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Air Leakage Calculation

This document provides equations to calculate air leakage due to room pressurization. It gives the variables for airflow rate, pressure difference, discharge coefficient, opening area, and air density. It then works through an example calculation to determine a leakage rate of 30L/s.

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MuhammedShafi
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3K views1 page

Air Leakage Calculation

This document provides equations to calculate air leakage due to room pressurization. It gives the variables for airflow rate, pressure difference, discharge coefficient, opening area, and air density. It then works through an example calculation to determine a leakage rate of 30L/s.

Uploaded by

MuhammedShafi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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CALCULATION OF LEAKAGE AIR DUE TO ROOM PRESSURIZATION.

Q=Cd * A * (2 ∆P/d) ^0.5 or

∆P=(d/2) * (Q/(Cd * A)) ^2

where ∆P=pressure difference across opening = 30 Pa

and Q=airflow rate, m3/s

and Cd=discharge coefficient for opening, dimensionless (0.6)

and A=cross-sectional area of opening, m2

and d = density of air, kg/m3 (about1.2 kg/m3)

Q =0.6 *0.007* (2 *30 /1.4) ^0.5 =0.027 10^-3m3/s

=27 L/S , 10% SAFETY

=30L/S

ASHRAE Fund.97, p25.11

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