{"id":801,"date":"2020-06-27T14:11:19","date_gmt":"2020-06-27T14:11:19","guid":{"rendered":"https:\/\/www.zillionsbuyer.com\/blog\/?p=801"},"modified":"2020-08-03T10:10:52","modified_gmt":"2020-08-03T10:10:52","slug":"what-is-fan-performance-and-efficiency-with-respect-to-fan-design-and-selection-criteria","status":"publish","type":"post","link":"https:\/\/www.zillionsbuyer.com\/blog\/what-is-fan-performance-and-efficiency-with-respect-to-fan-design-and-selection-criteria\/","title":{"rendered":"What is Fan Performance And Efficiency With Respect To Fan Design And Selection Criteria."},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Typical static pressure\nand power requirements<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In the case of <strong>centrifugal fans<\/strong>, the hub-to-tip ratios\n(ratio of inner-to-outer impeller diameter), the tip angles (angle at which\nforward or backward curved blades are curved at the blade tip &#8211; at the base the\nblades are always oriented in the direction of flow), and the blade width\ndetermines the pressure developed by the fan.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Forward <strong>curved fans<\/strong> have large hub-to-tip ratio\ncompared to backward curved fans and produce lower pressure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At both design and\noff-design points, backward curved fans provide the most stable operation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Also, the power required\nby most backward curved fans will decrease at flow higher than design values<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A similar effect can be\nobtained by using inlet guide vanes instead of replacing the impeller with\ndifferent tip angles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/www.zillionsbuyer.com\/product\/3946\/makita-cordless-fan-vest-dfv210zxl-effective-cooling-even-if-the-front-zipper-doesnt-close-completely\">Radial\nfans<\/a><\/strong>\nare simple in construction and are preferable for <strong>high-pressure applications<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Axial-flow fans<\/strong> produce lower pressure than centrifugal fans, and\nexhibit a dip in pressure before reaching the peak pressure point.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Propeller-type fans are\ncapable of high-flow rates at low pressures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tube-axial fans have\nmedium pressure, high flow capability and are not equipped with guide vanes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/www.zillionsbuyer.com\/home\/category\/0\/0-0\/0\/0\/fan\">Vane-axial\nfans<\/a><\/strong>\nare equipped with inlet or outlet guide vanes, and are characterized by high\npressure, medium flow-rate capabilities.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Performance is also\ndependant on the fan enclosure and duct design.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Spiral housing designs with inducers, diffuses are more efficient as compared to square housings.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Inlet and outlet\nconditions (whirl and turbulence created by grills, dampers, etc.) can\nsignificantly alter fan performance curves from the provided by the\nmanufacturer (which are developed under controlled conditions).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Bends and elbows in the inlet or outlet ducting can change\nthe velocity of air<\/strong>, thereby changing fan characteristics (the pressure drop in\nthese elements is attributed to the system resistance).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">All these factors, termed\nas System Effect Factors, should, therefore, be carefully evaluated during fan\nselection since they would modify the fan performance curve.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Typical static pressure and power requirements In the case of centrifugal fans, the hub-to-tip ratios (ratio of inner-to-outer impeller diameter), the tip angles (angle at which forward or backward curved blades are curved at the blade tip &#8211; at the base the blades are always oriented in the direction of flow), and the blade width [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-801","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts\/801","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/comments?post=801"}],"version-history":[{"count":2,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts\/801\/revisions"}],"predecessor-version":[{"id":2305,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts\/801\/revisions\/2305"}],"wp:attachment":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/media?parent=801"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/categories?post=801"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/tags?post=801"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}