暑暖領域における温熱感に及ぼす湿度の影響  [in Japanese] Influence of Environmental Humidity on Thermal Sensation of Warmth  [in Japanese]

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Abstract

体感温に及ぼす湿度の影響をみるために被験者実験を行い,その結果と人体の熱平衡式から算出される等温感線の特徴について検討した.椅座・裸体状態で実験を行い,"少し暖かい"と"暑い"と申告した時の,平均皮膚温とぬれ面積率の関係を観察した.その結果,温感申告値が等しい時,高湿・中湿・低湿環境で平均皮膚温とぬれ面積率はそれぞれ独自の値をとり,かつ,両者が一定の関係をもって変化していることを知った.この特性を熱平衡式に組み込んで得られる等温感線は,湿り空気線図上で微係数がいずれもマイナス値を示し,高湿ほどその微係数が大きく,低湿に移行するに従って微係数が小さい曲線となり,体感温に及ぼす湿度の影響が一定でないことがわかった.

Average skin temperature and skin wettedness were observed when man felt an equal thermal sensation of warmth. The experiments were carried out using young, healthy, male Japanese students to obtain the values of wettedness and average skin temperature in high-, middle-, and low-humidity environments when they felt an equal warmth. The experiments were conducted on sitting-reading subjects in a test chamber. The subjects were dressed only in athletic short and were exposed to warm conditions for one hour or so. From the analysis of our experimental data, the following conclusions were drawn regarding an equal thermal sensation. 1. Skin wettedness correlates positively with the vapor pressure and correlates negatively with the air temperature. 2. Skin wettedness correlates negatively with the evaporative heat loss from the skin surface. 3. There is a constant relation between skin wettedness and average skin temperature, when man feels an equal thermal sensation. In other words, an equal thermal sensation cannot be indicated merely at constant average skin temperature or at constant skin wettedness as PMV and ET^* define, but it can be determined rather at a constant condition where a kind of modified total of the average skin temperature and the skin wettedness remains constant. Under the above-mentioned condition, the theoretical line of equal thermal sensation obtained from the heat balance equation between the man and the environment is curved line, not a straight line, plotted on a psychrometric chart. The curved line of the sensation "very hot", for instance, shows a small slope down until approximately 50% relative humidity. When the relative humidity is less than 50%, the gradient of the line is steep, and the influence of the humidity on the thermal sensation becomes small.

Journal

  • Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan

    Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan 24(72), 67-74, 1999

    The Society of Heating, Air-Conditioning & Sanitary Engineers of Japan

References:  19

Cited by:  8

Codes

  • NII Article ID (NAID)
    110007996303
  • NII NACSIS-CAT ID (NCID)
    AN00065706
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0385-275X
  • NDL Article ID
    4640147
  • NDL Source Classification
    ZN5(科学技術--建設工学・建設業--都市工学・衛生工学)
  • NDL Call No.
    Z16-955
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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