mjkey
Mechanical
- Aug 8, 2016
- 8
Hi all,
I have a question regarding the "pressure" value for the duct leakage equation below (I've copied and pasted this from a paper I was reading):
Qleak = C · As · ∆ p0.65
Qleak is the quantity of leaked air,
C is a constant related to the duct tightness (which relates to the details of manufacture, installation and sealing),
As is the duct surface area,
∆p is the pressure difference between the inside and outside of the duct
They say the delta P value is the pressure difference between the inside and outside of the duct. But the pressure along a duct system varies (rises or drops depending on supply or exhaust). Say at the fan outlet, the pressure is 500Pa and at the index run diffuser outlet, it is say 40Pa. So what delta P value should we be using to determine the maximum Qleak air leakage rate?
Can someone please explain how to use this equation properly, particularly how to determine the delta P value.
Thanks.
I have a question regarding the "pressure" value for the duct leakage equation below (I've copied and pasted this from a paper I was reading):
Qleak = C · As · ∆ p0.65
Qleak is the quantity of leaked air,
C is a constant related to the duct tightness (which relates to the details of manufacture, installation and sealing),
As is the duct surface area,
∆p is the pressure difference between the inside and outside of the duct
They say the delta P value is the pressure difference between the inside and outside of the duct. But the pressure along a duct system varies (rises or drops depending on supply or exhaust). Say at the fan outlet, the pressure is 500Pa and at the index run diffuser outlet, it is say 40Pa. So what delta P value should we be using to determine the maximum Qleak air leakage rate?
Can someone please explain how to use this equation properly, particularly how to determine the delta P value.
Thanks.