{"id":5354,"date":"2026-11-06T00:35:41","date_gmt":"2026-11-06T08:35:41","guid":{"rendered":"https:\/\/www.26yc.com\/tools\/standards-glossary\/"},"modified":"2026-11-06T00:35:41","modified_gmt":"2026-11-06T08:35:41","slug":"standards-glossary","status":"publish","type":"page","link":"https:\/\/www.26yc.com\/fr\/tools\/standards-glossary\/","title":{"rendered":"Heat Recovery Standards &#038; Glossary"},"content":{"rendered":"<p>A quick reference for the standards and terms that appear in heat-recovery specifications: EN 308, AHRI 1060, ASHRAE 84, EN 16798 and GB\/T 21087, the effectiveness and leakage definitions, and the formulas used to convert test data into a duty point. Keep it open while reading a manufacturer datasheet or writing a ventilation specification.<\/p>\n<style>\r\n.yc-tp-standards-glossary{font-family:-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:#222;line-height:1.6;--ink:#1a3c5e;--accent:#0f6e56;--bg:#f5f8fa;--card:#fff;--line:#dce4ea;--muted:#5f6b75}\r\n.yc-tp-standards-glossary h1{color:var(--ink);font-size:27px;margin:8px 0 6px;line-height:1.25}\r\n.yc-tp-standards-glossary .lead{color:var(--muted);margin:0 0 22px;font-size:16px}\r\n.yc-tp-standards-glossary .card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;margin-bottom:16px}\r\n.yc-tp-standards-glossary .card h2{font-size:16px;margin:0 0 12px;color:var(--accent);text-transform:uppercase;letter-spacing:.04em}\r\n.yc-tp-standards-glossary table.std{width:100%;border-collapse:collapse;font-size:13.5px}\r\n.yc-tp-standards-glossary table.std th, .yc-tp-standards-glossary table.std td{border:1px solid var(--line);padding:9px 10px;vertical-align:top;text-align:left}\r\n.yc-tp-standards-glossary table.std thead th{background:var(--ink);color:#fff}\r\n.yc-tp-standards-glossary table.std tbody th{background:#eef3f7;color:var(--ink);white-space:nowrap}\r\n.yc-tp-standards-glossary .formula{background:#0f2438;color:#d6e6f2;border-radius:8px;padding:12px 14px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13.5px;margin:8px 0}\r\n.yc-tp-standards-glossary .formula b{color:#7fd1b5}\r\n.yc-tp-standards-glossary .gloss{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px}\r\n.yc-tp-standards-glossary .g{background:#fff;border:1px solid var(--line);border-radius:10px;padding:13px 14px}\r\n.yc-tp-standards-glossary .g dt{font-weight:700;color:var(--ink);font-size:14.5px;margin-bottom:4px}\r\n.yc-tp-standards-glossary .g dd{margin:0;font-size:13px;color:var(--muted)}\r\n.yc-tp-standards-glossary .cta{margin-top:8px;background:#eaf3ef;border:1px solid #bfe0d2;border-radius:12px;padding:18px}\r\n.yc-tp-standards-glossary .cta h2{margin:0 0 8px;color:var(--ink);font-size:18px}\r\n.yc-tp-standards-glossary .cta a.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;padding:10px 16px;border-radius:8px;font-weight:500;margin-top:8px}\r\n.yc-tp-standards-glossary .cta .phone{font-weight:600;color:var(--ink)}\r\n.yc-tp-standards-glossary .links{margin-top:14px;font-size:13px;color:var(--muted)}\r\n.yc-tp-standards-glossary .links a{color:var(--accent);text-decoration:none}\r\n@media(max-width:640px){.yc-tp-standards-glossary table.std{font-size:12px}\r\n.yc-tp-standards-glossary table.std th, .yc-tp-standards-glossary table.std td{padding:6px 6px}}\r\n<\/style>\r\n<div class=\"yc-tp yc-tp-standards-glossary\">\r\n\r\n  \r\n  <p class=\"lead\">The reference sheet engineers reach for: the standards that define performance, the formulas behind every sizing, and the terms you see on a datasheet.<\/p>\r\n\r\n  <div class=\"card\">\r\n    <h2>Standards quick-reference<\/h2>\r\n    <table class=\"std\">\r\n      <thead><tr><th>Norme<\/th><th>P\u00e9rim\u00e8tre<\/th><th>What it defines<\/th><\/tr><\/thead>\r\n      <tbody>\r\n        <tr><th>EN 308<\/th><td>EU test method for air-to-air heat recovery devices<\/td><td>Sensible &amp; total heat-transfer rate and effectiveness test setup and procedure.