{"id":4604,"date":"2026-09-10T19:27:29","date_gmt":"2026-09-11T02:27:29","guid":{"rendered":"https:\/\/www.26yc.com\/heat-exchanger-pressure-drop\/"},"modified":"2026-10-08T23:36:09","modified_gmt":"2026-10-09T06:36:09","slug":"heat-exchanger-pressure-drop","status":"publish","type":"post","link":"https:\/\/www.26yc.com\/fr\/heat-exchanger-pressure-drop\/","title":{"rendered":"Perte de charge et \u00e9nergie de ventilateur des \u00e9changeurs"},"content":{"rendered":"<p>A heat exchanger only saves energy if the recovered heat exceeds the extra electricity needed to push air through it. That trade-off is governed by <strong>Perte de charge<\/strong>.<\/p>\n<h2>What Drives Pressure Drop?<\/h2>\n<ul>\n<li>Face velocity (higher speed = steeper rise)<\/li>\n<li>Core depth and plate count<\/li>\n<li>Surface corrugation and coating thickness<\/li>\n<li>Dust or fiber loading on fins<\/li>\n<\/ul>\n<h2>Reading a Performance Curve<\/h2>\n<p>Manufacturers publish pressure drop vs airflow. A good design operates on the flatter part of the curve \u2014 typically 2\u20133 m\/s face velocity for plates. Beyond that, fan power rises faster than recovered heat.<\/p>\n<h2>Calculating Net Savings<\/h2>\n<p>Net savings = recovered thermal energy \u2212 extra fan energy. As a rule of thumb, keep added pressure drop under 100\u2013150 Pa for ventilation applications unless efficiency gains are large.<\/p>\n<h2>Design Tips<\/h2>\n<ul>\n<li>Use EC plug fans to capture part-load efficiency.<\/li>\n<li>Add pre-filters to keep the core clean.<\/li>\n<li>Provide access for periodic cleaning.<\/li>\n<li>Model the full year, not just design day.<\/li>\n<\/ul>\n<p>Put pressure drop next to recovered energy early in the selection, not after. Apply the fan affinity laws when forecasting part-load savings: halving flow roughly quarters the fan power, so variable-speed control pays back fast on duty with wide load swings. Track specific fan power, the watts per cubic meter per second of air moved, as a single figure of merit across competing cores. Use the published performance curve rather than a single point, and model the annual load profile so the design sits on the efficient part of the curve for most hours. Pre-filtration and a cleaning plan protect that position over time. Our <a href=\"https:\/\/www.26yc.com\/fr\/ntu-effectiveness-method\/\">performance methodology<\/a> explains how effectiveness and pressure drop trade off in practice.<\/p>\n<h2>Questions fr\u00e9quemment pos\u00e9es<\/h2>\n<p><strong>Is a bigger core always better?<\/strong><br \/>\nNot always. A deeper core raises efficiency but also pressure drop; optimize the combination.<\/p>\n<p><strong>How often should I clean?<\/strong><br \/>\nInspect quarterly in dusty duty; clean when pressure drop rises 15\u201320 % above baseline.<\/p>\n<div class=\"yc-related\">\n<h3>Articles connexes<\/h3>\n<ul>\n<li><a href=\"https:\/\/www.26yc.com\/fr\/psychrometric-processes-heat-recovery\/\">Psychrometric Processes in Heat Recovery: What Happens on the Chart<\/a><\/li>\n<li><a href=\"https:\/\/www.26yc.com\/fr\/ntu-effectiveness-method\/\">The epsilon-NTU Method: Predicting Heat Exchanger Performance<\/a><\/li>\n<li><a href=\"https:\/\/www.26yc.com\/fr\/dew-point-and-frost-point\/\">Dew Point and Frost Point: The Temperatures That Decide Core Survival<\/a><\/li>\n<li><a href=\"https:\/\/www.26yc.com\/fr\/brazed-vs-gasketed-plate-heat-exchangers\/\" title=\"Brazed Plate vs Gasketed Plate Heat Exchangers\">Brazed Plate vs Gasketed Plate Heat Exchangers<\/a><\/li>\n<\/ul>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>A heat exchanger only saves energy if the recovered heat exceeds the extra electricity needed to push air through it. That trade-off is governed by pressure drop. What Drives Pressure Drop? Face velocity (higher speed = steeper rise) Core depth and plate count Surface corrugation and coating thickness Dust or fiber loading on fins Reading [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[243,197],"tags":[223,222],"class_list":["post-4604","post","type-post","status-publish","format-standard","hentry","category-design-calc","category-encyclopedia","tag-fan-energy","tag-pressure-drop"],"_links":{"self":[{"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/posts\/4604","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/comments?post=4604"}],"version-history":[{"count":3,"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/posts\/4604\/revisions"}],"predecessor-version":[{"id":5157,"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/posts\/4604\/revisions\/5157"}],"wp:attachment":[{"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/media?parent=4604"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/categories?post=4604"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/tags?post=4604"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}