| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem on degradation of operation efficiency when a load medium of high temperature is heated, as a refrigerant state at an outlet of a radiator is gas, and a gas-liquid two phase refrigerant can not be prepared even when the refrigerant is decompressed, a function of a heat pump can not be exerted. <P>SOLUTION: In an expanding section 13a, a part of the refrigerant at the outlet of the radiator 2 flows therein, is expanded and decompressed to generate power, and flows out from the expanding section 13a. In a compressing section 13b, a saturated gas refrigerant coming out from an accumulator 7 flows therein, is compressed for pressure rising, and flows out from the compressing section 13b. The refrigerants flowing out from the expanding section 13a and the compressing section 13b are joined, and flow into a low pressure side of a high/low pressure heat exchanger 4. Thus a pressure of the refrigerant decompressed to a pressure Pe lower than a saturated pressure to an outside air temperature in a bypass circuit 8 can be raised to the saturated pressure or more to the outside air temperature by an expanding machine 13. The compression power of the compressor 1 can be reduced in comparison with a case when the pressure of the refrigerant of the bypass circuit 8 is raised by the compressor 1 from the state of pressure Pe, and the operation of high efficiency can be performed. <P>COPYRIGHT: (C)2011,JPO&INPIT |
