full e-flex e-con e-parent\" data-id=\"rt00003b\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00003a elementor-widget elementor-widget-text-editor\" data-id=\"rt00003a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Base de calcul<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt00003d e-con-full e-flex e-con e-parent\" data-id=\"rt00003d\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00003c elementor-widget elementor-widget-text-editor\" data-id=\"rt00003c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>LMTD<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt00003f e-con-full e-flex e-con e-parent\" data-id=\"rt00003f\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00003e elementor-widget elementor-widget-text-editor\" data-id=\"rt00003e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>UA requis pour 120 kW<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000047 e-con-full e-flex e-con e-parent\" data-id=\"rt000047\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-rt000042 e-con-full e-flex e-con e-parent\" data-id=\"rt000042\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000041 elementor-widget elementor-widget-text-editor\" data-id=\"rt000041\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Base de calcul :<\/strong> Contre-courant id\u00e9al<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000044 e-con-full e-flex e-con e-parent\" data-id=\"rt000044\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000043 elementor-widget elementor-widget-text-editor\" data-id=\"rt000043\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>LMTD :<\/strong> 32,44 K<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000046 e-con-full e-flex e-con e-parent\" data-id=\"rt000046\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000045 elementor-widget elementor-widget-text-editor\" data-id=\"rt000045\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>UA requis pour 120 kW :<\/strong> 3,700 kW\/K<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt00004e e-con-full e-flex e-con e-parent\" data-id=\"rt00004e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-rt000049 e-con-full e-flex e-con e-parent\" data-id=\"rt000049\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000048 elementor-widget elementor-widget-text-editor\" data-id=\"rt000048\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Base de calcul :<\/strong> Flux parall\u00e8le id\u00e9al<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt00004b e-con-full e-flex e-con e-parent\" data-id=\"rt00004b\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00004a elementor-widget elementor-widget-text-editor\" data-id=\"rt00004a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>LMTD :<\/strong> 22,13 K<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt00004d e-con-full e-flex e-con e-parent\" data-id=\"rt00004d\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00004c elementor-widget elementor-widget-text-editor\" data-id=\"rt00004c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>UA requis pour 120 kW :<\/strong> 5,422 kW\/K<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000055 e-con-full e-flex e-con e-parent\" data-id=\"rt000055\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-rt000050 e-con-full e-flex e-con e-parent\" data-id=\"rt000050\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00004f elementor-widget elementor-widget-text-editor\" data-id=\"rt00004f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Base de calcul :<\/strong> Approximation arithm\u00e9tique du flux parall\u00e8le<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000052 e-con-full e-flex e-con e-parent\" data-id=\"rt000052\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000051 elementor-widget elementor-widget-text-editor\" data-id=\"rt000051\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>LMTD :<\/strong> 32,50 K<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt000054 e-con-full e-flex e-con e-parent\" data-id=\"rt000054\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000053 elementor-widget elementor-widget-text-editor\" data-id=\"rt000053\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>UA requis pour 120 kW :<\/strong> 3,692 kW\/K, ce qui sous-estime la n\u00e9cessit\u00e9 de ce mod\u00e8le<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000057 elementor-widget elementor-widget-text-editor\" data-id=\"rt000057\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>La moyenne arithm\u00e9tique des diff\u00e9rences de fin de flux parall\u00e8le est (60 + 5) \/ 2 = 32,50 K. La remplacer par 22,13 K sous-estime le UA requis d\u2019environ 31,9%. Si U \u00e9tait maintenu constant sur la m\u00eame base de surface, la surface calcul\u00e9e aurait la m\u00eame sous-estimation en pourcentage. Il s\u2019agit d\u2019une comparaison math\u00e9matique conditionnelle, non d\u2019une \u00e9conomie ou p\u00e9nalit\u00e9 mesur\u00e9e pour un produit.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000058 elementor-widget elementor-widget-text-editor\" data-id=\"rt000058\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/www.spiraxsarco.com\/learn-about-steam\/steam-engineering-principles-and-heat-transfer\/heat-transfer?sc_lang=en-GB\" target=\"_blank\" rel=\"noopener\"><u>Explication du transfert de chaleur de Spirax Sarco<\/u><\/a> distingue les diff\u00e9rences logarithmiques et arithm\u00e9tiques moyennes et explique pourquoi la force motrice changeante est importante. La tol\u00e9rance d\u2019une approximation d\u00e9pend des diff\u00e9rences de fin r\u00e9elles et de l\u2019objectif du calcul. Le grand d\u00e9s\u00e9quilibre entre 60 K et 5 K rend cette m\u00e9thode simplifi\u00e9e inadapt\u00e9e dans cet exemple.