Abstract
Performance of a ventilation system used to be evaluated only by air change rate. But now it is possible to evaluate it by ventilation effectiveness, which is determined by such conditions as the distribution of tracer-gas concentration and an air flow in a room. This paper describes the results we got from the field measurement of air change effectiveness (i.e. local mean age of air and local air change index). The measurement was carried out on three wooden detached houses equipped with different kinds of ventilation system. The results are as follows: (1) The value of local mean age of air (τ_<P1>), based on the definition of AIVC and measured by the step-up tracer-gas method, is twice to fifth times as large as the value got through the step-down tracer-gas method, because of the infiltration of the houses. (2) The value of local mean age of air (τ_<P2>), based on the definition of Sandberg, is nearly the same through both the step-up and step-down methods. (3) The spatial distribution of local mean age of air (τ_P) and local air change effectiveness is very large when a circulating fan is not operating, but when a fan is working the distribution of τ_P and ε_P is relatively small.
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