个性化送风波动对热感觉和室内空气品质的影响

Impact of airflow fluctuation on human thermal comfort and indoor air quality in a personalized ventilation system

为了解个性化通风环境下波动风对人体热舒适和室内空气品质的影响,在系统中实现传统的稳态送风和频率分别为0.1、0.2、0.3Hz的波动送风。采用受试者的主观感受和示踪气体测量两种方式,比较了这几种送风对改善室内热环境和空气品质的效果。实验表明:室温28℃时,个性化通风下人体最喜爱的送风波动频率为0.2Hz。该频率的波动风相对于稳态风有更强的冷却作用,并且该波动风不会降低吸入空气的品质。

The impact of fluctuating airflow on human thermal comfort and indoor air quality was investigated using three periodically fluctuating airflows with frequencies of 0.1, 0.2 and 0.3 Hz along with constant velocity airflow in a personalized ventilation system. The test room had an air temperature of 28 ℃ with a personalized air temperature of 25 ℃ during the test period. Subjective evaluations selected the airflow with a frequency of 0.2 Hz as the most preferred out of the three fluctuating airflows. The subjects also had the same level of thermal comfort and perceived air quality when they are separately exposed to the constant airflow and the preferred fluctuating airflow (0.2 Hz). Both subjective results and tracer gas measurements indicate no difference in the perceived air quality, but the lower mean velocity with the fluctuating airflow indicates that the fluctuating airflow has stronger cooling effect than the constant airflow. 