人们80%以上的时间在室内度过，而调查显示，室内的热舒适指标(TCI)和室内空气品质(IAQ)仍远没达到健康、舒适的要求。
People typically spend over 80 percent of their time indoors where, however, is far from health and comfort in terms of thermal comfort index (TCI) and indoor air quality (IAQ).
另一方面，为了改善室内空气品质，通风负荷随空调系统新风量的增大而增加。
On the other hand, in order to improve indoor air quality, ventilation loads are increasing as following as fresh air supply rates are becoming greater.
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