HEAT PUMP TYPE COOLING/HEATING APPARATUS

摘要

PURPOSE: A hot-water supply device of a heat pump type is provided to enhance the temperature of discharged water by the cascade heat exchanger of a low-temperature freezing cycle and a high-temperature freezing cycle and to raise heating performance by injecting vapor refrigerant to the compressor of a low-temperature cycle area or the compressor of a high-temperature cycle area. CONSTITUTION: A hot-water supply device of a heat pump type comprises a cascade cycle unit, a refrigerant injecting path(26), and a gas-refrigerant control valve(30). The cascade cycle unit comprises a cascade heat exchanger(10) and a water-refrigerant heat exchanger(20). The cascade heat exchanger heat-exchanges the first refrigerant of a low-temperature freezing cycle(A) and the second refrigerant of the high-temperature freezing cycle(B). The water-refrigerant heat exchanger condenses the second refrigerant of the high-temperature freezing cycle to heat water. The refrigerant injecting path is branched from between the cascade heat exchanger and the evaporator of the low-temperature freezing cycle to inject refrigerant to the low-pressure compressor of the low-temperature freezing cycle.