| 摘要 |
PURPOSE:To provide cooling and heating system, in which cooling and heating are effected by the natural circulation of refrigerant, by a method wherein a cold heat source is provided on the upper part of a building and a hot heat source is provided individually and respectively at the lower part of the building while the cold heat source at the upper part of the building is employed in cooling and the lower hot heat source is employed in heating. CONSTITUTION:A condenser heat exchanger in a cold heat source 1, in which refrigerant, whose phase is changed, is cooled and liquefied, is arranged at a part higher than a fan coil unit 2 and a closed circuit, connected through a refrigerant solution pipe 3 and a refrigerant gas pipe 4, is constituted and refrigerant is evaporated in a heat exchanger 22 in the fan coil unit 2 in respective rooms to cool the room upon cooling while a hot heat source 5 is provided at the lowermost part and the lower ends of refrigerant pipes 3, 4 are connected to the heat exchanger in the hot heat source 5 while the refrigerant is evaporated by heating a heat exchanger 51 upon heating and the refrigerant is condensed and liquefied in the fan coil unit 2 to radiate heat and effect room heating. A control device 6, closing valves 5a, 5b upon cooling and closing valves 1a, 1b upon heating to intercept the circuit, a refrigerant pressure or temperature sensor 7 and a liquid level sensor 8 are provided in this system. |
