This paper examines the influence of the tracer gas on the accuracy of the single tracer gas decay method for measurement of interzonal airflow. The use of sulphur hexafluoride (SF6), nitrous oxide N2O) and carbon dioxide (CO2) is examined for measurement of airflow between two tightly sealed chambers and these measurements are compared with measurements made using a calibrated flowmeter. Tracer gas measurements made using SF6 were found to be in closer agreement with flowmeter measurements than those made using N2O or CO2.
AIDA is a basic infiltration calculation procedure intended for the calculation of air change rates in single zone enclosures. It also determines flow rates for up to 10 user defined openings and calculates wind and stack pressures. This program is very easy to use but, nevertheless, provides an accurate solution to the air infiltration flow balance equation. As its name suggests this is a development algorithm which may be readily adapted to include additional flow paths, mechanical ventilation and many other features.
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