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bibin777
28-06-2009, 08:08 AM
hai Friends:p
I want to know about Duct Fittings Loss Coefficients. Normaly i am collecting all data from ASHARE hand book but i need one easy formula any body can help this problem???????

nike123
28-06-2009, 08:15 AM
I also want many, many things.
Most of them I got when I say "please" (http://en.wikipedia.org/wiki/Magic_word).

bibin777
28-06-2009, 09:04 AM
hallo friends
Actully i dont know more things about SP Calculation But i Made One Exel Sheet For SP Calculation. any way i will upload that exel sheet please try and tell me commands. In Straight Duct Pr. loss You Can Calculate from Air flow (cfm),Duct size(width" & height") & Duct Length. , And another section for duct fittings (Elbow,Transition, grills, diffusers, branches,Tee .etc. .....) you must put cfm,sizes and loss coefficients ( loss coefficients you calculate from ASHARE Hand book) Please Try AND tell Me the Commends

nike123
28-06-2009, 09:48 AM
I am not aware of any formula which will give you fitting pressure loss.
You must fill your Excel sheet with all equivalent lengths for all possible fittings and then choose between them when calculating.

Or you could use specialized software like Autodesk Revit MEP which makes all calculations while you are drawing ducts.

bibin777
28-06-2009, 10:07 AM
thanks nike!!!!, i have that equivalent length methods. but somebody talled me more accurate calculation is this one that means i am serching loss coeiff. formulas

nike123
28-06-2009, 10:11 AM
http://www.coolit.co.za/DuctView/index.htm

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V1T-3VGCTCB-8&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=941837260&_rerunOrigin=google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=17fdefa88dab0c72e2d2794e12ed26b8

http://www.airah.org.au/Content/NavigationMenu/Publications/TechnicalPublications/default.htm

nike123
28-06-2009, 10:30 AM
http://www.hvactools.net/products/ashrae-duct-fitting-database-cd-version-50000-9781933742380-210-8910-08.shtml

bibin777
28-06-2009, 10:44 AM
hi nike123
i check this site this is useful for me
thanks

bibin777
29-06-2009, 06:59 AM
hallo friends,
i have 1997 ASHARE Hand Book Duct Design(Chapter 32) any Body WANTS that Please sENd PM