| 摘要 |
PURPOSE: To simplify the structure by a method wherein a refrigerant-water heat exchanger is provided, a refrigerant condensing circuit thereof is connected to a four- way valve of a heat pump and the discharge side of a compressor and a refrigerant evaporation circuit, to the inlet side of the compressor and an evaporation pipe separately in the apparatus of the title system for domestic use. CONSTITUTION: A water-refrigerant heat exchanger 30 is arranged between a heat pump 10 and a water heater 32 for domestic use and a water circuit 40 is linked to a hot water storage tank 35 through a water pipe 45 and a circulation pump 49. A refrigerant condensing circuit 41 is linked into a discharge pipe 13 between a compressor 12 and a four-way reversible valve 15. A refrigerant evaporating circuit 42 is linked in series between the suction side of the compressor 12 and an evaporation pipe (expansion pipe) 52 through a secondary suction pipe 51, and the other end of the evaporation pipe 52 is linked to a liquid phase refrigerant pipe 20 through an outdoor heat exchanger 18 and a bi-flow expansion valve 21. With such an arrangement, all sectors through which the refrigerant flows are always connected to an inlet of the compressor regardless of the operation mode to get rid of unnecessary valves and pipe circuits thereby simplifying the structure. |