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt00009d e-con-full e-flex e-con e-parent\" data-id=\"rt00009d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000059 elementor-widget elementor-widget-heading\" data-id=\"rt000059\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"handle-equal-and-nearly-equal-terminal-differences\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">G\u00e9rer les diff\u00e9rences terminales \u00e9gales ou presque \u00e9gales<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00005a elementor-widget elementor-widget-text-editor\" data-id=\"rt00005a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Lorsque les deux diff\u00e9rences terminales positives sont \u00e9gales, la formule affich\u00e9e donne 0\/0 si \u00e9valu\u00e9e litt\u00e9ralement. Sa limite est la diff\u00e9rence commune. Si \u0394T\u2081 = \u0394T\u2082 = 20 K, alors LMTD = 20 K.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00005b elementor-widget elementor-widget-image\" data-id=\"rt00005b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-equal-terminal-gaps.webp\" class=\"attachment-full size-full wp-image-7377\" alt=\"\u00c9changeur de chaleur industriel \u00e0 tubes en cuivre avec bo\u00eetier en acier inoxydable flasqu\u00e9.\" srcset=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-equal-terminal-gaps.webp 1536w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-equal-terminal-gaps-300x200.webp 300w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-equal-terminal-gaps-1024x683.webp 1024w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-equal-terminal-gaps-768x512.webp 768w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-equal-terminal-gaps-18x12.webp 18w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-equal-terminal-gaps-600x400.webp 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00005c elementor-widget elementor-widget-text-editor\" data-id=\"rt00005c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Une feuille de calcul doit g\u00e9rer cette limite plut\u00f4t que de signaler une erreur ou z\u00e9ro. Lorsque les \u00e9carts sont tr\u00e8s proches, soustraire des nombres presque \u00e9gaux et diviser par un logarithme tr\u00e8s petit peut aussi cr\u00e9er une sensibilit\u00e9 num\u00e9rique. Utilisez une routine logarithmique moyenne valid\u00e9e ou une impl\u00e9mentation stable appropri\u00e9e, et conservez une pr\u00e9cision suffisante avant d\u2019arrondir le r\u00e9sultat final.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00005d elementor-widget elementor-widget-text-editor\" data-id=\"rt00005d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Un \u00e9cart positif \u00e9gal est diff\u00e9rent d\u2019un \u00e9cart terminal approchant z\u00e9ro alors que l\u2019autre reste positif. Dans ce dernier cas limite, le LMTD tend vers z\u00e9ro. Un devoir positif sp\u00e9cifi\u00e9 exige alors d\u2019augmenter le UA dans le mod\u00e8le simple. Un \u00e9cart terminal nul ou invers\u00e9 n\u00e9cessite une revue du mod\u00e8le et de la faisabilit\u00e9 ; prendre la valeur absolue pour forcer un r\u00e9sultat positif dans la feuille de calcul masque le probl\u00e8me.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt00009e e-con-full e-flex e-con e-parent\" data-id=\"rt00009e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00005e elementor-widget elementor-widget-heading\" data-id=\"rt00005e\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"distinguish-outlet-crossover-from-a-local-temperature-reversal\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Distinguer le croisement en sortie d\u2019un renversement de temp\u00e9rature local<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00005f elementor-widget elementor-widget-text-editor\" data-id=\"rt00005f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>En contre-courant, la sortie froide peut \u00eatre plus chaude que la sortie chaude car ces sorties sont situ\u00e9es \u00e0 des extr\u00e9mit\u00e9s diff\u00e9rentes. Cette seule comparaison n'\u00e9tablit pas une violation de la direction locale du transfert de chaleur.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000060 elementor-widget elementor-widget-image\" data-id=\"rt000060\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1774\" height=\"887\" src=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-outlet-crossover.webp\" class=\"attachment-full size-full wp-image-7378\" alt=\"\u00c9changeur de chaleur industriel avec canaux de fluide orange et bleu dans un assemblage en acier inoxydable.\" srcset=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-outlet-crossover.webp 1774w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-outlet-crossover-300x150.webp 300w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-outlet-crossover-1024x512.webp 1024w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-outlet-crossover-768x384.webp 768w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-outlet-crossover-1536x768.webp 1536w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-outlet-crossover-18x9.webp 18w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-outlet-crossover-600x300.webp 600w\" sizes=\"(max-width: 1774px) 100vw, 1774px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000061 elementor-widget elementor-widget-text-editor\" data-id=\"rt000061\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Pour un programme hypoth\u00e9tique s\u00e9par\u00e9, supposons que le liquide chaud refroidisse de 80 \u00e0 40\u00b0C tandis que le liquide froid se r\u00e9chauffe de 20 \u00e0 50\u00b0C. Les diff\u00e9rences aux extr\u00e9mit\u00e9s en contre-courant sont 80 \u2212 50 = 30 K et 40 \u2212 20 = 20 K. Les deux restent positives m\u00eame si la sortie froide est 10 K plus chaude que la sortie chaude. Des taux de capacit\u00e9 thermique compatibles et une conductance d\u2019\u00e9changeur suffisante seraient toujours n\u00e9cessaires pour r\u00e9aliser le programme.