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Title: Indoor environmental effects of vertical air temperature gradients in displacement ventilated spaces in the tropics
Keywords: Temperature gradients, displacement ventilation, local thermal sensation, local thermal comfort, perceived air quality, tropics.
Issue Date: 20-Mar-2007
Citation: YU WEIJIANG (2007-03-20). Indoor environmental effects of vertical air temperature gradients in displacement ventilated spaces in the tropics. ScholarBank@NUS Repository.
Abstract: The restriction on temperature gradient beyond 3 K/m in current standards limits the heat- removing capability of a displacement ventilation system. The findings from this study demonstrate that temperature gradients have different influences on thermal comfort at different room temperatures and overall thermal sensations. Tropically acclimatized subjects accepted temperature gradient as high as 5 K/m at room temperatures in the range of 23 to 26oC as long as they were maintained at thermally neutral state. This finding is an extension of Olesen et al (1979)a??s work in which 5% occupants felt thermal discomfort at 3 K/m gradient. It was found that room air temperatures have greater impact than temperature gradients on local thermal sensation and comfort. Thermal gradients have no significant impact on perceived air quality and sick building syndrome. Correlation of overall thermal sensation with local thermal sensation in a space served by a displacement ventilation system was established. The chart of percentage dissatisfied versus Standard Effective Temperature (SET*) was developed to predict the percentage dissatisfied with overall body and any segment in displacement ventilated spaces in the tropics.
Appears in Collections:Ph.D Theses (Open)

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