{"id":617904,"date":"2024-11-05T23:27:08","date_gmt":"2024-11-05T23:27:08","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/iso-51362003\/"},"modified":"2024-11-05T23:27:08","modified_gmt":"2024-11-05T23:27:08","slug":"iso-51362003","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/iso\/iso-51362003\/","title":{"rendered":"ISO 5136:2003"},"content":{"rendered":"

ISO 5136 specifies a method for testing ducted fans and other air-moving devices to determine the sound power radiated into an anechoically terminated duct on the inlet and\/or outlet side of the equipment.<\/p>\n

The method is applicable to fans which emit steady, broad-band, narrow-band and discrete-frequency sound and to air temperatures between – 50 \u00b0C and + 70 \u00b0C. The test duct diameter range is from 0,15 m to 2 m. Test methods for small (d <\/em>< 0,15 m) and large (d <\/em>> 2 m) test ducts are described in the informative annexes H and I, respectively.<\/p>\n

The maximum mean flow velocity at the microphone head for which the method is suitable, depends on the type of microphone shield used, and is as follows:<\/p>\n

foam ball 15 m\/s; nose cone 20 m\/s; sampling tube 40 m\/s.<\/p>\n

Above these values the suppression of turbulent pressure fluctuations by the microphone shield may be insufficient.<\/p>\n

The method described in ISO 5136 is applicable to a sound source in which a fan is connected to ducts on at least one side. It is also applicable to other fan\/attenuator combinations or equipment incorporating fans which can be considered as "black boxes".<\/p>\n

Examples of fans and other equipment covered by ISO 5136 are<\/p>\n

ducted centrifugal fans, ducted axial flow fans, ducted mixed-flow fans, ducted air-handling units, ducted dust-collection units, ducted air-conditioning units, and ducted furnaces.<\/p>\n

ISO 5136 is also applicable to other aerodynamic sources such as boxes, dampers and throttle devices provided that a quiet air flow delivered by an auxiliary fan is available, and the signal-to-noise ratio of sound pressures to turbulent pressure fluctuations in the test duct is at least 6 dB.<\/p>\n

It is not applicable to non-ducted fans or equipment.<\/p>\n","protected":false},"excerpt":{"rendered":"

Acoustics \u2014 Determination of sound power radiated into a duct by fans and other air-moving devices \u2014 In-duct method<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ISO<\/b><\/a><\/td>\n2003-04<\/td>\n76<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":617915,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[268,374,2634],"product_tag":[],"class_list":{"0":"post-617904","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-17-140-20","7":"product_cat-23-120","8":"product_cat-iso","10":"first","11":"instock","12":"sold-individually","13":"shipping-taxable","14":"purchasable","15":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/617904","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/617915"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=617904"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=617904"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=617904"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}