Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/8216
Title: Effects of turbulent air on human thermal sensations in a warm isothermal environment
Authors: Xia, YZ
Niu, JL
Zhao, RY
Burnett, J
Keywords: Air movement
Draft sensation
Isothermal
Preferred velocity
Thermal comfort
Turbulent intensity
Issue Date: 2000
Publisher: Wiley-Blackwell
Source: Indoor air, 2000, v. 10, no. 4, p. 289-296 How to cite?
Journal: Indoor air 
Abstract: Air movement can provide desirable cooling in "warm" conditions, but it can also cause discomfort. This study focuses on the effects of turbulent air movements on human thermal sensations through investigating the preferred air velocity within the temperature range of 26°C and 30.5°C at two relative humidity levels of 35% and 65%. Subjects in an environmental chamber were allowed to adjust air movement as they liked while answering a series of questions about their thermal comfort and draft sensation. The results show that operative temperature, turbulent intensity and relative humidity have significant effects on preferred velocities, and that there is a wide variation among subjects in their thermal comfort votes. Most subjects can achieve thermal comfort under the experimental conditions after adjusting the air velocity as they like, except at the relative high temperature of 30.5°C. The results also indicate that turbulence may reduce draft risk in neutral-to-warm conditions. The annoying effect caused by the air pressure and its drying effect at higher velocities should not be ignored. A new model of Percentage Dissatisfied at Preferred Velocities (PDV) is presented to predict the percentage of feeling draft in warm isothermal conditions.
URI: http://hdl.handle.net/10397/8216
ISSN: 0905-6947
EISSN: 1600-0668
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