間接熱交換方式による温排水利用温室について

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タイトル別名
  • On the Utilization of Thermal Effluent for Greenhouse Heating by Means of Indirect Heat Exchange System
  • カンセツ ネツ コウカン ホウシキ ニヨル オンハイスイ リヨウ オンシツ ニ

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The cost of maintaining the desired temperature in winter is a principal element in the production of vegetables in greenhouse culture. Consequently, much lower costs of heat and more profitable operations will be possible if warm water from the condenser of a power plant can be used as the heat source for greenhouse heating.<br>In order to investigate the possibility of utilizing thermal effluent as the heat source of greenhouse heating, the experiments by a miniature greenhouse equipped with PVC-pipes as indirect heat exchangers were carried out (see Fig. 1).<br>The results obtained can be summarized as follows.<br>1. Under the conditions of warm water of 25.5°C and an outside air temperature of -6.8°C at calm clear night, air temperatures at inlet and outlet of the heat exchanger pipes in the greenhouse were 9.0°C and 16.5°C, respectively (see Fig. 2).<br>2. From an experimentally obtained relationship between the heat transfer coefficient and air speed in the pipes, the heat transfer coefficient at an air speed of 10m/sec was 2.5 times as much as that at 2m/sec (see Fig. 3).<br>3. From a theoretically obtained formula yielding required number of pipes for the model greenhouse utilizing thermal effluent, it was shown that 16 PVC-pipes, 23m long and diameter of 20cm, were required to maintain 12°C inside the greenhouse with thermal effluent of 25°C and an outside air temperature of -10°C (see Fig. 5, Fig. 6 and Fig. 7).

収録刊行物

  • 農業気象

    農業気象 33 (3), 149-154, 1977

    日本農業気象学会

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