{"id":4691,"date":"2026-09-20T18:14:06","date_gmt":"2026-09-21T01:14:06","guid":{"rendered":"https:\/\/www.26yc.com\/psychrometric-processes-heat-recovery\/"},"modified":"2026-10-08T23:36:09","modified_gmt":"2026-10-09T06:36:09","slug":"psychrometric-processes-heat-recovery","status":"publish","type":"post","link":"https:\/\/www.26yc.com\/ja\/psychrometric-processes-heat-recovery\/","title":{"rendered":"Psychrometric Processes in Heat Recovery: What Happens on the Chart"},"content":{"rendered":"<h2>Four basic processes<\/h2>\n<p>On the psychrometric chart, ventilation air moves along predictable lines:<\/p>\n<ul>\n<li><strong>Heating<\/strong>: horizontal line to the right (dry-bulb up, moisture constant).<\/li>\n<li><strong>Sensible cooling<\/strong>: horizontal line to the left (dry-bulb down, moisture constant).<\/li>\n<li><strong>Humidification<\/strong>: line upward (more moisture).<\/li>\n<li><strong>Dehumidification<\/strong>: line downward (condensation, latent heat released).<\/li>\n<\/ul>\n<h2>Sensible recovery = a move along the constant-humidity line<\/h2>\n<p>A <a href=\"\/ja\/plate-heat-exchanger\/\">\u30d7\u30ec\u30fc\u30c8\u30b3\u30a2<\/a> pre-heats or pre-cools the supply along a constant-humidity path: dry-bulb temperature changes, moisture does not. It is the simplest, cleanest recovery for separated airstreams.<\/p>\n<h2>Total-energy recovery = a move toward the exhaust state<\/h2>\n<p>A <a href=\"\/ja\/rotary-heat-recovery-wheel\/\">rotary enthalpy wheel<\/a> or membrane pulls the supply state toward the exhaust state in both temperature and humidity. In winter, cold dry outdoor air approaches the warmer, more humid exhaust &#8211; picking up sensible and latent energy and cutting both heating and humidification load.<\/p>\n<h2>Where frost enters the picture<\/h2>\n<p>When exhaust falls below its <a href=\"\/ja\/dew-point-and-frost-point\/\">dew point and frost point<\/a>, moisture deposits as ice on the core. This is why cold-climate designs need defrost strategy, not just a bigger wheel.<\/p>\n<h2>Frequently asked questions<\/h2>\n<p><strong>Does recovery change indoor RH?<\/strong> Sensible-only recovery does not; total-energy recovery can steady indoor humidity because it transfers moisture too.<\/p>\n<p><strong>Which process saves more energy in summer?<\/strong> In humid summers, the dehumidification (downward) leg of total recovery relieves the cooling coil most.<\/p>\n<p>Need help specifying the right air-to-air heat recovery for your project? <a href=\"\/ja\/contact-us\/\">Contact the QIYU engineering team<\/a> &#8211; WhatsApp +86 157 5335 5505, or email kuns913@gmail.com.<\/p>\n<p class=\"yc-faq-title\"><strong>\u3088\u304f\u3042\u308b\u8cea\u554f<\/strong><\/p>\n<div class=\"yc-faq\">\n<h3>How does a heat recovery process appear on the chart?<\/h3>\n<p>Sensible recovery moves a state horizontally (temperature change, same moisture); enthalpy recovery moves it along a line blending both temperature and moisture toward the supply state.<\/p>\n<\/div>\n<div class=\"yc-faq\">\n<h3>Why do cooling and recovery processes often combine on the chart?<\/h3>\n<p>Precooling the exhaust with incoming air lowers the wet-bulb the cooling coil must handle, shrinking coil load and sometimes letting a smaller coil meet the setpoint.<\/p>\n<\/div>\n<div class=\"yc-related\">\n<h3>\u95a2\u9023\u8a18\u4e8b<\/h3>\n<ul>\n<li><a href=\"https:\/\/www.26yc.com\/ja\/air-leakage-cross-contamination\/\" title=\"Air Leakage and Cross-Contamination: Why Separated Cores Win for Dirty Air\">Air Leakage and Cross-Contamination: Why Separated Cores Win for Dirty Air<\/a><\/li>\n<li><a href=\"https:\/\/www.26yc.com\/ja\/cold-chain-heat-recovery-case\/\" title=\"\u30b3\u30fc\u30eb\u30c9\u30c1\u30a7\u30fc\u30f3\u71b1\u56de\u53ce\u4e8b\u4f8b\u7814\u7a76\">\u30b3\u30fc\u30eb\u30c9\u30c1\u30a7\u30fc\u30f3\u71b1\u56de\u53ce\u4e8b\u4f8b\u7814\u7a76<\/a><\/li>\n<\/ul>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Four basic processes On the psychrometric chart, ventilation air moves along predictable lines: Heating: horizontal line to the right (dry-bulb up, moisture constant). Sensible cooling: horizontal line to the left (dry-bulb down, moisture constant). Humidification: line upward (more moisture). Dehumidification: line downward (condensation, latent heat released). Sensible recovery = a move along the constant-humidity line [&hellip;]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[243,197],"tags":[279,182,162,199,278],"class_list":["post-4691","post","type-post","status-publish","format-standard","hentry","category-design-calc","category-encyclopedia","tag-cooling-coil","tag-energy-recovery","tag-heat-recovery","tag-hvac","tag-psychrometric-process"],"_links":{"self":[{"href":"https:\/\/www.26yc.com\/ja\/wp-json\/wp\/v2\/posts\/4691","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.26yc.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.26yc.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/www.26yc.com\/ja\/wp-json\/wp\/v2\/comments?post=4691"}],"version-history":[{"count":1,"href":"https:\/\/www.26yc.com\/ja\/wp-json\/wp\/v2\/posts\/4691\/revisions"}],"predecessor-version":[{"id":5112,"href":"https:\/\/www.26yc.com\/ja\/wp-json\/wp\/v2\/posts\/4691\/revisions\/5112"}],"wp:attachment":[{"href":"https:\/\/www.26yc.com\/ja\/wp-json\/wp\/v2\/media?parent=4691"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.26yc.com\/ja\/wp-json\/wp\/v2\/categories?post=4691"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.26yc.com\/ja\/wp-json\/wp\/v2\/tags?post=4691"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}