| 温室の地中熱交換暖房に対する一考察. Some Proposals for Greenhouse Heating with Soil-Air Heat Exchange System | |||||||||||||
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| トマトを地中熱交換暖房のビニルハウスで栽培し, 冬期間にその熱収支を調査した.晴天日の集熱量は, ハウス内作物上の全日射の40%程度であった.また潜熱量は集熱量の約50%, 放熱量の約15%を占めたが, 露点以下でパイプ内部に結露した水滴は, 夜間の放熱量に顕著な影響をおよぼさなかった.地温の日較差はパイプ外表面から離れるに従って減少し, パイプから15.5cm離れた地点で日較差1.2℃となった.パイプの長さに関しては, 本実験では18mとしたが, この長さでも熱交換器として有効であることがわかった.. Tomato plants were grown in the greenhouse by heating with a soil-air heat exchange system. In order to increase the efficiency of this system, heat balances were examined throughout winter. The amount of collected energy on a sunny day seemed to deserve about 400f the total solar radiation on the plant top. Although overall latent heat was 501024661404f collected heat energy and approximately 151024110400f released one, water drops formed on the inner surface of the heat exchange pipes below dew point during heat collection had negligible effect on the amount of released energy at night. A diurnal range of soil temperature decreased with increasing distance from the outer surface of the pipe, the difference being 1.2℃ at a distance of 15.5cm. In terms of the length of the pipe, it was found that even a 18 metres long pipe employed in the present experiment had an appreciable capacity for the heat exchanger. | |||||||||||||
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