| 摘要 |
It is an object of this invention to provide an air conditioning apparatus using supercritical refrigerant for easily regulating the circulation amount of refrigerant. A refrigeration apparatus (1b) uses refrigerant operating in the supercritical zone. The refrigeration apparatus (1b) includes a compressor (21), a first heat exchanger (23), a first expansion mechanism (V2), a subcooling heat exchanger (24), a second expansion mechanism (V3), a second heat exchanger (31) and a control section (5). The compressor is configured to compress the refrigerant. The first heat exchanger is configured to cool the high-pressure refrigerant compressed by the compressor. The first expansion mechanism is configured to decompress the refrigerant to critical pressure or less. The subcooling heat exchanger is configured to subcool the refrigerant decompressed by the first expansion mechanism. The second expansion mechanism is configured to decompress the refrigerant cooled by the subcooling heat exchanger to low pressure. The second heat exchanger is configured to heat the refrigerant decompressed by the second expansion mechanism. The control section is configured to conduct first control to regulate the first and second expansion mechanisms for storing the refrigerant of a liquid state in the subcooling heat exchanger.
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