환기가 되는 강의실에서 천장형 에어컨의 풍량이 실내공기질에 미치는 영향

Ventilation is pivotal in terms of securing optimum indoor air quality(IAQ). In order to offer a comfortable environment to occupants in buildings, one must understand the role and impact of ventilation. In this paper, we experimented the local mean age of air for the airflow rate of the ceiling-type air-conditioner in the lecture room with ventilation system. A tracer gas of SF6 was injected in a supply duct using step-up method and tracer gas concentration was measured the lower parts of supply diffuser, exhaust diffuser, system air-conditioner at 9 internal points. According to the experiment results, local mean age of air was higher when system air-conditioner and ventilation system were operated together than when ventilation system was only operated.