{"id":20611,"date":"2024-10-10T08:48:24","date_gmt":"2024-10-10T06:48:24","guid":{"rendered":"https:\/\/mag.ebmpapst.com\/en\/?p=20611"},"modified":"2025-08-19T14:29:53","modified_gmt":"2025-08-19T12:29:53","slug":"the-formula-for-the-air-flow-in-electronic-cooling-applications","status":"publish","type":"post","link":"https:\/\/mag.ebmpapst.com\/en\/allgemein\/the-formula-for-the-air-flow-in-electronic-cooling-applications_20611\/","title":{"rendered":"The formula for the air flow in&nbsp;elec\u00adtronic cooling appli\u00adca\u00adtions"},"content":{"rendered":"\n<p>An engineer\u2019s life would be so much easier if perfect energy conver\u00adsion were possible. However, our world is full of losses. Servers, network archi\u00adtec\u00adture and solar inverters get hot. Their power dissi\u00adpa\u00adtion <em>(Pv)<\/em> is converted into heat output of equal size, which raises the temper\u00ada\u00adture of the air supplied for cooling <em>(\u2206T)<\/em>. If the compo\u00adnents are just cooled with air, for example, it is only neces\u00adsary to know the specific thermal capacity of the air <em>(cp)<\/em> and its density <em>(\u03f1)<\/em> in order to calcu\u00adlate the air flow <em>(V\u0307)<\/em> the fans must produce to ensure that the air is kept within the maximum permis\u00adsible heating limits.<\/p>\n\n\n\n<div class=\"wp-block-group alignfull mgznkr-cta-retrofit-banner\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<style>\n.mgznkr-cta-retrofit-banner .alignwide.banner-width {\n  max-width: 100%;\n  width: 1240px;\n  margin: 0 auto;\n--mark-bgcolor: #00a633;\n--mark-color: white;\n}\n@media (max-width: 781px) {\n.mgznkr-cta-retrofit-banner .wp-block-cover .wp-block-cover__image-background {\nobject-position: 17% 50%!important;\n}\n\n.mgznkr-column-spacer p {display: none; }\n}\n@media (min-width: 782px) {\n.mgznkr-column-spacer p a {\n  min-height: 290px;\n  min-width: 100%;\n  display: block;\n  border-radius: 50px;\nfont-size: 0;\n}\n}\n\n.mgznkr-cta-retrofit-banner .wp-block-columns .wp-block-column:first-of-type{\n    position:relative;\n}\n.mgznkr-cta-retrofit-banner .wp-block-columns .wp-block-column:first-of-type::before {\n    content: \"\";\n    position: absolute;\n    width: 170%;\n    height: 100%;\n    background: #a2b91e;\n    z-index: 0;\n    top: 0;\n    left: 0;\n}\n.mgznkr-cta-retrofit-banner .wp-block-column{\n    z-index: 10;\n    &:first-of-type{\n        padding-left: 4rem;\n    }\n}\n.mgznkr-cta-retrofit-banner .wp-block-column *{\nposition: relative;\nz-index: 10;\n}\n.mgznkr-cta-retrofit-banner .wp-block-column figure.wp-block-image{\n    margin-bottom: 0;\n}\n@media (width < 782px){\n.mgznkr-cta-retrofit-banner .mgznkr-mobile-hidden{\ndisplay: none;\n}\n.mgznkr-cta-retrofit-banner .wp-block-columns .wp-block-column:first-of-type{\n  padding-right: 4rem;\n}\n.mgznkr-cta-retrofit-banner .wp-block-columns .wp-block-column:first-of-type::before {\n  width: 100%;\n}\n}\n\n<\/style>\n\n\n\n<div style=\"height:32px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-cover\" style=\"min-height:350px;aspect-ratio:unset;\"><img decoding=\"async\" class=\"wp-block-cover__image-background wp-image-38370 size-large\" alt src=\"https:\/\/ebmpapst-7237.kxcdn.com\/de\/files\/2025\/08\/L2A-Awareness-Campaign-960x400.webp\" data-object-fit=\"cover\"><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim-0 has-background-dim\" style=\"background-color:#e0e6e6\"><\/span><div class=\"wp-block-cover__inner-container is-layout-constrained wp-block-cover-is-layout-constrained\">\n<div class=\"wp-block-columns alignwide banner-width