REFRIGERATION DEVICE

摘要

To provide, in a refrigerating apparatus using a refrigerant that works including a process of a supercritical state, a refrigerating apparatus whose coefficient of performance can be improved while maintaining device reliability even when its load fluctuates. A heat source-side heat exchanger (4) is connected to a discharge side of a high stage-side compression element (2d), and connecting pipes (72, 73, 74, 75) interconnect the heat source-side heat exchanger (4) and an expansion mechanism (5). Connecting pipes (77, 2a) interconnect a utilization-side heat exchanger (6) and a suction side of a low stage-side compression element (2c). A liquid-gas heat exchanger (8) causes heat exchange to be performed between the refrigerant flowing through the connecting pipes (72, 73, 74, 75) and the refrigerant flowing through the connecting pipes (77, 2a). A liquid-gas three-way valve (8C) switches between a state where it allows the refrigerant to flow in portions of the connecting pipes (72, 73, 74, 75) passing through the liquid-gas heat exchanger (8) and a state where it allows the refrigerant to flow in a liquid-gas bypass pipe (8B) that interconnects one end side and the other end side of the portions passing through the liquid-gas heat exchanger (8).