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Interaction of Duct Fittings
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Source：Internet Author：Unknow Pubdate：2010-06-17
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arcenas (Mechanical)
16 Jun 10 22:35
Hi! Could somebody help me regarding this?
All of the data on loss coefficients are based on fully developed flow of air into the fittings ( free stream loss coefficient ). Air leaving fan, elbow, tee or any duct fittings is always turbulent and distorted. You actually need a certain length ( 5 to 10 dia in duct lenght ) for the flow to fully develop. If the air flow does not become fully developed the pressure drop of the downstream fittings will generally increased including noise.
I am actually looking for methodology / reference or books that tells you how to calculate or compensate for fittings installed very close to each other. Using the loss coefficent for fully develop flow is inaccurate.
I have tried ASHRAE and It does not tell you about this problem.
Thank you
berkshire (Aeronautics)
16 Jun 10 23:15
字串2
Try this book, it is now available in paperback.
http://www.bizrate.com/technology-books/flow-and-fan-principles-of-moving-air-through-ducts-by-charles-harold-berry-(paperback-books-on-de--pid1016659188/
B.E.
（Click：）
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