| 摘要 |
PROBLEM TO BE SOLVED: To suppress the deterioration of a defrosting capacity caused by radiation to the outside from an intermediate cooler in a defrosting operation, in a refrigerating device having a refrigerant circuit constituted to switch a cooling operation and a heating operation, and performing a multistage compression type refrigerating cycle by using a refrigerant activated in a supercritical region. SOLUTION: An air conditioner 1 uses a carbon dioxide as the refrigerant, and comprises a two-stage compression type compressing mechanism 2, a heat source-side heat exchanger 4, an expanding mechanism 5, an utilization-side heat exchanger 6, a switching mechanism 3, an intermediate cooler 7 functioned as a cooler of the refrigerant discharged from a former stage-side compressing element and sucked to a latter stage-side compressing element, and an intermediate cooler bypass pipe 9. In the air conditioner 1, the refrigerant flows in the heat source-side heat exchanger 4 and the intermediate cooler 7 in the defrosting operation for defrosting the heat source-side heat exchanger 4, and the refrigerant is not allowed to flow to the intermediate cooler 7 by using the intermediate cooler bypass pipe 9 after the completion of the defrosting of the intermediate cooler 7 is detected. COPYRIGHT: (C)2009,JPO&INPIT
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