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000062 elementor-widget elementor-widget-text-editor\" data-id=\"rt000062\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>En revanche, une diff\u00e9rence de conduite locale invers\u00e9e dans le mod\u00e8le simple de chauffage suppos\u00e9 n\u00e9cessite une investigation. V\u00e9rifiez les noms des flux, l\u2019appariement des extr\u00e9mit\u00e9s, les emplacements de mesure, la direction du flux et si le mod\u00e8le suppos\u00e9 repr\u00e9sente la disposition r\u00e9elle. Quatre valeurs terminales en vrac ne peuvent pas \u00e9tablir toutes les conditions locales dans un \u00e9quipement complexe \u00e0 passages multiples ou mal distribu\u00e9.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt00009f e-con-full e-flex e-con e-parent\" data-id=\"rt00009f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000063 elementor-widget elementor-widget-heading\" data-id=\"rt000063\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"match-the-correction-method-to-the-actual-geometry\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Associez la m\u00e9thode de correction \u00e0 la g\u00e9om\u00e9trie r\u00e9elle<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000064 elementor-widget elementor-widget-text-editor\" data-id=\"rt000064\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Ne pas attribuer F = 1 \u00e0 un \u00e9changeur simplement parce que le dessin contient des fl\u00e8ches oppos\u00e9es quelque part. Une unit\u00e9 \u00e0 coque et tube avec plusieurs passes, ou une bobine d'air avec un flux crois\u00e9 et un comportement de m\u00e9lange particulier, peut n\u00e9cessiter une m\u00e9thode de correction ou un mod\u00e8le de classification plus d\u00e9taill\u00e9.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000065 elementor-widget elementor-widget-image\" data-id=\"rt000065\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-multipass-geometry.webp\" class=\"attachment-full size-full wp-image-7379\" alt=\"\u00c9changeur de chaleur industriel avec tubes en cuivre et bo\u00eetier en acier inoxydable par Domi Refrigeration.\" srcset=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-multipass-geometry.webp 1536w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-multipass-geometry-300x200.webp 300w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-multipass-geometry-1024x683.webp 1024w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-multipass-geometry-768x512.webp 768w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-multipass-geometry-18x12.webp 18w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-multipass-geometry-600x400.webp 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000066 elementor-widget elementor-widget-text-editor\" data-id=\"rt000066\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Lorsqu'une m\u00e9thode de facteur de correction s'applique, obtenir F \u00e0 partir des relations appropri\u00e9es d'agencement et de rapport de temp\u00e9rature. Demandez au fournisseur d'identifier la contre-pression de r\u00e9f\u00e9rence LMTD, la m\u00e9thode de correction, le coefficient et la base de surface. F n'est pas un multiplicateur discr\u00e9tionnaire pour faire appara\u00eetre une proposition sous-dimensionn\u00e9e comme acceptable.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000067 elementor-widget elementor-widget-text-editor\" data-id=\"rt000067\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Un programme de classification du fabricant peut incorporer la g\u00e9om\u00e9trie directement plut\u00f4t que d'exposer une seule valeur F. Demandez la base de son mod\u00e8le et les donn\u00e9es d'exploitation retourn\u00e9es au lieu d'inventer un facteur. La <a href=\"https:\/\/domirefrigeration.com\/fr\/echangeur-de-chaleur-a-faisceau-tubulaire-refrigeration-industrielle\/\"><u>guide de s\u00e9lection de l'\u00e9changeur \u00e0 coque et tube<\/u><\/a> et <a href=\"https:\/\/domirefrigeration.com\/fr\/guide-de-selection-dechangeur-de-chaleur-a-plaques\/\"><u>guide d'\u00e9changeur de chaleur \u00e0 plaques<\/u><\/a> couvre les entr\u00e9es suppl\u00e9mentaires de g\u00e9om\u00e9trie et de s\u00e9lection pour ces familles d'\u00e9quipements.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt0000a0 e-con-full e-flex e-con e-parent\" data-id=\"rt0000a0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000068 elementor-widget elementor-widget-heading\" data-id=\"rt000068\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"separate-a-condensing-zone-from-the-complete-refrigerant-circuit\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">S\u00e9parer une zone de condensation du circuit complet de r\u00e9frig\u00e9rant<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000069 elementor-widget elementor-widget-text-editor\" data-id=\"rt000069\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Une zone de condensation id\u00e9alis\u00e9e peut avoir une temp\u00e9rature de r\u00e9frig\u00e9rant approximativement constante lorsqu'un fluide pur change de phase \u00e0 une pression presque constante. Cela est compatible avec un traitement LMTD pour un mod\u00e8le de zone appropri\u00e9 ; le changement de phase ne rend pas automatiquement invalide chaque calcul LMTD.