{"id":2582,"date":"2018-01-18T15:52:16","date_gmt":"2018-01-18T15:52:16","guid":{"rendered":"http:\/\/ry0xysuxf.preview.infomaniak.website\/?p=2582"},"modified":"2023-11-10T17:16:55","modified_gmt":"2023-11-10T17:16:55","slug":"21-the-flow-units","status":"publish","type":"post","link":"https:\/\/www.airvision.be\/en\/21-the-flow-units\/","title":{"rendered":"21. The flow units"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Mass flow and volume flow<\/h2>\n\n\n\n<p>According the routing sheet, the flow to be realized by the fan is given in volume flow (m\u00b3\/h) or in mass flow(kg\/h).<br>The fans is a volumetric machine, it operates only with effective m\u00b3\/h of air. To make conversions, it is important to remind what the density of the air is. (Please refer to our article \u201cthe density\u201d)<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"631\" height=\"407\" src=\"https:\/\/www.airvision.be\/wp-content\/uploads\/01-64.jpg\" alt=\"\" class=\"wp-image-5227\" style=\"width:301px;height:auto\" srcset=\"https:\/\/www.airvision.be\/wp-content\/uploads\/01-64.jpg 631w, https:\/\/www.airvision.be\/wp-content\/uploads\/01-64-300x194.jpg 300w\" sizes=\"auto, (max-width: 631px) 100vw, 631px\" \/><\/figure>\n<\/div>\n\n\n<p>Let\u2019s take an easy example with the following values:<br>Temperature: T= 20\u00b0C and the installation at the sea level density: \u03c1 = 1,204 kg\/m\u00b3<br>Flow to be carried out by the fan: Q = 1000 m\u00b3\/h<br>The fan carries then 1204 kg\/h according the formula<br>Q (kg\/h) = Q (m\u00b3\/h) x \u03c1 (kg\/m\u00b3)<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"503\" height=\"315\" src=\"https:\/\/www.airvision.be\/wp-content\/uploads\/01-66.jpg\" alt=\"\" class=\"wp-image-5233\" style=\"width:354px;height:auto\" srcset=\"https:\/\/www.airvision.be\/wp-content\/uploads\/01-66.jpg 503w, https:\/\/www.airvision.be\/wp-content\/uploads\/01-66-300x188.jpg 300w\" sizes=\"auto, (max-width: 503px) 100vw, 503px\" \/><\/figure>\n<\/div>\n\n\n<p>Temperature: T= 20\u00b0C and installation at the sea level<br>Density: \u03c1 = 1,204 kg\/m\u00b3<br>Flow to be carried out by the fan: Q = 1000 kg\/h<br>The fan carries then effective 831 m\u00b3\/h according the formula.<br>Q (m\u00b3\/h) = Q (kg\/h) \/ \u03c1 (kg\/m\u00b3)<\/p>\n\n\n\n<div style=\"height:24px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Liters\/h or m\u00b3\/h?<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"625\" height=\"305\" src=\"https:\/\/www.airvision.be\/wp-content\/uploads\/01-67.jpg\" alt=\"\" class=\"wp-image-5236\" style=\"width:339px;height:auto\" srcset=\"https:\/\/www.airvision.be\/wp-content\/uploads\/01-67.jpg 625w, https:\/\/www.airvision.be\/wp-content\/uploads\/01-67-300x146.jpg 300w\" sizes=\"auto, (max-width: 625px) 100vw, 625px\" \/><\/figure>\n<\/div>\n\n\n<p>The density is not interfering in order to convert Liters\/h to m\u00b3\/h.<br>Flow to be carried out by the fan: 100.000 liters\/h<br>The fan carries 100 m\u00b3\/h<\/p>\n\n\n\n<p>Q (m\u00b3\/h) = Q (l\/h) \/ 1000<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Nm\u00b3 or effective m\u00b3\/h?<\/h2>\n\n\n\n<p>The normal m\u00b3 is considered at the temperature of 0\u00b0C and at the atmospheric pressure at the sea level. For the air its density is \u03c10 = 1,293 kg\/m\u00b3. To select a fan, we should take into account the density of the air crossing the fan.<br>For example a flow of 1000 Nm\u00b3\/h at the temperature of 20\u00b0C with \u03c11 = 1,204 kg\/m\u00b3 will give 1074 effective m\u00b3\/h according the formula.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"539\" height=\"150\" src=\"https:\/\/www.airvision.be\/wp-content\/uploads\/01-65.jpg\" alt=\"\" class=\"wp-image-5230\" style=\"width:348px;height:auto\" srcset=\"https:\/\/www.airvision.be\/wp-content\/uploads\/01-65.jpg 539w, https:\/\/www.airvision.be\/wp-content\/uploads\/01-65-300x83.jpg 300w\" sizes=\"auto, (max-width: 539px) 100vw, 539px\" \/><\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Mass flow and volume flow According the routing sheet, the flow to be realized by the fan is given in volume flow (m\u00b3\/h) or in mass flow(kg\/h).The fans is a [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":613,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2582","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-articles"],"_links":{"self":[{"href":"https:\/\/www.airvision.be\/en\/wp-json\/wp\/v2\/posts\/2582","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.airvision.be\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.airvision.be\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.airvision.be\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.airvision.be\/en\/wp-json\/wp\/v2\/comments?post=2582"}],"version-history":[{"count":5,"href":"https:\/\/www.airvision.be\/en\/wp-json\/wp\/v2\/posts\/2582\/revisions"}],"predecessor-version":[{"id":5255,"href":"https:\/\/www.airvision.be\/en\/wp-json\/wp\/v2\/posts\/2582\/revisions\/5255"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.airvision.be\/en\/wp-json\/wp\/v2\/media\/613"}],"wp:attachment":[{"href":"https:\/\/www.airvision.be\/en\/wp-json\/wp\/v2\/media?parent=2582"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.airvision.be\/en\/wp-json\/wp\/v2\/categories?post=2582"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.airvision.be\/en\/wp-json\/wp\/v2\/tags?post=2582"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}