等しい温熱感を申告した時の平均皮膚温とぬれ面積率の関係に関する基礎的研究 [in Japanese] Fundamental Study concerning the Relationship between Average Skin Temperature and Wettedness When Man Feels an Equal Thermal Sensation [in Japanese]
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It is believed that in the hot environments, wettedness as well as average skin temperature reveals man's physiological condition accurately. With a purpose to investigate the relationship between average skin temperature and wettedness of man that feels an equal thermal sensation, the experiments were conducted on sitting-resting subjects in a test chamber. The subjects were dressed in athletic short and were exposed to warm conditions for one hour. The results obtained from the present experiments are as follows: 1) The evaporative heat loss from the skin surface correlates positively with the air temperature, while it correlates negatively with the environmental vapor pressure. 2) Wettedness correlates negatively with the air temperature and correlates positively with the vapor pressure. 3) Average skin temperature correlates positively with the air temperature and also negatively with the vapor pressure. 4) Evaporative heat loss correlates negatively with wettedness and correlates positively with average skin temperature. 5) Average skin temperature correlates negatively with wettedness. From the analysis of the present experimental data, the following conclusions were drawn regarding an equal thermal sensation. When subjects voted the thermal sensation "warm", the average skin temperature and the wettedness hold different values depending upon the different combination of ambient air temperature and environmental humidity. In other words, as the humidity gets higher, the average skin temperature goes down and the wettedness becomes larger. In addition a constant relation between average skin temperature and wettedness is observed. Upon calculating the gradients of five different environments from the observed experimental values, we obtained the results stated below. 1) All the gradient values indicate below zero. 2) As the environmental humidity goes higher the absolute value of gradient becomes smaller, and as the humidity lower, the absolute value bigger. It means that both experimentally and theoretically the locus of equal thermal sensation could not be a straight line. Rather it should be a curved line plotted on a psychrometric chart.
- Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan
Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan 24(72), 107-116, 1999
The Society of Heating, Air-Conditioning & Sanitary Engineers of Japan