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00006a elementor-widget elementor-widget-image\" data-id=\"rt00006a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1774\" height=\"887\" src=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-phase-zones.webp\" class=\"attachment-full size-full wp-image-7380\" alt=\"Section transversale de l&#039;\u00e9changeur de chaleur de Domi Refrigeration montrant l&#039;entr\u00e9e en cuivre, les canaux de refroidissement et le m\u00e9tal.\" srcset=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-phase-zones.webp 1774w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-phase-zones-300x150.webp 300w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-phase-zones-1024x512.webp 1024w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-phase-zones-768x384.webp 768w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-phase-zones-1536x768.webp 1536w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-phase-zones-18x9.webp 18w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-phase-zones-600x300.webp 600w\" sizes=\"(max-width: 1774px) 100vw, 1774px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00006b elementor-widget elementor-widget-text-editor\" data-id=\"rt00006b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Pour une zone isotherme simplifi\u00e9e \u00e0 45\u00b0C \u00e9changeant de la chaleur avec de l'air qui se r\u00e9chauffe de 25 \u00e0 35\u00b0C, les \u00e9carts aux extr\u00e9mit\u00e9s sont de 20 et 10 K. Leur moyenne logarithmique est de 14,43 K. Cela illustre uniquement le calcul de temp\u00e9rature, pas une classification compl\u00e8te de bobine d'air.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00006c elementor-widget elementor-widget-text-editor\" data-id=\"rt00006c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Un condenseur r\u00e9el peut \u00e9galement inclure la d\u00e9superheating de vapeur, la sous-refroidissement du liquide, la perte de pression du r\u00e9frig\u00e9rant et des temp\u00e9ratures d'air in\u00e9gales. Les m\u00e9langes de r\u00e9frig\u00e9rants peuvent ajouter un glissement de temp\u00e9rature. Utilisez un mod\u00e8le qui prend en compte les zones et propri\u00e9t\u00e9s pertinentes plut\u00f4t que d'appliquer une temp\u00e9rature de saturation unique \u00e0 l'ensemble de l'assemblage sans justification.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00006d elementor-widget elementor-widget-text-editor\" data-id=\"rt00006d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Maintenez le calcul de la zone connect\u00e9 au compresseur et au point de fonctionnement du syst\u00e8me. Le <a href=\"https:\/\/domirefrigeration.com\/fr\/dimensionnement-de-serpentin-de-refrigeration-commerciale\/\"><u>guide de dimensionnement des batteries de r\u00e9frig\u00e9ration commerciale<\/u><\/a> d\u00e9crit les entr\u00e9es s\u00e9par\u00e9es de devoir, de flux d'air et de configuration dont une proposition de bobine a besoin. Un LMTD correct ne d\u00e9termine pas la charge de r\u00e9frig\u00e9rant, la capacit\u00e9 de pression ou l'approbation de l'appareil.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt0000a1 e-con-full e-flex e-con e-parent\" data-id=\"rt0000a1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00006e elementor-widget elementor-widget-heading\" data-id=\"rt00006e\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"use-an-appropriate-model-when-a-cooling-coil-is-wet\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Utilisez un mod\u00e8le appropri\u00e9 lorsqu'une bobine de refroidissement est humide<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00006f elementor-widget elementor-widget-text-editor\" data-id=\"rt00006f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Un changement de temp\u00e9rature \u00e0 l'air sec seul ne d\u00e9crit pas la charge totale c\u00f4t\u00e9 air lorsque l'humidit\u00e9 se condense sur une bobine de refroidissement. L'air perd \u00e9galement de l'\u00e9nergie latente. Un exemple de devoir sensible liquide-\u00e0-liquide ne peut pas simplement \u00eatre r\u00e9utilis\u00e9 comme m\u00e9thode de s\u00e9lection de bobine humide.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000070 elementor-widget elementor-widget-image\" data-id=\"rt000070\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-wet-coil.webp\" class=\"attachment-full size-full wp-image-7381\" alt=\"\u00c9changeur de chaleur \u00e0 bobine de Domi Refrigeration avec tubulure en cuivre et drainage d&#039;eau.\" srcset=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-wet-coil.webp 1536w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-wet-coil-300x200.webp 300w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-wet-coil-1024x683.webp 1024w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-wet-coil-768x512.webp 768w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-wet-coil-18x12.webp 18w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-wet-coil-600x400.webp 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000071 elementor-widget elementor-widget-text-editor\" data-id=\"rt000071\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Fournissez la condition d'air entrant, l'humidit\u00e9 ou une d\u00e9finition d'\u00e9tat \u00e9quivalente, le d\u00e9bit d'air, les exigences de sortie et les conditions du fluide ou du r\u00e9frig\u00e9rant. La m\u00e9thode de classification de la bobine doit tenir compte du comportement de surface humide pertinent et de l'\u00e9quilibre \u00e9nerg\u00e9tique. Un traitement bas\u00e9 sur une zone ou une enthalpie peut \u00eatre appropri\u00e9 ; demandez au fournisseur quelle m\u00e9thode il utilise et quelles hypoth\u00e8ses restent en place.