| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat pump cycle of a high pressure specification capable of unnecessitating a four-way valve and avoiding the use of a heat exchanger arranged within a unit for both of high and low pressure. SOLUTION: This cycle is provided with a compressor 4 capable of setting discharge pressure to above critical pressure of a refrigerant, a first heat exchanger 1 arranged within the unit and having a heat radiating function allowing internal pressure to be above critical pressure of the refrigerant, a second heat exchanger 2 having a heat absorbing function arranged within the unit, a third heat exchanger 3 arranged on the outside of the unit and alternatively selecting the heat radiating function and the heat absorbing function and an accumulator 5. When performing a cooling operation, a cooling circuit is constituted to change the refrigerant in its state in the order of the compressor 4, the first heat exchanger 1, the third heat exchanger 3, the second heat exchanger 2, the accumulator 5 and the compressor 4. When performing a heating operation, a heating circuit is constituted to change the refrigerant in its state in the order of the compressor 4, the first heat exchanger 1, the third heat exchanger 3, the second heat exchanger 2, the accumulator 5 and the compressor 4.
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