Theoretical and empirical considerations on the effect of solar radiation on a clothed body

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  • Kato Yuta
    Graduate School of Life and Environmental Science, Kyoto Prefectural University
  • Nagano Kazuo
    Graduate School of Life and Environmental Science, Kyoto Prefectural University
  • Watanabe Shinichi
    Department of Architecture, Daido University

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Other Title
  • 着衣人体に対する日射の影響の理論的・実証的考察
  • チャクイ ジンタイ ニ タイスル ニッシャ ノ エイキョウ ノ リロンテキ ・ ジッショウテキ コウサツ

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Abstract

<p>This study estimated the net solar absorptance and transmittance of clothing ensembles using the absorptance, reflectance and transmittance of each single garment based on the net radiation method, and compared them with the measured results. Additionally, a part of the solar heat absorbed by the clothing should be released back to the skin, although the previous studies have assumed that all of them were transferred to the surroundings. This study derived the heat balance equation taking into account the re-released heat and body segment differences and examined its validity through the measurements using a thermal manikin at the outdoor environments. The results showed that the manikin absorbed less than 70 % of the solar radiation, which was supposed to be absorbed theoretically, while the estimated solar absorptance and transmittance corresponded closely to the measured values. This ratio can be useful to evaluate realistically the solar effect on the human body, and was defined as the solar efficiency factor of clothing. Consequently, it is expected that the net solar absorptance of clothing ensembles and the new defined factor would improve the evaluation of outdoor thermal effects on the human body.</p>

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