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000072 elementor-widget elementor-widget-text-editor\" data-id=\"rt000072\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Identifiez \u00e9galement si le r\u00e9sultat rapport\u00e9 d\u00e9crit une bobine s\u00e8che, une bobine enti\u00e8rement humide ou une surface partiellement humide. Ce sont des conditions de classification diff\u00e9rentes. Le <a href=\"https:\/\/domirefrigeration.com\/fr\/batteries-deau-glacee\/\"><u>guide de s\u00e9lection de la bobine d'eau glac\u00e9e<\/u><\/a> fournit les entr\u00e9es relatives \u00e0 la bobine et \u00e0 l'\u00e9tat de l'air. Ne consid\u00e9rez pas un \u00e9cart positif de la borne s\u00e8che comme une preuve suffisante de la capacit\u00e9 totale de refroidissement ou de performance de d\u00e9shumidification.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt0000a2 e-con-full e-flex e-con e-parent\" data-id=\"rt0000a2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000073 elementor-widget elementor-widget-heading\" data-id=\"rt000073\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"check-the-measurements-before-rejecting-the-exchanger\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">V\u00e9rifiez les mesures avant de rejeter l'\u00e9changeur<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000074 elementor-widget elementor-widget-text-editor\" data-id=\"rt000074\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Utilisez les temp\u00e9ratures et d\u00e9bits captur\u00e9s au m\u00eame point de fonctionnement stable. Enregistrez les emplacements des capteurs, les informations de calibration ou d'incertitude, la composition du fluide et tout \u00e9change de chaleur entre le capteur et la connexion de l'\u00e9changeur.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000075 elementor-widget elementor-widget-image\" data-id=\"rt000075\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-sensor-stations.webp\" class=\"attachment-full size-full wp-image-7382\" alt=\"Syst\u00e8me de r\u00e9frig\u00e9ration industriel avec tuyauterie en cuivre et en acier inoxydable et deux pompes bleues et orange.\" srcset=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-sensor-stations.webp 1536w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-sensor-stations-300x200.webp 300w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-sensor-stations-1024x683.webp 1024w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-sensor-stations-768x512.webp 768w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-sensor-stations-18x12.webp 18w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-sensor-stations-600x400.webp 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000076 elementor-widget elementor-widget-text-editor\" data-id=\"rt000076\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Calculez les charges c\u00f4t\u00e9 chaud et froid en utilisant des propri\u00e9t\u00e9s de fluide appropri\u00e9es, puis comparez-les. Si les charges calcul\u00e9es diff\u00e8rent au-del\u00e0 de la tol\u00e9rance convenue de mesure et de perte de chaleur, examinez les donn\u00e9es avant d'inf\u00e9rer une nouvelle valeur U ou de rejeter le composant. La salissure, le bypass et le comportement de contr\u00f4le peuvent avoir leur importance, mais un enregistrement de test incoh\u00e9rent ne peut pas identifier la cause de la divergence.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000077 elementor-widget elementor-widget-text-editor\" data-id=\"rt000077\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Les petites lacunes terminales m\u00e9ritent une attention particuli\u00e8re. Supposons que chaque mesure de temp\u00e9rature ait une erreur illustr\u00e9e de \u00b10,5 K. Une diff\u00e9rence de deux lectures peut alors avoir une limite maximale de \u00b11 K. Par rapport \u00e0 une lacune terminale de 5 K, cela est cons\u00e9quent. Ce n'est pas automatiquement une incertitude de \u00b120% dans le LMTD ; calculez la sensibilit\u00e9 en utilisant \u00e0 la fois les diff\u00e9rences aux extr\u00e9mit\u00e9s et le mod\u00e8le de mesure r\u00e9el.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000078 elementor-widget elementor-widget-text-editor\" data-id=\"rt000078\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Conservez les lectures brutes et la m\u00e9thode de traitement avec le r\u00e9sultat du test. \u00c9vitez de remplacer silencieusement une mesure difficile par une valeur du catalogue. Un fournisseur doit pouvoir reproduire l'association de temp\u00e9rature, l'\u00e9quilibre thermique et le mod\u00e8le utilis\u00e9 pour accepter la pi\u00e8ce.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt0000a3 e-con-full e-flex e-con e-parent\" data-id=\"rt0000a3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000079 elementor-widget elementor-widget-heading\" data-id=\"rt000079\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"request-a-rating-record-that-another-engineer-can-reproduce\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Demandez un enregistrement de classification que un autre ing\u00e9nieur peut reproduire<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00007a elementor-widget elementor-widget-text-editor\" data-id=\"rt00007a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Commencez l'enqu\u00eate avec le programme de fonctionnement requis. Une seule valeur de LMTD ne donne pas au fournisseur les temp\u00e9ratures et conditions de d\u00e9bit qui la sous-tendent. Incluez l'agencement du flux et les contraintes que l'\u00e9quipement propos\u00e9 doit satisfaire.