Pressure Loss Coefficient - Tee
Pressure Loss Coefficient - Tee
(OP)
I have looked into the minor loss coefficient of ASHRAE booklet (miss pages), unfortunately I couldn't find anything on an open chamber pressure loss (see attached drawing).
Only one fan would operate at one time and the flow will diverge into two. I understand that to analyze the pressure losses in the two bends and in the chamber, you cannot treat them as only 2 elbows because the flow isn't directed and split into two streams smoothly by ducts.
Anyone has any idea to approach this pressure loss analysis?
Only one fan would operate at one time and the flow will diverge into two. I understand that to analyze the pressure losses in the two bends and in the chamber, you cannot treat them as only 2 elbows because the flow isn't directed and split into two streams smoothly by ducts.
Anyone has any idea to approach this pressure loss analysis?





RE: Pressure Loss Coefficient - Tee
Then the ducts are treated as a Plenum to rectangular contraction (ASHRAE SR1-1)
Anything else means you are trying to model a bullhead tee, which isn't good news.
RE: Pressure Loss Coefficient - Tee
I agree with you that the open chamber shall be treated as a plenum and SR1-1 coefficient can be used for the loss from the chamber to the narrow passages.
But I can't find anything on duct---> plenum in my ASHRAE copy. Would ER4-1 be a close one?
Can it be treated as a sudden enlargement? I suspect not because the flow would not be in one direction when it enters the chamber and become turbulent.
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