When controlling the performance of a ventilation system it is important to investigate how the system works together with the building it ventilates. It is the performance of the complete system which is of interest, not its individual components. This paper describes the use of a computer-controlled, tracer-gas measuring system for controlling ventilation systems. By means of 4 measuring probes the condition of the air at the intake, room injection, room extraction and exhaust is registered.
Tracer gas concentrations are often analysed by using infrared spectroscopy. Infrared gas analysers have a fast response time and are accurate. Howener, this type of instrumentation is relatively expensive and can only be used for this type
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