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00007b elementor-widget elementor-widget-image\" data-id=\"rt00007b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-rating-dossier.webp\" class=\"attachment-full size-full wp-image-7383\" alt=\"Composants de l&#039;\u00e9changeur de chaleur \u00e0 bobine de Domi Refrigeration et sch\u00e9ma pour le syst\u00e8me CVC.\" srcset=\"https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-rating-dossier.webp 1536w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-rating-dossier-300x200.webp 300w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-rating-dossier-1024x683.webp 1024w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-rating-dossier-768x512.webp 768w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-rating-dossier-18x12.webp 18w, https:\/\/domirefrigeration.com\/wp-content\/uploads\/2026\/10\/log-mean-temperature-difference-rating-dossier-600x400.webp 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00007c elementor-widget elementor-widget-text-editor\" data-id=\"rt00007c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Envoyez les identit\u00e9s et concentrations des fluides, quatre cibles de temp\u00e9rature terminale lorsque connues, d\u00e9bits, charge, pressions de fonctionnement et pertes de pression admissibles. Ajoutez l'enveloppe de l'\u00e9quipement, les contraintes de connexion, les hypoth\u00e8ses de salissure ou de nettoyage et la plage de fonctionnement pr\u00e9vue. Identifiez les sorties inconnues au lieu de les remplir avec des valeurs devin\u00e9es.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00007d elementor-widget elementor-widget-text-editor\" data-id=\"rt00007d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Demandez un dessin retourn\u00e9 et une fiche de classification qui identifient le sch\u00e9ma d'\u00e9coulement, la m\u00e9thode de calcul, la base de surface, le coefficient ou la conductance, les pertes de pression et tout traitement de zone ou correction. S\u00e9parez les valeurs pr\u00e9dites des mesures et enregistrez la r\u00e9vision de la g\u00e9om\u00e9trie associ\u00e9e \u00e0 chaque r\u00e9sultat.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00007e elementor-widget elementor-widget-text-editor\" data-id=\"rt00007e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Si une proposition ne r\u00e9pond \u00e0 la charge qu'apr\u00e8s avoir modifi\u00e9 le programme de temp\u00e9rature, traitez-la comme un cas de fonctionnement alternatif. Comparez les cons\u00e9quences pour le syst\u00e8me environnant avant de l'approuver. Un \u00e9changeur qui transf\u00e8re la chaleur requise dans des conditions d'entr\u00e9e ou de sortie diff\u00e9rentes a r\u00e9pondu \u00e0 une sp\u00e9cification diff\u00e9rente.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt0000a4 e-con-full e-flex e-con e-parent\" data-id=\"rt0000a4\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00007f elementor-widget elementor-widget-heading\" data-id=\"rt00007f\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"frequently-asked-questions\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Questions fr\u00e9quemment pos\u00e9es<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000080 elementor-widget elementor-widget-heading\" data-id=\"rt000080\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"what-does-log-mean-temperature-difference-tell-you\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Que vous dit la diff\u00e9rence logarithmique moyenne de temp\u00e9rature ?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000081 elementor-widget elementor-widget-text-editor\" data-id=\"rt000081\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Elle d\u00e9crit la force motrice effective de la temp\u00e9rature dans le mod\u00e8le d'\u00e9changeur de chaleur s\u00e9lectionn\u00e9. Combin\u00e9e avec la conductance appropri\u00e9e et toute correction n\u00e9cessaire, elle supporte un calcul de transfert de chaleur. Elle ne fournit pas en elle-m\u00eame la capacit\u00e9, l'efficacit\u00e9 ou une s\u00e9lection compl\u00e8te de l'\u00e9quipement.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000082 elementor-widget elementor-widget-heading\" data-id=\"rt000082\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"what-is-the-unit-of-log-mean-temperature-difference\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Quelle est l'unit\u00e9 de la diff\u00e9rence logarithmique moyenne de temp\u00e9rature ?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000083 elementor-widget elementor-widget-text-editor\" data-id=\"rt000083\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Utilisez une unit\u00e9 de diff\u00e9rence de temp\u00e9rature telle que K, diff\u00e9rence en \u00b0C ou diff\u00e9rence en \u00b0F. Les diff\u00e9rences Celsius et Kelvin ont la m\u00eame valeur num\u00e9rique. Les diff\u00e9rences Fahrenheit n\u00e9cessitent une conversion lorsqu'elles sont utilis\u00e9es avec un coefficient exprim\u00e9 par Kelvin. Maintenez coh\u00e9rents \u00e0 la fois les diff\u00e9rences d'entr\u00e9e et les unit\u00e9s de classification.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000084 elementor-widget elementor-widget-heading\" data-id=\"rt000084\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"what-happens-when-the-two-terminal-differences-are-equal\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Que se passe-t-il lorsque les deux diff\u00e9rences terminales sont \u00e9gales ?