Brookhaven National Laboratory (BNL) in the USA has developed a multiple tracergas technique called BNL/AIMS (Air Infiltration Measurement System) for determination of air infiltration rates. The technique is applicable in occupied dwellings and might be promising for wide-scale measurements. This paper discusses the main results of field measurements made by the Danish Building Research Institute with use of BNL/AIMS. The results obtained are compared with the results of parallel measurements made in the laboratory and by using computer controlled field measuring equipment.
The constant concentration tracer gas (CCTG) technique is typically used to measure air infiltration rates in mulitzone buildings. The measurements are performed by injecting metered amounts of a tracer gas into each zone so as to keep all the zones at a target concentration. One drawback to this method is that no information is gained about the level of interzone flow rates in the building. Modified constant concentration techiques are described which allow selected infiltration and interzone air flow rates to be estimated.
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