衣服下への空気吹込みによる放熱促進効果

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書誌事項

タイトル別名
  • The Promotion of Heat Radiation with Air Blowing Under Clothes
  • イフク カ エ ノ クウキ フキコミ ニ ヨル ホウネツ ソクシン コウカ

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<p>  The heat transfer rate from a glass bottle containing hot water was measured, comparing the bottle to a human body, for the purpose of examining the promotion of heat radiation by blowing air under clothes. The bottle was wrapped tightly with a cotton cloth and covered with a clothes, with a 5 mm gap. Sweat water was supplied to the cotton cloth and air was blown into the gap. The heat transfer rate was determined from the decrease in the hot water temperature. The heat transfer coefficient between the cotton cloth surface and surrounding air was determined for the heat transfer without the sweat water supply. The heat transfer rate with the sweat water supply decreased with an increase in temperature of the surrounding air, but the rate for the high air velocity within the gap did not become zero when the temperature of the air became near that of the hot water. The evaporation rate at the cotton cloth surface, which was obtained from the latent heat transfer rate determined by subtracting the thermal heat transfer rate from the total heat transfer rate, was in proportion to the difference in the partial pressure of water between the cotton cloth surface and the surrounding air. The mass transfer coefficient was correlated with the air velocity within the gap. The temperature of the surrounding air for a given heat transfer rate from the human body was estimated using the heat transfer coefficient and the mass transfer coefficient. The calculated air temperature increases with the increase in air velocity within the gap, the decrease in the heat transfer rate, the decrease in air humidity and the increase in humidity at the surface of human skin. The heat transfer rate from the human body without blowing air under the clothes is not high enough in hot and arid regions or in areas in Japan with high humidity in summer, but the rate with the air blowing is enough in high temperature and humidity conditions.</p>

収録刊行物

  • 日本家政学会誌

    日本家政学会誌 68 (12), 662-673, 2017

    一般社団法人 日本家政学会

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