HVAC Pressurisation Calcs
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Sheet1JOB REF:Client:
HVAC Pressurisation CalculatorConversions and Formula ResultsLengthWidthHeightWhat is the size of the "room" to be pressurised 4m2.5m3m30m330000Litres
What is the pressure we require in the "room"?50PA0.200932326Inches H20
How many air changes do we require?12Per Hour
Vent Size?200mm200mm40000mm2How Many Vents?2QTY80000mm20.8611128333sq ft
Q = 2610 x A x (DP)1/2 (Q is "Leakage" Rate) Source: ASHRAE 1999 Applications (Ch. 51.5)225.7981529305cfm
We need to deliver106.1251318773Litres per second to maintain a pressure of 50PA in the "room" with the vents specified
This equates to 12.74Air ChangesAcceptable?NO!YES!Additional Info Calc
If the HVAC supplier supplies135L/secThe pressure in the house will be63.6041612443PAgiven the dims of the house and vents
12Air Changes Per Hour Requires100L/Secthroughput
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