is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<h2 class=\"wp-block-heading mgznkr-click has-white-color has-text-color has-link-color wp-elements-9c437f00d7951dd60554c7a2708cd1c5\" id=\"retrofit-banner-head\" style=\"font-size:1.6em;text-transform:uppercase\"><a href=\"https:\/\/www.ebmpapst.com\/de\/en\/campaigns\/industry-campaigns\/data-center.html#cooling-solutions\" target=\"_blank\" rel=\"noreferrer noopener\">High perfor\u00admance, low carbon:<\/a><\/h2>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>ebm-papst reimag\u00adines data center cooling. Our effi\u00adcient cooling solu\u00adtions combine energy effi\u00adciency with high power density.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-fill mgznkr-click\" id=\"retrofit-banner-button\"><a class=\"wp-block-button__link has-background has-custom-font-size wp-element-button\" href=\"https:\/\/www.ebmpapst.com\/de\/en\/campaigns\/industry-campaigns\/data-center.html#cooling-solutions\" style=\"background-color:#0072bb;font-size:18px\" target=\"_blank\" rel=\"noreferrer noopener\">Ensure reli\u00adable cooling now <i class=\"mgznkr-icon fa fa-chevron-right fas\"><\/i><\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-bottom mgznkr-column-spacer mgznkr-mobile-hidden is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/ebmpapst-7237.kxcdn.com\/de\/files\/2025\/08\/L2A-Awareness-Campaign-00-scaled.webp\" alt class=\"wp-image-38386\" style=\"object-fit:cover\"><\/figure>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<div style=\"height:36px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/ebmpapst-7237.kxcdn.com\/de\/files\/2024\/09\/Tobias-Sieger.webp\" alt class=\"wp-image-35619\" style=\"width:155px\"><figcaption class=\"wp-element-caption\">Tobias Sieger, Team Leader Fluid Mechanics (Photo| ebm-papst)<\/figcaption><\/figure>\n<\/div>\n\n\n<p>However, as a rule, this calcu\u00adla\u00adtion is just a first approx\u00adi\u00adma\u00adtion that is followed by more complex modeling and thermal simu\u00adla\u00adtion. Along\u00adside the specific geom\u00adetry of the instal\u00adla\u00adtion site, factors include the heat transfer resis\u00adtance of all the mate\u00adrials involved, such as the compo\u00adnents, assem\u00adblies, the inte\u00adrior air, hous\u00adings and the exte\u00adrior air. In the case of solids, consis\u00adtent simu\u00adla\u00adtions are rela\u00adtively easy to achieve if the mass and heat transfer resis\u00adtance of the indi\u00advidual mate\u00adrials\u200a\u2014\u200asuch as copper and plas\u00adtics\u200a\u2014\u200aare known.<\/p>\n\n\n\n<div class=\"wp-block-group article-sidebox\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<figure class=\"wp-block-image size-full img-border\"><img loading=\"lazy\" decoding=\"async\" width=\"1920\" height=\"1080\" src=\"https:\/\/ebmpapst-7237.kxcdn.com\/en\/files\/2023\/02\/NTT-DataCenter_inside_1920x1080.jpg\" alt class=\"wp-image-17129\" style=\"aspect-ratio:1;object-fit:cover\" srcset=\"https:\/\/ebmpapst-7237.kxcdn.com\/en\/files\/2023\/02\/NTT-DataCenter_inside_1920x1080.jpg 1920w, https:\/\/ebmpapst-7237.kxcdn.com\/en\/files\/2023\/02\/NTT-DataCenter_inside_1920x1080-660x371.jpg 660w, https:\/\/ebmpapst-7237.kxcdn.com\/en\/files\/2023\/02\/NTT-DataCenter_inside_1920x1080-960x540.jpg 960w, https:\/\/ebmpapst-7237.kxcdn.com\/en\/files\/2023\/02\/NTT-DataCenter_inside_1920x1080-260x146.jpg 260w, https:\/\/ebmpapst-7237.kxcdn.com\/en\/files\/2023\/02\/NTT-DataCenter_inside_1920x1080-1536x864.jpg 1536w, https:\/\/ebmpapst-7237.kxcdn.com\/en\/files\/2023\/02\/NTT-DataCenter_inside_1920x1080-450x253.jpg 450w, https:\/\/ebmpapst-7237.kxcdn.com\/en\/files\/2023\/02\/NTT-DataCenter_inside_1920x1080-300x169.jpg 300w\" sizes=\"auto, (max-width: 1920px) 100vw, 1920px\"><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">ebm-papst in data\u00adcen\u00adters<\/h3>\n\n\n\n<p>From a struc\u00adtural point of view, no two data centers are alike. That's why with ebm\u2011papst there is not just one, but a variety of good solu\u00adtions.