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000085 elementor-widget elementor-widget-text-editor\" data-id=\"rt000085\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Pour des diff\u00e9rences positives \u00e9gales, le LMTD est \u00e9gal \u00e0 cette diff\u00e9rence commune. Utilisez la valeur limite plut\u00f4t que d'\u00e9valuer litt\u00e9ralement 0\/0. Une erreur dans une feuille de calcul dans ce cas ne signifie pas que l'\u00e9changeur a une force motrice nulle.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000086 elementor-widget elementor-widget-heading\" data-id=\"rt000086\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"why-not-use-the-arithmetic-mean-temperature-difference\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Pourquoi ne pas utiliser la diff\u00e9rence de temp\u00e9rature moyenne arithm\u00e9tique ?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000087 elementor-widget elementor-widget-text-editor\" data-id=\"rt000087\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Elle peut s'\u00e9carter consid\u00e9rablement de la moyenne logarithmique lorsque les lacunes aux extr\u00e9mit\u00e9s diff\u00e8rent fortement. V\u00e9rifiez l'erreur pour le programme de temp\u00e9rature r\u00e9el. Dans le cas de flux parall\u00e8le travaill\u00e9, substituer 32,50 K \u00e0 22,13 K sous-estime de mani\u00e8re significative la conductance requise.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000088 elementor-widget elementor-widget-heading\" data-id=\"rt000088\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"is-a-higher-lmtd-always-better\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Un LMTD plus \u00e9lev\u00e9 est-il toujours meilleur ?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000089 elementor-widget elementor-widget-text-editor\" data-id=\"rt000089\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Non. Sur la base d'une charge et d'une correction d\u00e9clar\u00e9es, une diff\u00e9rence de force motrice plus grande r\u00e9duit le UA requis. Mais un LMTD plus petit peut r\u00e9sulter d'une approche de temp\u00e9rature d\u00e9lib\u00e9r\u00e9ment proche ou d'une autre exigence du processus. \u00c9valuez ensemble le programme de temp\u00e9rature requis, la consommation d'\u00e9nergie, la conductance et les pertes de pression.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00008a elementor-widget elementor-widget-heading\" data-id=\"rt00008a\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"can-the-cold-outlet-be-hotter-than-the-hot-outlet\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Le point de sortie froid peut-il \u00eatre plus chaud que le point de sortie chaud ?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00008b elementor-widget elementor-widget-text-editor\" data-id=\"rt00008b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>En contre-courant, cela peut l'\u00eatre, car les sorties sont aux extr\u00e9mit\u00e9s physiques diff\u00e9rentes. V\u00e9rifiez les paires d'extr\u00e9mit\u00e9s r\u00e9elles et l'\u00e9quilibre thermique. Cela ne permet pas une inversion locale arbitraire de la force motrice de la temp\u00e9rature dans un mod\u00e8le simple suppos\u00e9.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00008c elementor-widget elementor-widget-heading\" data-id=\"rt00008c\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"can-lmtd-be-used-for-condensers-and-evaporators\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Le LMTD peut-il \u00eatre utilis\u00e9 pour les condensateurs et les \u00e9vaporateurs ?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00008d elementor-widget elementor-widget-text-editor\" data-id=\"rt00008d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Il peut \u00eatre utile pour des mod\u00e8les appropri\u00e9s de zones de changement de phase. V\u00e9rifiez la perte de pression, le glissement de temp\u00e9rature, les r\u00e9gions de surchauffe ou de sous-refroidissement, ainsi que le comportement de l'air ou du fluide secondaire. Un enroulement de r\u00e9frig\u00e9rant complet peut n\u00e9cessiter une \u00e9valuation plus d\u00e9taill\u00e9e qu'un simple calcul de temp\u00e9rature terminale globale.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00008e elementor-widget elementor-widget-heading\" data-id=\"rt00008e\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"should-i-use-lmtd-or-the-effectiveness-ntu-method\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Dois-je utiliser le LMTD ou la m\u00e9thode d'efficacit\u00e9-NTU ?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt00008f elementor-widget elementor-widget-text-editor\" data-id=\"rt00008f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Le LMTD est pratique lorsque les temp\u00e9ratures terminales pertinentes sont connues ou sp\u00e9cifi\u00e9es et que la configuration peut \u00eatre repr\u00e9sent\u00e9e de mani\u00e8re appropri\u00e9e. Lorsque les sorties sont inconnues, une approche d'efficacit\u00e9-NTU ou une \u00e9valuation d\u00e9taill\u00e9e peut \u00eatre plus pratique. La m\u00e9thode n\u00e9cessite toujours la g\u00e9om\u00e9trie correcte, les propri\u00e9t\u00e9s et les hypoth\u00e8ses d'exploitation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt0000a5 e-con-full e-flex e-con e-parent\" data-id=\"rt0000a5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000090 elementor-widget elementor-widget-heading\" data-id=\"rt000090\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"turn-the-temperature-program-into-a-reviewable-coil-requirement\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Transformez le programme de temp\u00e9rature en une exigence de bobine v\u00e9rifiable<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000091 elementor-widget elementor-widget-text-editor\" data-id=\"rt000091\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Conservez ensemble les quatre temp\u00e9ratures, leurs emplacements et le sch\u00e9ma d'\u00e9coulement. Confirmez l'\u00e9quilibre \u00e9nerg\u00e9tique et les limites du mod\u00e8le avant d'utiliser le LMTD calcul\u00e9 pour d\u00e9duire UA ou la surface. Cet enregistrement permet \u00e0 l'achat de comparer les propositions thermiques sans consid\u00e9rer un seul r\u00e9sultat de formule comme preuve d'une conception compl\u00e8te.