Static Pressure Loss of Duct Fitting

[Zimmy242]

I am trying to find a calculation or program to find the static friction loss of a expanding wye duct fitting. I've seen some charts on it, but I would like one that I can manipulate to work for many sizes. Does anyone know where to look for that?

 

[pierreick]

Hi,
Consider these resources to support your work.

Druckverlust.online

Good luck,
Pierre

 

[Snickster]

The attached is a study of converging fittings that puts coefficients into equation form which may be what you are looking for. This is referred to in the also attached McGill Duct design Guide page A-66.

"The negative loss coefficients of certain fittings are derived from experimental data. Note that two separate test programs produced consistent data: "An Experimental Study of the Pressure Losses in Converging Flow Fittings Used in Exhaust Systems," C.F. Sepsey and D.B. Pies, The Ohio State Research Foundation, 1972; and ASHRAE Research Project 551-TRP, "Laboratory Study to Determine Flow Resistance of HVAC Duct Fittings."