| 摘要 |
A heat pump apparatus includes a heat source-side refrigeration cycle sequentially connecting a compressor 1, a heat source-side heat exchanger, an expansion valve 4, and a heat source side of a cascade heat exchanger 5, and configured to circulate refrigerant, and a load-side refrigeration cycle sequentially connecting a heat medium sending unit, a load-side heat exchanger, and a load side of the cascade heat exchanger 5, and configured to circulate a heat medium. The heat source-side heat exchanger and the cascade heat exchanger 5 each have an equivalent diameter of less than 1 mm, which is calculated by 4 x S/L, where S represents a cross-sectional area of a fluid passage and L represents a length of a wetted perimeter. |
