More than two months of detailed test data have been gathered using modified constant concentration tracer gas techniques for a six-storey, 60 apartment, multi-family building. Weather, and interior conditions in the building were part of the data set. Because of occupant effects, large changes in air exchange rates were observed, often over short time period. The test apartment allowed us to evaluate the influences of weather alone with the added feature to employ controlled window openings.
Measurement methods based upon multiple tracer gas techniques have become an established branch of the study of air infiltration and interzonal air movements. Three general groups of techniques have emerged, namely constant concentration, constant emission, and decay. Of the decay type group of techniques, several methods of deriving airflows from measured concentration/time curves have been suggested.
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