2002 Volume 27 Issue 84 Pages 31-41
The main object of HVAC system is to control room air temperature accurately. Because the signal transmitted from a room air temperature sensor governs the behavior of the overall HVAC system, it is important to obtain the precise dynamic behavior of indoor air temperature sensors. In our report time constant, which is fundamentaly used to express the dinamic response of the sensors, is considered as the value expressing the dynamic behavior. However, time constants of common indoor air temperature sensors used for HVAC control systems are unclear and not much research works were done. Therefore, in this report, time constants were cleared from the experimental reserach at a laboratory, and in an actual room. As a result, the time constants were recommend for the automatic control design. The non-liner heat transfer models were used to identify time constants which were discussed by comparing to ones obtained by experiment.