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-fill\"><a class=\"wp-block-button__link has-custom-font-size wp-element-button\" href=\"https:\/\/www.ebmpapst.com\/de\/en\/industries\/data-centers.html#brochure\" style=\"font-size:18px\" target=\"_blank\" rel=\"noreferrer noopener\">Learn more <i class=\"mgznkr-icon fa fa-chevron-right fas\"><\/i><\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<p>However, it can be tricky to deter\u00admine the resis\u00adtance of compo\u00adnent contacts, i.e., at the tran\u00adsi\u00adtion between the indi\u00advidual compo\u00adnents of an assembly. Factors such as surface rough\u00adness, air bubbles trapped in the adhe\u00adsive, or gaps play a role here. However, the biggest chal\u00adlenge in thermal insu\u00adla\u00adtion is always the transfer of heat from the surfaces of \u00adsolids to the air and vice versa. In specific construc\u00adtion situ\u00ada\u00adtions, many surfaces are often arranged consec\u00adu\u00adtively. Exact simu\u00adla\u00adtions are impor\u00adtant because a differ\u00adence in temper\u00ada\u00adture of just one or two Kelvin can have a signif\u00adi\u00adcant impact on the service life of elec\u00adtronic compo\u00adnents.\u2002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/ebmpapst-7237.kxcdn.com\/de\/files\/2024\/09\/Grafik.webp\" alt class=\"wp-image-35620\" style=\"object-fit:cover\"><figcaption class=\"wp-element-caption\">CHT (conju\u00adgate heat transfer) flow simu\u00adla\u00adtion is used to deter\u00admine the distri\u00adb\u00adu\u00adtion of the heat transfer coef\u00adfi\u00adcients on the surface of a compact fan drive system. (Graphic | ebm-papst)<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>An engineer\u2019s life would be so much easier if perfect energy conver\u00adsion were possible. However, our world is full of losses. Servers, network archi\u00adtec\u00adture and solar inverters get hot. Their power dissi\u00adpa\u00adtion (Pv) is converted into heat output of equal size, which raises the temper\u00ada\u00adture of the air supplied for cooling (\u2206T). If the compo\u00adnents [\u2026]<\/p>\n","protected":false},"author":43,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"wp_typography_post_enhancements_disabled":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-20611","post","type-post","status-publish","format-standard","hentry","category-allgemein"],"acf":[],"_links":{"self":[{"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/posts\/20611","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/users\/43"}],"replies":[{"embeddable":true,"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/comments?post=20611"}],"version-history":[{"count":14,"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/posts\/20611\/revisions"}],"predecessor-version":[{"id":21792,"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/posts\/20611\/revisions\/21792"}],"wp:attachment":[{"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/media?parent=20611"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/categories?post=20611"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/tags?post=20611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}