{"id":6258,"date":"2022-12-05T10:00:12","date_gmt":"2022-12-05T04:30:12","guid":{"rendered":"https:\/\/sa179tubes.com\/?p=6258"},"modified":"2024-05-18T12:10:33","modified_gmt":"2024-05-18T12:10:33","slug":"how-to-calculate-the-heat-duty-for-heat-exchangers","status":"publish","type":"post","link":"https:\/\/sa179tubes.com\/blog\/how-to-calculate-the-heat-duty-for-heat-exchangers\/","title":{"rendered":"How to calculate the heat duty for heat Exchangers ?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"6258\" class=\"elementor elementor-6258\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-db30005 elementor-section-full_width elementor-section-stretched elementor-section-height-default elementor-section-height-default wpr-particle-no wpr-jarallax-no wpr-parallax-no wpr-sticky-section-no\" data-id=\"db30005\" data-element_type=\"section\" data-settings=\"{&quot;stretch_section&quot;:&quot;section-stretched&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-wider\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-cd1f1d6\" data-id=\"cd1f1d6\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-11e19e0 elementor-widget elementor-widget-heading\" data-id=\"11e19e0\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.21.0 - 24-04-2024 *\/\n.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}<\/style><h1 class=\"elementor-heading-title elementor-size-default\">How to calculate the heat duty for heat Exchangers ?\n<\/h1>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-03f0890 elementor-widget elementor-widget-image\" data-id=\"03f0890\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.21.0 - 24-04-2024 *\/\n.elementor-widget-image{text-align:center}.elementor-widget-image a{display:inline-block}.elementor-widget-image a img[src$=\".svg\"]{width:48px}.elementor-widget-image img{vertical-align:middle;display:inline-block}<\/style>\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"582\" src=\"https:\/\/sa179tubes.com\/blog\/wp-content\/uploads\/2022\/12\/calculate-the-heat-duty-for-heat-exchangres.jpg\" class=\"attachment-1536x1536 size-1536x1536 wp-image-11456\" alt=\"\" srcset=\"https:\/\/sa179tubes.com\/blog\/wp-content\/uploads\/2022\/12\/calculate-the-heat-duty-for-heat-exchangres.jpg 1024w, https:\/\/sa179tubes.com\/blog\/wp-content\/uploads\/2022\/12\/calculate-the-heat-duty-for-heat-exchangres-300x171.jpg 300w, https:\/\/sa179tubes.com\/blog\/wp-content\/uploads\/2022\/12\/calculate-the-heat-duty-for-heat-exchangres-768x437.jpg 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\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-ace03d7 elementor-widget elementor-widget-text-editor\" data-id=\"ace03d7\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.21.0 - 24-04-2024 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p><span style=\"font-weight: 400;\">In order to understand exactly what we are calculating, let&#8217;s define the term &#8220;Heat duty.&#8221;. It is the amount of heat required to transfer from a hot side to a cold side over a period of time. The calculation is important to all engineers and one of the most common calculations you&#8217;ll need to know in your career if you&#8217;re a process engineer. There are two ways to calculate heat duty.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-85d1b77 elementor-widget elementor-widget-text-editor\" data-id=\"85d1b77\" data-element_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<p><span style=\"font-weight: 400;\">Speaking of Heat Exchangers, specialised boiler tubes are utilised in proper functioning of such exchangers.\u00a0 <\/span><span style=\"text-decoration: underline;\"><strong><span style=\"color: #ffffff; text-decoration: underline;\"><a style=\"color: #ffffff; text-decoration: underline;\" href=\"https:\/\/www.sa179tubes.com\/\">SA179tube.com<\/a><\/span><\/strong><\/span><span style=\"font-weight: 400;\"> Is one leading Manufacturer, Supplier &amp; Stockist Of Boiler Tubes<\/span><span style=\"text-decoration: underline;\"><strong><span style=\"color: #ffffff; text-decoration: underline;\"><a style=\"color: #ffffff; text-decoration: underline;\" href=\"https:\/\/www.sa179tubes.com\/a210-sa210-tubes\/\"> A210 Tubes And SA 210 Tubes<\/a>.<\/span><\/strong><\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6b74aef elementor-widget elementor-widget-text-editor\" data-id=\"6b74aef\" data-element_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<p><span style=\"font-weight: 400;\">Fluids that are suitable for sensible heat transfer, that is, fluids that do not undergo phase changes.<\/span><span style=\"font-weight: 400;\">Latent heat transfer, on the other hand, occurs when a fluid undergoes a phase change. i.e. condenses.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-04498dd elementor-widget elementor-widget-heading\" data-id=\"04498dd\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">How to calculate the heat duty for heat  exchangers?