| 摘要 |
PURPOSE:To form a simple system by a method wherein heat pipe mode operation and heat pump mode operation are switched in the same system without employing a solenoid valve or three-way switching valve. CONSTITUTION:A non-return valve is provided between the upper port of an evaporating section and a condensing section in parallel to the circuit of a compressor. In case the amount of sunshine is sufficient, solar heat is absorbed by heat collecting fins to evaporate refrigerant in the evaporating section 12. The gas of refrigerant arrives at the condensing section 14 of a heat exchanging tank 13 through a non-return valve 20 and is liquefied by cooling of a heat medium 28. The liquefied refrigerant flows down through the condensing section 14, passes through a differential pressure driving non-return valve 24 and returns to the lower port 21 of the evaporating section 12. In case the amount of sunshine is insufficient, the valve 26 of differential pressure driving non-return valve 24, in parallel to an expanding device, is closed by the refrigerant gas pressurized by the compressor 18, the inside of a pipeline to the expanding device 23 is kept in a high pressure by the non-return valve 20, the refrigerant gas is liquefied in the condensing section 14, the gas arrives at the evaporating section 12 after the pressure thereof is reduced by the expanding device 23 and is returned to the compressor 18 again under being evaporated by depriving solar heat and atmospheric heat. Accordingly, the system without the solenoid valve or the switching valve, may be operated by the differential pressure driving non-return valve 24. |