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000092 elementor-widget elementor-widget-text-editor\" data-id=\"rt000092\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>La page des <a href=\"https:\/\/domirefrigeration.com\/fr\/fabrication-de-batteries-sur-mesure\/\"><u>service de fabrication de serpentins personnalis\u00e9s<\/u><\/a> fournit une destination pour les demandes de dessin et d'exigences d'exploitation. Envoyez le programme de temp\u00e9rature, l'identit\u00e9 du fluide ou du r\u00e9frig\u00e9rant, la charge, les informations sur l'\u00e9coulement et les pertes de pression admissibles avec l'enveloppe disponible et le dessin de raccordement.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000093 elementor-widget elementor-widget-text-editor\" data-id=\"rt000093\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Indiquez si le projet concerne une bobine \u00e0 liquide sec, une bobine de refroidissement humide ou une autre construction d'\u00e9changeur de chaleur propos\u00e9e. Incluez la plage de fonctionnement et indiquez quels r\u00e9sultats sont n\u00e9cessaires \u00e0 partir du calcul, des tests de prototype ou d'une r\u00e9f\u00e9rence existante approuv\u00e9e. Domi peut \u00e9valuer les informations du projet fourni ; le mod\u00e8le sp\u00e9cifique, les preuves de performance, la port\u00e9e des tests, la quantit\u00e9 et le d\u00e9lai de livraison n\u00e9cessitent une confirmation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000094 elementor-align-left elementor-widget elementor-widget-button\" data-id=\"rt000094\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-md\" href=\"https:\/\/domirefrigeration.com\/fr\/contact\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Envoyez votre programme de temp\u00e9rature pour revue<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-rt0000a6 e-con-full e-flex e-con e-parent\" data-id=\"rt0000a6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000095 elementor-widget elementor-widget-heading\" data-id=\"rt000095\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"related-refrigeration-resources\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Related refrigeration resources<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-rt000096 elementor-widget elementor-widget-text-editor\" data-id=\"rt000096\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul>\n<li><a href=\"https:\/\/domirefrigeration.com\/fr\/coefficient-de-transfert-de-chaleur\/\"><u>Coefficient de transfert de chaleur, U et UA expliqu\u00e9s<\/u><\/a><\/li>\n<li><a href=\"https:\/\/domirefrigeration.com\/fr\/guide-de-selection-dechangeur-de-chaleur-a-plaques\/\"><u>S\u00e9lection et saisie des param\u00e8tres pour l'\u00e9changeur de chaleur \u00e0 plaques<\/u><\/a><\/li>\n<li><a href=\"https:\/\/domirefrigeration.com\/fr\/batteries-deau-glacee\/\"><u>Bobines d'eau glac\u00e9e et exigences d'\u00e9tat de l'air<\/u><\/a><\/li>\n<li><a href=\"https:\/\/domirefrigeration.com\/fr\/dimensionnement-de-serpentin-de-refrigeration-commerciale\/\"><u>Param\u00e8tres de dimensionnement des serpentins pour la r\u00e9frig\u00e9ration commerciale<\/u><\/a><\/li>\n<li><a href=\"https:\/\/domirefrigeration.com\/fr\/echangeur-de-chaleur-a-faisceau-tubulaire-refrigeration-industrielle\/\"><u>S\u00e9lection d'un \u00e9changeur de chaleur \u00e0 coque et tube<\/u><\/a><\/li>\n<li><a href=\"https:\/\/domirefrigeration.com\/fr\/fabrication-de-batteries-sur-mesure\/\"><u>Fabrication de bobines sur mesure et revue de projet<\/u><\/a><\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Apprenez la formule LMTD, le jumelage de temp\u00e9rature terminale, les calculs d\u00e9taill\u00e9s et les limites importantes lors de l'examen des propositions d'\u00e9changeurs de chaleur et de serpentins.<\/p>","protected":false},"author":1,"featured_media":7371,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[54],"tags":[],"class_list":["post-7384","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oem-buyer-guides"],"_links":{"self":[{"href":"https:\/\/domirefrigeration.com\/fr\/wp-json\/wp\/v2\/posts\/7384","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/domirefrigeration.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/domirefrigeration.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/domirefrigeration.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/domirefrigeration.com\/fr\/wp-json\/wp\/v2\/comments?post=7384"}],"version-history":[{"count":3,"href":"https:\/\/domirefrigeration.com\/fr\/wp-json\/wp\/v2\/posts\/7384\/revisions"}],"predecessor-version":[{"id":7387,"href":"https:\/\/domirefrigeration.com\/fr\/wp-json\/wp\/v2\/posts\/7384\/revisions\/7387"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/domirefrigeration.com\/fr\/wp-json\/wp\/v2\/media\/7371"}],"wp:attachment":[{"href":"https:\/\/domirefrigeration.com\/fr\/wp-json\/wp\/v2\/media?parent=7384"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/domirefrigeration.com\/fr\/wp-json\/wp\/v2\/categories?post=7384"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/domirefrigeration.com\/fr\/wp-json\/wp\/v2\/tags?post=7384"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}