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d36d477 elementor-widget elementor-widget-text-editor\" data-id=\"d36d477\" data-element_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<p><span style=\"font-weight: 400;\">A210 Tubes And SA 210 Tubes Play Important Role In Heat Exchanger. To begin understanding exactly what we are calculating, let&#8217;s define the term &#8220;Heat duty&#8221;. Heat duty can be defined as the amount of heat that has to be transferred from a hot to a cold side over the course of a unit of time.<\/span><\/p><p><span style=\"font-weight: 400;\">A process engineer needs to know this calculation because it&#8217;s one of the most common ones. There are normally two ways to calculate heat duty.<\/span><\/p><p><span style=\"font-weight: 400;\">Fluids that can be used for sensible heat transfer, meaning they do not undergo phase change.\u00a0\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">In order to solve a thermal problem, we need to know several parameters. From there, further data can be determined.<\/span><\/p><p><span style=\"font-weight: 400;\">The six most important parameters include:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The amount of heat to be transferred (heat load)<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The inlet and outlet temperatures on the primary and secondary sides<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The maximum allowable pressure drop on the primary and secondary sides<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The maximum operating temperature<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The maximum operating pressure<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The flowrate on the primary and secondary sides<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">The heat load can be calculated if the flow rate, specific heat and temperature difference on one side are known.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-31df3bc elementor-widget elementor-widget-heading\" data-id=\"31df3bc\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Calculation method<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2a3a5b9 elementor-widget elementor-widget-text-editor\" data-id=\"2a3a5b9\" data-element_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<p><span style=\"font-weight: 400;\">The heat load of a heat exchanger can be derived from the following two formulas:<\/span><\/p><p><strong>1. Heat load, Theta and LMTD calculation<\/strong><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9446bfe elementor-widget elementor-widget-image\" data-id=\"9446bfe\" data-element_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<img decoding=\"async\" src=\"https:\/\/sa179tubes.com\/wp-content\/uploads\/2022\/12\/1.png\" title=\"\" alt=\"\" loading=\"lazy\" \/>\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-749e37d elementor-widget elementor-widget-text-editor\" data-id=\"749e37d\" data-element_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<p><b>Where:<\/b><\/p><p><span style=\"font-weight: 400;\">P = heat load (btu\/h)<\/span><\/p><p><span style=\"font-weight: 400;\">m = mass flow rate (lb\/h)<\/span><\/p><p><span style=\"font-weight: 400;\">c<\/span><span style=\"font-weight: 400;\">p<\/span><span style=\"font-weight: 400;\"> = specific heat (btu\/lb \u00b0F)<\/span><\/p><p><span style=\"font-weight: 400;\">\u03b4t = temperature difference between inlet and outlet on one side (\u00b0F)<\/span><\/p><p><span style=\"font-weight: 400;\">k = heat transfer coefficient (btu\/ft<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\"> h \u00b0F)<\/span><\/p><p><span style=\"font-weight: 400;\">A = heat transfer area (ft<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\">)<\/span><\/p><p><span style=\"font-weight: 400;\">LMTD = log mean temperature difference<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-55eea4e elementor-widget elementor-widget-image\" data-id=\"55eea4e\" data-element_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<img decoding=\"async\" src=\"https:\/\/sa179tubes.com\/wp-content\/uploads\/2022\/12\/2.png\" title=\"\" alt=\"\" loading=\"lazy\" \/>\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-f4203e9 elementor-widget elementor-widget-text-editor\" data-id=\"f4203e9\" data-element_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<p><span style=\"font-weight: 400;\">T1 = Inlet temperature &#8211; hot side<\/span><\/p><p><span style=\"font-weight: 400;\">T2 = Outlet temperature &#8211; hot side<\/span><\/p><p><span style=\"font-weight: 400;\">T3 = Inlet temperature &#8211; cold side<\/span><\/p><p><span style=\"font-weight: 400;\">T4 = Outlet temperature &#8211; cold side<\/span><\/p><p><strong>LMTD can be calculated by using the following formula, where \u2206T1 = T1\u2013T4 and \u2206T2 = T2\u2013T3<\/strong><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d148225 elementor-widget elementor-widget-image\" data-id=\"d148225\" data-element_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<img decoding=\"async\" src=\"https:\/\/sa179tubes.com\/wp-content\/uploads\/2022\/12\/3.png\" title=\"\" alt=\"\" loading=\"lazy\" \/>\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-a3d3192 elementor-widget elementor-widget-text-editor\" data-id=\"a3d3192\" data-element_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<p><strong>2. Heat