Heat Transfer Characteristics of Air Gap between Clothes for Thermal Function of Clothes

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  • 衣服の保温機能における衣服空隙の熱移動抵抗
  • イフク ノ ホオン キノウ ニ オケル イフク クウゲキ ノ ネツ イドウ テイコウ

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Heat transfer coefficients for various air gap widths between cloth and the side of a glass bottle surface were measured as a model for determining the effect of air gaps between clothes or cloth and the human body. Heat transfer resistance, which is in inverse proportion to the heat transfer coefficient of the air gap, increases with the increase in the air gap width for small air gap widths, but it levels off for large air gap widths. Heat transfer resistances of air gaps estimated from the radiation heat transfer coefficient and the convection heat transfer coefficient were in good agreement with those obtained by experiments. The calculated results indicated that the leveling off of heat transfer resistance at large gap widths comes from the radiation heat transfer coefficient which is independent of gap width. This indicates that radiation heat transfer resistance increases with the increase in the number of shields dividing an air gap. In other words the layering of clothes is effective in retaining heat due to the increase in radiation heat transfer resistance.

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