Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.buildenv.2005.09.003
Title: Thermal effect of temperature gradient in a field environment chamber served by displacement ventilation system in the tropics
Authors: Yu, W.J.
Cheong, K.W.D. 
Tham, K.W. 
Sekhar, S.C. 
Kosonen, R.
Keywords: Air temperature
Displacement ventilation
Overall thermal sensation
Temperature gradient
Tropics
Issue Date: 2007
Source: Yu, W.J., Cheong, K.W.D., Tham, K.W., Sekhar, S.C., Kosonen, R. (2007). Thermal effect of temperature gradient in a field environment chamber served by displacement ventilation system in the tropics. Building and Environment 42 (1) : 516-524. ScholarBank@NUS Repository. https://doi.org/10.1016/j.buildenv.2005.09.003
Abstract: The effect of vertical air temperature gradient on overall and local thermal comfort at different overall thermal sensations and room air temperatures (at 0.6 m height) was investigated in a room served by displacement ventilation system. Sixty tropically acclimatized subjects performed sedentary office work for a period of 3 h during each session of the experiment. Nominal vertical air temperature gradients between 0.1 and 1.1 m heights were 1, 3 and 5 K/m while nominal room air temperatures at 0.6 m height were 20, 23 and 26 °C. Air velocity in the space near the subjects was kept at below 0.2 m/s. Relative humidity at 0.6 m height was maintained at 50%. It was found that temperature gradient had different influences on thermal comfort at different overall thermal sensations. At overall thermal sensation close to neutral, only when room air temperature was substantially low, such as 20 °C, percentage dissatisfied of overall body increased with the increase of temperature gradient. At overall cold and slightly warm sensations, percentage dissatisfied of overall body was non-significantly affected by temperature gradient. Overall thermal sensation had significant impact on overall thermal comfort. Local thermal comfort of body segment was affected by both overall and local thermal sensations. © 2005 Elsevier Ltd. All rights reserved.
Source Title: Building and Environment
URI: http://scholarbank.nus.edu.sg/handle/10635/45878
ISSN: 03601323
DOI: 10.1016/j.buildenv.2005.09.003
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