transfer coefficient and design margin<\/strong><\/p><p><span style=\"font-weight: 400;\">The total overall heat transfer coefficient k is defined as:<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-25bda32 elementor-widget elementor-widget-image\" data-id=\"25bda32\" data-element_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<img decoding=\"async\" src=\"https:\/\/sa179tubes.com\/wp-content\/uploads\/2022\/12\/4.png\" title=\"\" alt=\"\" loading=\"lazy\" \/>\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-643a880 elementor-widget elementor-widget-text-editor\" data-id=\"643a880\" data-element_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<p><span style=\"font-weight: 400;\">\u03b1<\/span><span style=\"font-weight: 400;\">1<\/span><span style=\"font-weight: 400;\"> = The heat transfer coefficient between the warm medium and the heat transfer surface (btu\/ft<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\"> h \u00b0F)<\/span><\/p><p><span style=\"font-weight: 400;\">\u03b1<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\"> = The heat transfer coefficient between the heat transfer surface and the cold medium (btu\/ft<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\"> h \u00b0F)<\/span><\/p><p><span style=\"font-weight: 400;\">\u03b4 = The thickness of the heat transfer surface (ft)<\/span><\/p><p><span style=\"font-weight: 400;\">R<\/span><span style=\"font-weight: 400;\">f<\/span><span style=\"font-weight: 400;\"> = The fouling factor (ft<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\"> h \u00b0F\/btu)<\/span><\/p><p><span style=\"font-weight: 400;\">\u03bb = The thermal conductivity of the material separating the medias (btu\/ft h \u00b0F)<\/span><\/p><p><span style=\"font-weight: 400;\">k<\/span><span style=\"font-weight: 400;\">c<\/span><span style=\"font-weight: 400;\"> = Clean heat transfer coefficient (Rf=0) (btu\/ft<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\"> h \u00b0F)<\/span><\/p><p><span style=\"font-weight: 400;\">k = Design heat transfer coefficient (btu\/ft<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\"> h \u00b0F)<\/span><\/p><p><span style=\"font-weight: 400;\">M = Design Margin (%)<\/span><\/p><p><span style=\"font-weight: 400;\">Combination of these two formulas gives: M = k<\/span><span style=\"font-weight: 400;\">c<\/span><span style=\"font-weight: 400;\"> \u00b7 R<\/span><span style=\"font-weight: 400;\">f<\/span><\/p><p><span style=\"font-weight: 400;\">i.e the higher k<\/span><span style=\"font-weight: 400;\">c<\/span><span style=\"font-weight: 400;\"> value, the lower R<\/span><span style=\"font-weight: 400;\">f<\/span><span style=\"font-weight: 400;\">-value to achieve the same design margin.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3403f5e elementor-widget elementor-widget-text-editor\" data-id=\"3403f5e\" data-element_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<p><span style=\"font-weight: 400;\">SA179tubes.com is a leading supplier, stockist, manufacturer &amp; exporter of <\/span><span style=\"text-decoration: underline;\"><strong><span style=\"color: #ffffff; text-decoration: underline;\"><a style=\"color: #ffffff; text-decoration: underline;\" href=\"https:\/\/www.sa179tubes.com\/a210-sa210-tubes\/\">A210 Tubes &amp; SA 210 Tubes<\/a><\/span><\/strong><\/span><span style=\"font-weight: 400;\">. Get in touch with us for the best rates &amp; availability. <\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-684572c\" data-id=\"684572c\" data-element_type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-042a68b elementor-widget elementor-widget-heading\" data-id=\"042a68b\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Get In Touch<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-58fa726 elementor-widget elementor-widget-text-editor\" data-id=\"58fa726\" data-element_type=\"widget\" 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248z\"><\/path><\/svg>\t\t\t\t\t<\/a>\n\t\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>How to calculate the heat duty for heat Exchangers ? In order to understand exactly what we are calculating, let&#8217;s define the term &#8220;Heat duty.&#8221;. It is the amount of heat required to transfer from a hot side to a cold side over a period of time. The calculation is important to all engineers and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11456,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to calculate the heat duty for heat Exchangers ? - Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sa179tubes.com\/blog\/how-to-calculate-the-heat-duty-for-heat-exchangers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to calculate the heat duty for heat Exchangers ? - Blog\" \/>\n<meta property=\"og:description\" content=\"How to calculate the heat duty for heat Exchangers ? In order to understand exactly what we are calculating, let&#8217;s define the term &#8220;Heat duty.&#8221;. It is the amount of heat required to transfer from a hot side to a cold side over a period of time. 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