<\/td><\/tr>\r\n        <tr><th>AHRI 1060<\/th><td>Performance rating of air-to-air exchangers for ERV\/HRV equipment<\/td><td>Sensible, latent and enthalpy effectiveness ratings at rated conditions.<\/td><\/tr>\r\n        <tr><th>ASHRAE Std 84<\/th><td>Method of testing air-to-air heat exchangers<\/td><td>Laboratory procedure for sensible and total effectiveness.<\/td><\/tr>\r\n        <tr><th>EN 13141-4<\/th><td>Residential ventilation components \u2014 performance testing<\/td><td>Field\/lab test of heat-recovery ventilation units including effectiveness.<\/td><\/tr>\r\n        <tr><th>Eurovent 6\/11<\/th><td>European certification of air handling &amp; heat-recovery units<\/td><td>Voluntary performance certification and energy labelling.<\/td><\/tr>\r\n        <tr><th>EN 16798 \/ EPBD<\/th><td>Building energy performance \u2014 ventilation requirements<\/td><td>Indoor environment and energy criteria that drive recovery specifications.<\/td><\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <div class=\"card\">\r\n    <h2>Formulas engineers use<\/h2>\r\n    <div class=\"formula\"><b>Efficacit\u00e9 sensible<\/b> &nbsp; &epsilon;<sub>s<\/sub> = (T<sub>supply,out<\/sub> &minus; T<sub>ext\u00e9rieur<\/sub>) \/ (T<sub>indoor<\/sub> &minus; T<sub>ext\u00e9rieur<\/sub>)<\/div>\r\n    <div class=\"formula\"><b>Total \/ enthalpy effectiveness<\/b> &nbsp; &epsilon;<sub>t<\/sub> = (h<sub>supply,out<\/sub> &minus; h<sub>ext\u00e9rieur<\/sub>) \/ (h<sub>indoor<\/sub> &minus; h<sub>ext\u00e9rieur<\/sub>)<\/div>\r\n    <div class=\"formula\"><b>Recovered heating power<\/b> &nbsp; Q = &rho; &middot; V&#775; &middot; c<sub>p<\/sub> &middot; &Delta;T &nbsp; (&rho;=1.2 kg\/m&sup3;, c<sub>p<\/sub>=1.006 kJ\/kg&middot;K)<\/div>\r\n    <div class=\"formula\"><b>Dew point (Magnus)<\/b> &nbsp; &alpha; = ln(RH\/100) + 17.625&middot;T\/(243.04+T) ; &nbsp; T<sub>d<\/sub> = 243.04&middot;&alpha;\/(17.625 &minus; &alpha;)<\/div>\r\n    <p class=\"links\">Run the numbers: <a href=\"https:\/\/www.26yc.com\/fr\/tools\/unit-converter\/\">Unit converter<\/a> &middot; <a href=\"https:\/\/www.26yc.com\/fr\/tools\/frost-estimator\/\">Frost estimator<\/a><\/p>\r\n  <\/div>\r\n\r\n  <div class=\"card\">\r\n    <h2>Glossary<\/h2>\r\n    <dl class=\"gloss\">\r\n      <div class=\"g\"><dt>Efficacit\u00e9 sensible<\/dt><dd>Fraction of the temperature difference recovered; heat only, no moisture transfer.<\/dd><\/div>\r\n      <div class=\"g\"><dt>Total \/ enthalpy effectiveness<\/dt><dd>Fraction of the enthalpy (heat + moisture) difference recovered; defines ERV performance.<\/dd><\/div>\r\n      <div class=\"g\"><dt>Rotary wheel<\/dt><dd>Revolving thermal mass that transfers heat (and moisture, if enthalpy) between streams; highest effectiveness, small carry-over.<\/dd><\/div>\r\n      <div class=\"g\"><dt>Plate core<\/dt><dd>Fixed stack of plates. Counter-flow reaches higher effectiveness than cross-flow; streams stay fully separated.<\/dd><\/div>\r\n      <div class=\"g\"><dt>Caloduc<\/dt><dd>Sealed pipe with phase-change fluid; passive, no motor, compact and freeze-tolerant.<\/dd><\/div>\r\n      <div class=\"g\"><dt>Boucle \u00e0 pompe de circulation<\/dt><dd>Two coils linked by a circulating fluid; separates streams by distance with no air mixing.<\/dd><\/div>\r\n      <div class=\"g\"><dt>Dew point<\/dt><dd>Temperature at which air condenses moisture; below it, surfaces wet or (if &lt;0&deg;C) frost.<\/dd><\/div>\r\n      <div class=\"g\"><dt>Frost \/ defrost<\/dt><dd>Ice forming on the cold side in winter; managed by preheat, bypass or frost-tolerant cores.<\/dd><\/div>\r\n      <div class=\"g\"><dt>Bypass<\/dt><dd>Damper route that lets air skip the core in mild weather or during defrost.<\/dd><\/div>\r\n      <div class=\"g\"><dt>NTU<\/dt><dd>Number of transfer units \u2014 dimensionless size of the exchanger; higher NTU means higher effectiveness.