| 摘要 |
PURPOSE:To enable to raise the temperature of a hot water storage tank even when the difference between the temperature of a heat collector and of the hot water storage tank is small and consequently the heat quantity to be carried is markedly small by a simple piping line structure wherein a heat pump with low running cost is applied as the auxiliary heat source of a natural circulation type solar heat collection device. CONSTITUTION:When a compressor is brought into operation under the state that the difference between the temperatures of a hot water storage tank and of a heat collector is too small for working fluid to circulate itself naturally, the heat collection state is established by heat pump operation. Concretely, the vapor of working fluid, which is turned to be high temperature and high pressure by means of the compressor 9, condenses at a condenser 7 into high pressure working fluid 6 and, after that, expands at an expansion valve 13. The resultant low temperature, low pressure working fluid 6 flows in a heat collector 1, resulting in easily evaporating itself. The vapor produced by the evaporation of the working fluid passes through a flow pipe 4 and is separated at the accumulator 8 in a piping 4a from the fluid and is compressed at a compressor 9 so as to be sent under pressure to the condenser 7. As a result, the heat obtained at the heat collector 1 is carried to the hot water storage tank 2, resulting in enabling to raise the temperature of the hot water storage tank 2 up to a certain value or above, regardless of the insolation intensity. |
