A Proposal for Revisions of ISO-7933 and ISO-11079

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  • ISO-7933およびISO-11079の改訂に向けての一提案
  • ISO 7933 オヨビ ISO 11079 ノ カイテイ ニ ムケテ ノ イチ テイアン

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It is important to clarify the applicable range and the characteristics of thermal indices for designing and evaluating a thermal environment. In this paper, from the viewpoints of thermal physiology, two indices stipulated by ISO, i.e., ISO-7933 for hot environments and ISO-11079 for cold-environments based on thermal equilibrium of the human body, were verified. The human model on ISO-7933 expressed in a linear multiple regression formula cannot always indicate the relationship between thermal physical states and sweat secretion in man. Therefore, this paper proposes that the sweat rate should be evaluated based on the thermal physiological state rather than the thermal equilibrium remainder. In addition, in order to make a new index based on the ISO-7933 concept, which deals with heat storage and dehydration as a measure for evaluation, the authors propose to deal with increase in body enthalpy and sweat secretion as they simultaneously occur. In an analysis of ISO-11079, a similarity is seen between IREQ (Required Clothing Insulation) for general cooling and the WCI (Wind Chill Index) for local cooling in outdoor environments from the viewpoint of thermal physiological engineering interpretation. Considering the scope of application of WCI stated in ISO-11079, it is proposed that thresholds of locally unpleasant or critical states be applied as the values for skin temperature in WCI calculations.

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