<\/dd><\/div>\r\n      <div class=\"g\"><dt>Face velocity<\/dt><dd>Air speed through the core face; higher speeds cut size but raise pressure drop.<\/dd><\/div>\r\n      <div class=\"g\"><dt>Pressure drop<\/dt><dd>Fan energy needed to push air through the core; trades off against effectiveness.<\/dd><\/div>\r\n      <div class=\"g\"><dt>ERV vs HRV<\/dt><dd>HRV = heat only; ERV = heat + moisture. ERV controls humidity load, HRV avoids moisture transfer.<\/dd><\/div>\r\n      <div class=\"g\"><dt>Contamination crois\u00e9e<\/dt><dd>Exhaust leaking into supply; eliminated by separated cores (plate, heat pipe, run-around).<\/dd><\/div>\r\n      <div class=\"g\"><dt>Balanced flow<\/dt><dd>Equal supply and exhaust airflow; unbalanced designs recover on the lower flow.<\/dd><\/div>\r\n    <\/dl>\r\n  <\/div>\r\n\r\n  <section class=\"cta\">\r\n    <h2>Translating specs into a build?<\/h2>\r\n    <p>Send your duty \u2014 airflow, temperatures, humidity and exhaust description \u2014 and we will match a core to EN 308 \/ AHRI 1060 and your pressure budget.<\/p>\r\n    <p class=\"phone\">Call: 15753355505<\/p>\r\n    <a class=\"btn\" href=\"https:\/\/www.26yc.com\/fr\/contact-us\/\">Request a quote &rarr;<\/a>\r\n    <div class=\"links\">\r\n      Related:\r\n      <a href=\"https:\/\/www.26yc.com\/fr\/tools\/selection-guide\/\">Type comparison<\/a> &middot;\r\n      <a href=\"https:\/\/www.26yc.com\/fr\/tools\/application-wizard\/\">Application selector<\/a> |\r\n      <a href=\"https:\/\/www.26yc.com\/fr\/industrial\/heat-exchanger\/\">Heat exchanger guide<\/a> &middot;\r\n      <a href=\"https:\/\/www.26yc.com\/fr\/heat-recovery\/\">Heat recovery articles<\/a>\r\n    <\/div>\r\n  <\/section>\r\n\r\n<\/div>\n<h2>How to use this tool in a specification<\/h2>\n<p>These results are a first-pass screening aid. Confirm the duty point against certified test data (EN 308 \/ AHRI 1060), the applicable energy code, and the manufacturer datasheet before issuing a purchase specification. For a verified sizing, <a href=\"\/fr\/contact-us\/\">send us your airflow and temperatures<\/a>.<\/p>\n<h2>Frequently asked questions<\/h2>\n<h3>What is the difference between ERV and HRV?<\/h3>\n<p>HRV (Heat Recovery Ventilation) transfers sensible heat only. ERV (Energy Recovery Ventilation) transfers both sensible heat and moisture (latent\/enthalpy). Use HRV where humidity transfer is unwanted or streams are separated; use ERV where controlling indoor humidity load matters (pools, humid climates, shared building air).<\/p>\n<h2>Continue reading<\/h2>\n<p>Related: <a href=\"\/fr\/heat-recovery-standards-ashrae-iecc\/\">ASHRAE &#038; IECC requirements<\/a>, <a href=\"\/fr\/seasonal-energy-recovery-efficiency\/\">seasonal efficiency<\/a>, <a href=\"\/fr\/eurovent-certification-energy-recovery\/\">Eurovent certification<\/a> &middot; <a href=\"\/fr\/tools\/\">all heat recovery tools<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>A quick reference for the standards and terms that appear in heat-recovery specifications: EN 308, AHRI 1060, ASHRAE 84, EN 16798 and GB\/T 21087, the effectiveness and leakage definitions, and the formulas used to convert test data into a duty point. Keep it open while reading a manufacturer datasheet or writing a ventilation specification. How [&hellip;]<\/p>\n","protected":false},"author":0,"featured_media":0,"parent":5323,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-5354","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/pages\/5354","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/types\/page"}],"replies":[{"embeddable":true,"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/comments?post=5354"}],"version-history":[{"count":0,"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/pages\/5354\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/pages\/5323"}],"wp:attachment":[{"href":"https:\/\/www.26yc.com\/fr\/wp-json\/wp\/v2\/media?parent=5354"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}