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Proceedings of ASim Conference 2012: 1st Asia conference of IBPSA-China, Japan, Korea

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Strategy of interior color and thermal storage for insulated house in cold region

Taro Mori, Kousuke Ogata, Kouji Takemasa, Masamichi Enai

Abstract: Increasing environmental awareness, higher costs for energy use contributed significantly to the expansion of building passive house. On the other hand, the economic crisis spread around the world. Therefore it is very hard for general people to built high performance house with PV system, solar hot water supply system, HEMS and so on. Direct solar gain technique is very simple and inexpensive idea for passive heating. Although, large window for direct solar gain cause huge heat loss, also there is the possibility to escapes solar radiation from large window in some case that the absorption rates of inner surface are low. That is why, we, researcher, architects, customer, needs the method for evaluating the effects of direct solar gain with colour pattern of walls and thermal storage in a room on a thermal environment. In this paper, we propose the method to calculate solar absorption on inside walls by using Radiance. The results of detached house in memuro-cho, Hokkaido, indicates that the solar absorptions on the west walls and floors are bigger than other walls because of the position of window. It helps to decide the colour of walls and the position where heat storage install on. Also, we defined the Effectiveness of Direct Solar gain to evaluate how much solar radiation effectively used for passive heating. The relation between the value and the area of black wall indicates that high absorption rate on the floor is effective on direct gain technique. Also, there is the correlation between the solar absorption and the Effectiveness of Direct Solar gain. It saves time and computer resource, the calculation for solar absorption takes much time because of many images for the calculation, by predicting the tendency of solar absorption by using the Effectiveness of Direct Solar gain. * Corresponding author email: mori.taro@eng.hokudai.ac.jp
Pages: 102 - 109
Paper:
asim2012_0026