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Journal of Building Physics
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A Transient Pressurization Method for Measurements of Airtightness

Björn Mattsson

Department of Civil and Environmental Engineering, Chalmers University of Technology, S-412 96 Gothenburg, Sweden, Bjorn.Mattsson{at}Chalmers.se

Johan Claesson

Department of Civil and Environmental Engineering, Chalmers University of Technology, S-412 96 Gothenburg, Sweden

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.

Key Words: fan pressurization • air leakage • airtightness • air infiltration • transient pressurization measurements • general gas law • orifice flow.

Journal of Building Physics, Vol. 31, No. 1, 35-53 (2007)
DOI: 10.1177/1744259107079021
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