| 摘要 |
PROBLEM TO BE SOLVED: To achieve capacity control utilizing the characteristics of a heat- transferring device by adjusting the amount of the collection of a refrigerant or the amount of the supply of the refrigerant of a drive force generation circuit. SOLUTION: A flow-rate adjustment valve 11 is provided at a liquid collection pipe 12 for connecting a utilization-side circuit 7 to the liquid inlet/outlet of both tanks 141 and 142. In a first connection state, the first tank 141 becomes a pressurization tank and the second tank 142 becomes a reduced-pressure tank, a liquid refrigerant being supplied from the first tank 141 is circulated through the utilization-side circuit 7 and is collected by the second tank 142. When the first connection state is allowed to continue, the liquid refrigerant of the first tank 141 tends to be in shortage and that of the second tank 142 tends to be excessive. Then, the connection state is switched to the second connection state. Therefore, the second tank 142 is connected to a pressurization heat exchanger 131, and at the same time the first tank 141 is connected to a reduced pressure heat exchanger 132, thus pressurizing the second tank 142 and at the same time enabling the first tank to become a reduced pressure tank and hence reducing pressure from an upper part.
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