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Zhai, Yongchao; Zhang, Yufeng; Zhang, Hui; Pasut, Wilmer; Arens, Edward; Meng, Qinglin
Building and environment, August 2015, 2015-08-00, 20150801, Volume: 90Journal Article
The effects of air movement from ceiling fans on subjective thermal comfort and perceived air quality (PAQ) were examined for warm-humid environments. In a climate chamber controlled at three temperatures (26 °C, 28 °C and 30 °C) and two relative humidity (RH 60% and 80%), sixteen subjects (8 males and 8 females) dressed in summer clothing (0.5 clo) were exposed to 7 levels of air speed ranging from 0.05 m/s to 1.8 m/s. The subjects were asked to rate their thermal sensation, comfort, PAQ, air movement acceptability, humidity sensation, eye-dryness during the 2-h and 15 min long tests. Air movement significantly improves the subjects' thermal comfort, PAQ, and humidity sensation without causing dry-eye discomfort. Without air movement, the 80% acceptable limit established by the ASHRAE standard 55 was reached at 26°C/60%RH, 26°C/80%RH, and 28°C/60%RH. With air movement, more than 80% of the subjects perceived the environments acceptable at 28°C/80%RH, 30°C/60%RH, and 30°C/80%RH. The preferred air speeds for ceiling fans were in many cases higher than the limit specified in ASHRAE Standard, which is 0.8 m/s when users have no control over the fan. •We studied air movement and thermal comfort in warm-humid environments.•We obtained the acceptable range of temperature, humidity and air speeds.•Air movement improves thermal comfort and PAQ in warm-humid environments.
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