{"id":13077,"date":"2026-07-21T07:18:51","date_gmt":"2026-07-21T07:18:51","guid":{"rendered":"https:\/\/8ruiyan.com\/?p=13077"},"modified":"2026-07-21T07:19:15","modified_gmt":"2026-07-21T07:19:15","slug":"air-heater-5","status":"publish","type":"post","link":"https:\/\/8ruiyan.com\/ru\/air-heater-5\/","title":{"rendered":"How to Calculate Air Heater Power: Airflow and Temperature Rise"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Selecting the correct\u00a0<strong>air heater power<\/strong> <a href=\"https:\/\/8ruiyan.com\/en\/all-air-heaters\/\">https:\/\/8ruiyan.com\/en\/all-air-heaters\/<\/a>\u00a0is the most critical step in any thermal system design. Under-sizing leads to insufficient outlet temperature; over-sizing wastes energy and increases cost. The entire calculation rests on a straightforward energy balance formula.<\/p>\n\n\n\n<div class=\"wp-block-uagb-image uagb-block-3d270d4c wp-block-uagb-image--layout-default wp-block-uagb-image--effect-static wp-block-uagb-image--align-none\"><figure class=\"wp-block-uagb-image__figure\"><img loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/8ruiyan.com\/wp-content\/uploads\/2026\/07\/6fb220181aa22d342b61a05776924a2a-576x1024.jpg ,https:\/\/8ruiyan.com\/wp-content\/uploads\/2026\/07\/6fb220181aa22d342b61a05776924a2a.jpg 780w, https:\/\/8ruiyan.com\/wp-content\/uploads\/2026\/07\/6fb220181aa22d342b61a05776924a2a.jpg 360w\" sizes=\"auto, (max-width: 480px) 150px\" src=\"https:\/\/8ruiyan.com\/wp-content\/uploads\/2026\/07\/6fb220181aa22d342b61a05776924a2a-576x1024.jpg\" alt=\"\u00a0air heater power\" class=\"uag-image-13070\" width=\"576\" height=\"1024\" title=\"\u00a0air heater power\" role=\"img\"\/><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">The Basic Formula<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>P = Q \u00d7 \u03c1 \u00d7 Cp \u00d7 \u0394T \/ \u03b7<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>P<\/strong>\u00a0= Power (kW)<\/li>\n\n\n\n<li><strong>Q<\/strong>\u00a0= Airflow (m\u00b3\/s)<\/li>\n\n\n\n<li><strong>\u03c1<\/strong>\u00a0= Air density (\u22481.2 kg\/m\u00b3 at 20\u00b0C)<\/li>\n\n\n\n<li><strong>Cp<\/strong>\u00a0= Specific heat of air (\u22481.005 kJ\/kg\u00b7K)<\/li>\n\n\n\n<li><strong>\u0394T<\/strong>\u00a0= Temperature rise (outlet \u2013 inlet, in \u00b0C or K)<\/li>\n\n\n\n<li><strong>\u03b7<\/strong>\u00a0= Heater efficiency (use 0.95\u20131.0 for electric, 0.7\u20130.9 for gas)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Simplified Practical Version<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For electric heaters, you can use this quick approximation:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>P (kW) \u2248 0.00034 \u00d7 Q (m\u00b3\/h) \u00d7 \u0394T (\u00b0C)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<br>Heating 500 m\u00b3\/h of air from 20\u00b0C to 80\u00b0C (\u0394T = 60\u00b0C)<br>P \u2248 0.00034 \u00d7 500 \u00d7 60 =&nbsp;<strong>10.2 kW<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What About Mass Flow?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If you know mass flow (kg\/s) instead of volume flow, use:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>P = \u1e41 \u00d7 Cp \u00d7 \u0394T \/ \u03b7<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With \u1e41 = Q \u00d7 \u03c1. This is often more accurate because density changes with temperature.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Important Notes<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Density correction<\/strong>: Air density drops as temperature rises. For \u0394T > 50\u00b0C, recalculate \u03c1 at the average temperature.<\/li>\n\n\n\n<li><strong>Start-up vs. steady state<\/strong>: The formula gives steady-state power. For cold start-ups, add 10\u201320% margin for thermal inertia.<\/li>\n\n\n\n<li><strong>Pressure drop<\/strong>: Higher pressure increases density, which raises power demand. Compressible effects matter above 2\u20133 bar.<\/li>\n\n\n\n<li><strong>Altitude<\/strong>: At high altitudes, lower density means less power for the same \u0394T.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Quick Reference Table (Electric, \u03b7\u22480.98)<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Airflow (m\u00b3\/h)<\/th><th class=\"has-text-align-left\" data-align=\"left\">\u0394T = 20\u00b0C<\/th><th class=\"has-text-align-left\" data-align=\"left\">\u0394T = 50\u00b0C<\/th><th class=\"has-text-align-left\" data-align=\"left\">\u0394T = 100\u00b0C<\/th><\/tr><\/thead><tbody><tr><td>100<\/td><td>0.7 kW<\/td><td>1.7 kW<\/td><td>3.4 kW<\/td><\/tr><tr><td>500<\/td><td>3.4 kW<\/td><td>8.5 kW<\/td><td>17.0 kW<\/td><\/tr><tr><td>1000<\/td><td>6.8 kW<\/td><td>17.0 kW<\/td><td>34.0 kW<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Final Rule of Thumb<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For electric air heating at sea level:\u00a0<strong>1 kW of air heater power heats roughly 300 m\u00b3\/h of air by 10\u00b0C.<\/strong><br>Always oversize your\u00a0<strong>air heater power<\/strong>\u00a0by 10% to account for voltage fluctuations, aging elements, and heat losses through ductwork. That small margin ensures your air heater delivers the required performance consistently over its entire service life.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For further problems about electric air heater<em>,<\/em>&nbsp;, please contact our technical team for expert advice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Whatsapp:86-19106101570<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">wechat:86-19106101570<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">email:fob@jsryan.com<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"http:\/\/www.8ruiyan.com\/\">http:\/\/www.8ruiyan.com<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>Selecting the correct\u00a0air heater power https:\/\/8ruiyan. [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","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":"","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":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","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":[1],"tags":[],"class_list":["post-13077","post","type-post","status-publish","format-standard","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Air Heater Power: How to Calculate Correctly<\/title>\n<meta name=\"description\" content=\"Learn to calculate air heater power from airflow and temperature rise. 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