論文

査読有り 本文へのリンクあり
2017年

Decline of the performance of a portable axial-flow fan due to the friction and duct bending loss of a connected flexible duct

JOURNAL OF OCCUPATIONAL HEALTH
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回数 : 89
  • Jun Ojima

59
2
開始ページ
210
終了ページ
213
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1539/joh.16-0091-OP
出版者・発行元
JAPAN SOC OCCUPATIONAL HEALTH

Objectives: In a job site, a portable fan is often used to ventilate a confined space. When a portable fan is applied to such a space, the actual ventilation flow rate must be accurately estimated in advance because the safety level of contaminant and oxygen concentrations in the space will determine the ventilation requirements. When a portable fan is used with a flexible duct, the actual flow rate of the fan decreases due to the friction and duct bending loss of the duct. Intending to show the decline of a fan performance, the author conducted laboratory experiments and reported the quantitative effect of the friction and duct bending loss of a flexible duct to the flow rate of a portable fan. Methods: Four commercial portable fans of different specifications were procured for the experiments, and the decline of the performance of each portable fan due to the friction loss etc. of a connected flexible duct was investigated by measuring actual flow rate. Results : The flow rate showed an obvious decrease from the rated flow rate when a flexible duct was connected. Connection of a straight polyester flexible duct and a straight aluminum flexible duct reduced the flow rates to 81.2 - 52.9% and less than 50%, respectively. The flow rate decreased with an increase of the bend angle of the flexible duct. Conclusion: It is recommended that flow rate check of a portable fan should be diligently carried out in every job site.

リンク情報
DOI
https://doi.org/10.1539/joh.16-0091-OP
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000399129800015&DestApp=WOS_CPL
ID情報
  • DOI : 10.1539/joh.16-0091-OP
  • ISSN : 1341-9145
  • eISSN : 1348-9585
  • Web of Science ID : WOS:000399129800015

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