Evaluation of Radiative Heat Transfer to Human Body in Indoor Space using Projected Area Factors for Each Part of Human Body : Part 1-Estimation of Projected Area Factors using Human Shape Model and Evaluation of Angle Factors for Closely Located Walls

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  • 人体各部の投影面積率を用いた室内空間における人体の放射受熱量評価に関する研究 : 第1報-人体形状モデルによる投影面積率算出と至近距離壁面との形態係数評価
  • ジンタイ カクブ ノ トウカゲメンセキリツ オ モチイタ シツナイ クウカン ニ オケル ジンタイ ノ ホウシャ ジュネツリョウ ヒョウカ ニ カンスル ケンキュウ(ダイ1ポウ)ジンタイ ケイジョウ モデル ニ ヨル トウカゲメンセキリツ サンシュツ ト シキン キョリ ヘキメン ト ノ ケイタイ ケイスウ ヒョウカ

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Abstract

The planning of living spaces under conditions of non-uniform thermal radiant fields requires a detailed analysis of radiative heat transfer to each part of the human body. However, at the same time, it is necessary to evaluate the characteristics of the thermal radiation environment for the entire space. This evaluation requires the computation of heat transfer to the entire body to provide an accurate distribution. Thus, an analysis method that is not computationally demanding has to be developed. The parallel projected area factor has been used as an analysis method of the angle factor between the whole human body and the surrounding walls. Compared with direct calculations of the angle factor of the differential areas of the body surface, this method significantly reduces computational effort. In this study, this method based on the projected area factor is extended to each part of the body by subdividing the whole body into 17 parts. This extension provides the evaluation of each part of the human body at a reduced computational load. However, this method needs a large number of photographs to develop a database of the projected area factors, and the angle factor may not be sufficiently accurate when the distance between the body and a wall is very small when the angle factor is calculated for the whole human body at once. In the present work, the databases are quickly developed using a 3D model of the human body. Moreover, it is confirmed that this subdividing method can be applied to closely located walls, for e.g., 0.5 m apart.

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