Air movement and thermal comfort in hot-humid environments (1): Without occupant control

Experiments on the thermal responses of 16 subjects from China exposed to the environment with fixed air movement from ceiling fans at three levels of temperature (26, 28, 30 ℃) and two levels of relative humidity(RH) (60% and 80%) by questionnaire. Results show that the air movement from fixed ceiling fan can markedly improve occupant comfort in hot-humid environment, and the thermal comfort can be maintained up to 30 ℃ and 80%, and the preferred air speed increases while air temperature and humid improves. The maximum preferred air speed is 1.6 m/s，much higher than the upper limit by ASHRAE Standard 55.