- #1
alpha754293
- 29
- 1
Stupid question:
I have the following pipe configuration:
Working fluid = ambient air
Pipe1 = 6 inch ID x 24 inch length
Expansion1 = 2 inch length
Pipe2 = 8 inch ID x 2 inch length
Fan1 = assume 200 CFM @ 2860 rpm, 0.05 inH2O
Contraction1 = 2 inch length
Pipe3 = 6 inch ID x 12 inch length
Butterfly valve, 50% open
Pipe4 = 6 inch ID x 12 inch length
Question:
Does it matter whether the butterfly valve is downstream of the fan or upstream of the fan?
(e.g. Pipe1 --> Expansion1 --> Pipe2 --> Fan1 --> Contraction1 --> Pipe3 --> Butterfly valve --> Pipe4
Or
Pipe1 --> Butterfly valve --> Expansion1 --> Pipe2 --> Fan1 --> Contraction1 --> Pipe3 --> Pipe4)
Discuss/prove your work/answer please.
(I tried modelling it with a 1D pipe flow program and I don't know if I am doing it right. And before I go and spend a significantly longer amount of time building the 3D model, I would like to know what the expected value should be for a problem like this. Thanks.)
I have the following pipe configuration:
Working fluid = ambient air
Pipe1 = 6 inch ID x 24 inch length
Expansion1 = 2 inch length
Pipe2 = 8 inch ID x 2 inch length
Fan1 = assume 200 CFM @ 2860 rpm, 0.05 inH2O
Contraction1 = 2 inch length
Pipe3 = 6 inch ID x 12 inch length
Butterfly valve, 50% open
Pipe4 = 6 inch ID x 12 inch length
Question:
Does it matter whether the butterfly valve is downstream of the fan or upstream of the fan?
(e.g. Pipe1 --> Expansion1 --> Pipe2 --> Fan1 --> Contraction1 --> Pipe3 --> Butterfly valve --> Pipe4
Or
Pipe1 --> Butterfly valve --> Expansion1 --> Pipe2 --> Fan1 --> Contraction1 --> Pipe3 --> Pipe4)
Discuss/prove your work/answer please.
(I tried modelling it with a 1D pipe flow program and I don't know if I am doing it right. And before I go and spend a significantly longer amount of time building the 3D model, I would like to know what the expected value should be for a problem like this. Thanks.)
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