| 摘要 |
PROBLEM TO BE SOLVED: To improve the performance and efficiency of an air conditioner composed of a waste heat utilizing circuit utilizing the waste heat of a heat source by a heat exchanger for heating to heat a conditioned room, a refrigerant circuit using a carbon dioxide as a refrigerant and having supercritical pressure at a high-pressure side, and a cascade heat exchanger exchanging heat between the fluid flowing from the heat source to the heat exchanger for heating in the waste heat utilizing circuit, and a refrigerant of the refrigerant circuit. SOLUTION: A refrigerant discharged from a compressor 11 is allowed to flow to the cascade heat exchanger 12, and the refrigerant coming out of the cascade heat exchanger 12 is divided by a flow divider, so that one of the refrigerants flows from an auxiliary expansion valve 15 for heating as an auxiliary pressure reducing device to an auxiliary heat exchanger 17 for heating as an internal heat exchanger to exchange heat with the refrigerant coming out of the cascade heat exchanger 12, and then sucked into a sealed container 30 as an intermediate pressure portion of the compressor 11, and the divided other refrigerant is allowed to flow from the expansion valve 20 for heating as a main pressure reducing device to an outdoor heat exchanger 23 (heat sink), and then sucked to a first compressing element 32 as a low pressure portion of the compressor 11. COPYRIGHT: (C)2007,JPO&INPIT
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