HEAT TRANSFER DEVICE

摘要

A heat transfer device that can, when CO₂ is used as refrigerant and without additions of a heater and a cooler, regulate a difference between the amount of refrigerant in heating operation and that in cooling operation. The heat transfer device (20) has third flow paths (L31, L32) arranged parallel to a second flow path (L2), a refrigerant tank (3) provided in the third flow paths (L31, L32), and a fourth flow path (L4) having one end communicated with a first flow path (L1) and the other end with the refrigerant tank (3). In the heat transfer device (20) in cooling operation, refrigerant discharged from a liquid pump (1) is returned to the liquid pump (1) after sequentially passing through a utilization-side heat exchanger (4), the refrigerant tank (3), and a heat source-side heat exchanger (2) and a portion of liquid refrigerant discharged from the liquid pump (1) is contained in the refrigerant tank (3) through the fourth flow path (L4). In heating operation, refrigerant discharged from the liquid pump (1) is returned to the liquid pump (1) after sequentially passing through the heat source-side heat exchanger (2) and the utilization-side heat exchanger (4).