Effect of Different Clothing Ensembles on Correlation between SET^* and Japanese Thermal Sensation

DOI Web Site 3 Citations
  • ITO Hiromu
    Technology Research Center, Taisei Corporation
  • FUKAI Kazuo
    Department of Architecture and Building Sciences, Yokohama National University
  • GOTOH Shigeru
    Department of Architecture and Building Sciences, Ashikaga Institute of Technology

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Other Title
  • 着衣量の異なる場合のSET^*と温熱感覚に関する実験的研究
  • 着衣量の異なる場合のSET※と温熱感覚に関する実験的研究
  • チャクイリョウ ノ コトナル バアイ ノ SET ト オンネツ カンカク

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The purpose of this study is to investigate the effect of different clothing ensembles on the correlation between SET^* and Japanese thermal sensation, and verify the effectiveness of SET^* as a thermal sensation index. Experiments were conducted in summer and winter under the following conditions. Four different clothing ensembles, including summer and winter clothing, were used in the experiments. The clo values calculated by total weight of the ensemble were 0.56, 0.57, 0.74 and 0.89clo for the male, and 0.42, 0.46, 0.76 and 0.88clo for the female. The air velocity in the test chamber was less than 0.2m/s and the relative humidity was 50%rh. The chamber's surface temperatures were controlled to keep mean radiant temperature equaled to the air temperature ranging from 17 to 31℃. Four male and four female subjects were exposed to 27 different conditions ranging from 16 to 31℃ SET^* for about 1 hour. Metabolic rate on the experimental condition (sedentary and keep quiet) was judged at 0.8met. The main results are shown as follows. 1) In both summer and winter, the significant correlation was found between SET^* and the whole body temperature sensation for each clo values. 2) The seasonal difference and the clothing difference were not found in those regression lines. Therefore, SET^* is useful in predicting the whole body temperature sensation for different clothing ensembles (0.42〜0.89clo). 3) The zone of thermal neutrality with temperature sensation votes ranging from 4: slightly cool to 6: slightly warm was around 22〜26℃ SET^* from total 432 observations. This zone coincided with the comfort range reported in ASHRAE St. 55-74 (22.0〜25.4℃ SET^*). 4) The seasonal difference was found between the whole body temperature sensation and the other sensations (the sense of discomfort and the sense of satisfaction). However, under the thermal neutrality, more than 80% of subjects felt the least uncomfortable and satisfactory.

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