Loci of Equal Thermal Sensation Line with Varying Characteristics of Mean Skin Temperature and Skin Wettedness

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  • SAKOI Tomonori
    Division of Urban and Environmental Engineering, Graduate School of Engineering Science, Hokkaido University
  • MOCHIDA Tohru
    Division of Urban and Environmental Engineering, Graduate School of Engineering Science, Hokkaido University
  • NAGANO Katsunori
    Division of Urban and Environmental Engineering, Graduate School of Engineering Science, Hokkaido University
  • SHIMAKURA Kazumi
    Division of Urban and Environmental Engineering, Graduate School of Engineering Science, Hokkaido University
  • KATADA Kenji
    Tokyo Gas Co. Ltd.

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Other Title
  • 平均皮膚温・ぬれ面積率と等温感線の形状
  • ヘイキン ヒフオン ヌレ メンセキリツ ト トウオンカンセン ノ ケイジョウ

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Mean skin temperature and skin wettedness are widely used as parameters in good relation to man's thermal sensation. It is said that mean skin temperature is closely related to the heat stress, and that skin wettedness is to the thermoregulatory strain. In the present research, the authors paid attention to mean skin temperature and skin wettedness when man felt constant thermal sensation and reanalyzed the results of 21 experiments in which 4 young naked male subjects under sitting-reading felt "equal warm sensation". All of these experiments were conducted in a still-air test chamber. From the characteristic change of mean skin temperature, skin wettedness and evaporation heat loss and development of formulae, the following concussions were obtained. 1. The observed and calculated differential coefficient of equal "warm" sensation line on the psychrometric chart shows all minus. The values indicate larger in the higher humidity environment and smaller in the lower humidity environment. 2. The effect of humidity on thermal sensation is larger under the higher humidity environment and it decreases with the shift to the lower humidity environment. 3. Under the environments where man feels an equal warm sensation, mean skin temperature and skin wettedness don't hold constant value but varied with the environmental conditions. The effect of wettedness on thermal sensation is larger under the higher humidity environment and less under the lower humidity environment. As the results, when man feels an equal thermal sensation, the change of mean skin temperature is larger under the conditions with larger skin wettedness i.e. under higher humidity conditions and is smaller under conditions with smaller skin wettedness i.e. under lower humidity conditions 4. In warm or hot environments, the locus of equal thermal sensation lines are close to constant skin wettedness lines under the high humidity environments and are close to constant mean skin temperature lines under low humidity environments. 5. (S)ET^* calculated actually evaluated the effect of humidity excessively.

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