| 摘要 |
<p>PURPOSE:To economically and safely heat a greenhouse for the purpose of agriculture and the like, utilizing underground water, by heating the water to heat a greenhouse, by feeding the underground water to the heat-absorbing side of a heat pump to expand and vaporize a heating medium, and to compress and liquefy it at the radiating side. CONSTITUTION:A circulation system for heating water to heat a greenhouse is arranged in such a manner that heat radiating pipes 2, composed of fin pipes, are arranged to the under side of a greenhouses 1 and 1' in zigzag state, and their inlets and outlets are connected to the raditating side of a heat pump 3 installed to the outside of a greenhouse. Solenoid-operated valves 5 and 5' to control circulation of said water which is for a circulating pump 4 and for each heat radiating pipes 2, are provided to the circulating system. The underground water is fed into the heat-absorbing side of a heat pump 3 by a pump 7 through an underground pipe 6, and here, the underground water with its heat removed is returned to the underground through a return pipe 8. With such an arrangement, the heating medium in a heat pump 3 is expanded and vaporized, by utilizing the underground water, and the above-mentioned water is heated by the radiated heat of a heating medium.</p> |
