温室暖房用熱サイフォン式ヒートパイプの性能

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The solar greenhouse is an effective method for saving oil and is being examined by many investigators. The long-term heat storage system is desirable for a stable heat supply in winter. We have investigated the performance of a system which stores solar energy under ground during the summer and which uses the stored energy for greenhouse heating during the winter. The thermosiphon heat pipes made of copper tube (1200×25.4mm) have been used to facilitate the heat transfer from the ground at about 1m in depth, to the greenhouse during winter. The performance of this system with heat pipes containing Freon 113 or water as a working fluid was studied at the laboratory, and at the greenhouse. The results obtained are as follows : 1) The rate of heat transfer is increased by increasing the temperature difference between heating and cooling mediums, and the cooling water flow rate. The water heat pipe shows a better performance than the Freon heat pipe. 2) The rate of heat transfer from a heat pipe installed in the ground is approximately 1W. The rate of heat input to the heat pipe calculated from the ground temperature gradient is a little larger than the rate of heat transfer. 3) A better performance of the greenhouse heating may be expected by decreasing the heat transfer resistances at the outer surface of the heat pipe. The performance of the heat pipe rises with a lower atmospheric temperature, that is, the heat transported by the heat pipe increases during the period of low air temperature in the greenhouse.
神戸大学の論文
1983-01-30

温室暖房用熱サイフォン式ヒートパイプの性能

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