Effects of Dynamic Airflow on Human Thermal Perception Under Hot Environment

Abstract

This study investigated the perceptual and physiological responses of 10 college-aged subjects to square wave airflows of different cycles (2 min, 10 min and 30 min) under different temperature levels (28 and 32 ). Main conclusions are as follows:(1) The mean pleasantness was highest in the condition of 32℃ air temperature with square-wave airflow (10-min cycle).(2) The mean thermal sensations reported by subjects were lower than corresponding PMV values, indicating the cooling effect of dynamic airflows on human thermal comfort in warm environment.

Effects of various environmental grades on thermal comfort in semi‐outdoor spaces

“…Previous studies exist in which subject experiments that simulated natural wind with an artificial climate chamber showed the relationship between airflow and thermal comfort 30,31 ; however, hardly any studies are available that clarified the relationship between air velocity and thermal comfort in the semi-outdoor environment while considering the difference in "expectations for the environment" in spatial characteristics. In this study, we combined the tendencies in the "breeziness" evaluation of the elevations with the correlation between air velocity and the pleasantness/unpleasantness for analysis and showed that the difference in the "expectations for airflow" in spatial characteristics impacted the correlation between air velocity and thermal comfort.…”