A transient pressurization method for measurements of airtightness
Journal article, 2007
By measuring the pressure decline in a pressurized air volume from which air is leaking it is possible to determine the air leakage rate as a function of the pressure difference. The leakage rate is proportional to the time derivative of the pressure. The formula, which is quite simple, accounts for temperature change of the air and volume change of the chamber. The derivation of the equation relating air leakage to pressure drop is described. Initial tests of the method have been performed and the derived equation shows good agreement with air leakage rates obtained by theoretical as well as standard steady-state methods.
heated room surfaces
orifice flow
air leakage
airtightness
fan pressurization
convection
general gas law
air infiltration
transient pressurization measurements
Author
Björn Mattsson
Chalmers, Civil and Environmental Engineering, Building Technology
Johan Claesson
Chalmers, Civil and Environmental Engineering, Building Technology
Published in
Journal of Building Physics
1744-2591 (ISSN) 17442583 (eISSN)
Vol. 31 Issue 1 p. 35-53Categorizing
Subject Categories (SSIF 2011)
Civil Engineering
Identifiers
DOI
10.1177/1744259107079021