| 摘要 |
A heat pump type water heating apparatus is disclosed. The water heating apparatus includes a refrigeration cycle circuit (2) including a compressor (12), a dual heat exchanger (14), an expansion device (16), and an outdoor heat exchanger (18), via which a first refrigerant is circulated, the dual heat exchanger (14) including a first refrigerant and water heat exchanger (40) and a first refrigerant and second refrigerant heat exchanger (50), a cascade compressor (82) to compress the second refrigerant having passed through the first refrigerant and second refrigerant heat exchanger (50), a second refrigerant and water heat exchanger (84) to perform heat exchange between the second refrigerant compressed by the cascade compressor (82) and water, a cascade expansion device (86) to expand the second refrigerant having passed through the second refrigerant and water heat exchanger (84), and a water heating channel (8) connected to the first refrigerant and water heat exchanger (40) and the second refrigerant and water heat exchanger (84). |
