Calculate Pressure Drop of Air Across an Opening

AI Thread Summary
To calculate the pressure drop of air across an opening, the characteristics of the opening, such as its type and dimensions, are crucial. In this case, the opening is a louvred roller door with small rectangular perforations. The flow rate of 3,000 L/s and the free area of 80% affect the velocity, which increases from 0.4 m/s to 0.45 m/s. Understanding the specific design and testing the opening can provide more accurate pressure drop calculations. Accurate data on the opening's characteristics is essential for determining the pressure drop effectively.
Futsal1st
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How do I determine the pressure drop of air across an opening? For example if I have 3,000 L/s (3 m3/s) and an opening of 8.4 m2 I know the velocity is 0.4 m/s. If the free area is 80%, the velocity increases to 0.45 m/s. What I'd like to cal is the pressure drop in each case.

Cheers
 
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It would depend on the characteristics of the opening. Is it a louver of some sort? Can you test it?
 
Its a louvred roller door.
 
Is it pre-manufactured? Can you look up its characteristics? And you didn't answer my other question...
 
Sorry 'bout that.

Its a car park roller door that has small openings (almost rectangular)about 5mm high and 50mm long. It acts like a perforated panel between the outdoor and the car park.
 

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