| 摘要 |
Disclosed herein is a hot water supply apparatus for combined use of an air conditioner. The hot water supply apparatus includes an outdoor unit 2 having a compressor 11 in which first refrigerant is compressed and an outdoor heat exchanger 12 in which the first refrigerant is heat-exchanged with outdoor air; a plurality of indoor units connected to the outdoor unit 2 and having an indoor heat exchanger 23 in which the first refrigerant is heat-exchanged with indoor air; and a cascade hot water heater 8 connected to the plurality of indoor units 4 and 6 in which the first refrigerant is heat-exchanged with second refrigerant, wherein the cascade hot water heater 8 includes a capacity variable compressor 32 which compresses the second refrigerant, a water refrigerant heat exchanger 38 in which the second refrigerant compressed by the capacity variable compressor 32 is condensed by heating water, an expander 36 in which the second refrigerant condensed in the water refrigerant heat exchanger 34 is expanded, and a cascade heat exchanger 34 in which the second refrigerant expanded in the expander 36 is heat-exchanged with the first refrigerant and then evaporated, and the cascade hot water heater 8 modifies a flowing amount of the second refrigerant according to an outdoor temperature, an outlet water temperature of the water refrigerant heat exchanger 38 and a working rate of the plurality of indoor units 4 and 6 and the cascade hot water heater 8. Refrigerant balance between the plurality of indoor units and the cascade hot water heater can be ensured and phenomenon in which the lack of the first refrigerant flowing to the plurality of indoor units 4 and 6 is minimized. |
