The 50 Pa rating is based on the blower door pressure test. Actual pressure differences under normal conditions tend to avarage at about 1-2 Pa. Maybe you can find a CEN norm that defines a good pressure dP to assume for annual energy simulations. Or check the mathematical referance for the other infiltration types, because they often also reference standards and norms. If I find anything, I'll post it.
Sent from my iPhone Say I want to simulate a passive house in TRNSYS using type 56. For an airtight building shell, passive house infiltration should be say ≤ 0.6 ACH @ 50 pascal pressure.
(http://www.passivehouse.us/passiveHouse/PassiveHouseInfo.html)
The type 56 TRNBLD units for infiltration; are they at static or at 50 pa? If they are at static, I need to divide 0.6 by ~ 20 (estimate from Sherman 1987), so I input Airchange = 0.03 1/hr. Correct? Cheers,
Marcus -- Marcus Jones, M.Sc., LEED®AP BD+C
Freelance energy consultantVienna, Austria
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