Abstract
The total air infiltration rates can be determined by the decay tracer gas method. But to measure the influence of the inhabitants or the convective exchanges between rooms, the constant concentration is more suitable. In order to measure these effects, the Compact Equipment for Survey of Air Renewal (CESAR), developed at the LESO, was used to perform an air exchange analysis on data recorded at regular intervals in up to 10 locations simultaneously. Three tracer gas methods were implemented: decay, constant concentration and continuous flow. Successfull continuous measurements were worked out in 10 locations and the exchange flow rates as well as the inhabitants' effects were measured by the constant concentration method.
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