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 0.05m/s to 1.8m/s. The subjects were asked to rate their thermal sensation, comfort, PAQ, air movement acceptability, humidity sensation, eye-dryness during the 2-hand 15min 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 0.8m/s when users have no control over the fan.
|Titolo:||Human comfort and perceived air quality in warm and humid environments with ceiling fans|
|Data di pubblicazione:||2015|
|Appare nelle tipologie:||2.1 Articolo su rivista |