A TRIPLE HOT-WIRE SYSTEM FOR INDOOR AIR-FLOW MEASUREMENTS

The application of a home made, triple hot-wire system in indoor air f low measurement is presented. Both the anemometer and sensor have been developed at Athens University with the aim to provide a reliable, re search tool of reasonable cost, simple construction, and satisfactory performance. All three velocity components above a threshold of 10 cm s(-1) can be measured. The system is also equipped with two thermomete rs for measuring the mean and fluctuating air temperature and for prov iding a means of temperature compensation of the hot wires' signal. Af ter evaluation of the system in the laboratory, it was used in the mea surement of the velocity profile of flows driven by the temperature di fference between two internal zones. The implied accuracy of the metho d allows for its integration with measurements of air volume exchange rates between internal zones, as estimated by tracer gas techniques.