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Air losses as pressure rises

thread1043-468762

Air losses as pressure rises

Air losses as pressure rises

(OP)
Looking for some advice on an air loss problem
I'm told that when performing a 'leak test' on a house, at 50pascals (0.2in of h20), every square inch that isn't sealed results in 10 CFM of airloss. (that is if the house is pressured up to be 50 pascals above the ambient pressure around the house)
Is this linear? Exponential?
If the house were pressured up 10x to 500pa, how much air loss would be caused by a 1 square inch hole? Is it just 100cfm?
Appreciate the help!!

RE: Air losses as pressure rises

No, flow through a hole is not linear with dP. In most cases it approaches to be linear with the square of the flow - but its the velocity squared - and since most likely you have many leaks it gets more complicateds.

Best regards, Morten

RE: Air losses as pressure rises

Apply Bernouilli's equation for compressible fluids. You'll have your answer.

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