Prediction Method of Radiant Environment in a Room and its Application to Floor Heating

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  • 室内ふく射環境の解析法の開発と床暖房への適用
  • シツナイ フクシャ カンキョウ ノ カイセキホウ ノ カイハツ ト ユカ ダ

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Abstract

This paper describes the prediction method of radiant environment in a room, in which the radiation interaction between human bodies and their surroundings is focused on. An arbitral complicated configuration in a three dimensional enclosure with human bodies, window and furniture in the room can be applied for this prediction method. A unique space index and another surface index are introduced to specify the geometry of solid body or surface in the room. In order to introduce the zone method, total exchange areas are calculated by the transformation from direct interchange areas which can be obtained by the Monte Carlo method. Energy balance equations associated with thermal radiation, convection, wall conduction and air ventilation are formulated at total number of divided areas. These non-linear equations can be solved by the combination of Newton-Raphson and Gauss-Seidel methods. A thermal human body model with some parameters of skin temperature and clothing is proposed to simulate its heat release and to predict a local thermal sensation around the body. Thermal radiant environments in a meeting room with floor heating panel are analyzed by the prediction method and checked in the case of sitting human bodies. Radiant asymmetry effects may be derived from the different irradiation and evaluated in terms of the direction and the position of this human body model.

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