熱対流による空気循環を利用したパッシブソーラーハウスの実験的研究

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In a house facing to the south, it is usual that the solar radiation during the daytime in winter causes the large temperature difference between southern rooms and northern rooms. Northern rooms are often out of use because of their low temperature while southern rooms are at moderate temperature or are overheated. lf the passive technique is utilized for conveying the solar heat gain taken through the south-facing windows to the northern room, it may be expected that the temperature difference between the south and the north is decreased and that the thermal environment in the northern rooms is remarkably improved. In this investigation the air circulation due to natural convection is utilized as the technique for conveying the solar heat gain. It is studied here by comparative experiments using a tandem-type test house under the same climatic conditions, how the air circulation contribute to the increase of the air temperature in the northern rooms and what is the most suitable area of the channel for the air circulation. One test house, which is called "Air Circulation Type" is equipped with the air channel for circulation and another one, which is called "Ordinary Type" is not equipped with the channel. It has been confirmed beforehand that two test houses have the same air-tightness and that the indoor air temperature of them show the same value It each time in a day, when the air channel is completely blocked by flow dampers. When the air channel is opened, the effectiveness of the air circulation can be evaluated precisely by comoarative experiments using both types. The most suitable thickness of the air channel set in the north wall is examined by using various thickness of the air channely namely 1, 2, 5 (cm). In the case of thickness of 5 (cm), in which case the air volume of circulation is the largest among them, the air speed in the channel is about 40 (cm/s) in the daytime with solar radiation. In the nighttime the air speed is about 20 (cm/s) and the direction of the air flow is opposite to that in the daytime, because the heat loss from the south windows is larger than that flom the north windows in the night. The northern room air temperature in "Air Circulation TyPe" can be maintained 4 (degC) higher than that in "Ordinary TyPe" all day and is 8 (degC) higher than outdoor air temperature early in the morning. It may be concluded that this temperature difference between "Air Circulation Type" and "Ordinary TyPe" is due to the heat transport by air circulation and that this technique is useful to keep the northern room air temperature at higher level.
東京工芸大学の論文

熱対流による空気循環を利用したパッシブソーラーハウスの実験的研究

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