Freezing apparatus
A refrigeration device and refrigerant technology, which is applied in the field of expansion valve control, can solve problems such as instability, superheat control cannot be performed well, and superheat control cannot be performed, so as to achieve the effect of improving control performance
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[0064] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
[0065] Such as figure 1 As shown, the air conditioner 10 of this embodiment includes a refrigerant circuit 20 and a controller 38 .
[0066] The refrigerant circuit 20 is filled with carbon dioxide (CO 2 ) closed loop. The refrigerant circuit 20 is configured to circulate a refrigerant to perform a vapor compression refrigeration cycle. In addition, the refrigerant circuit 20 is configured to perform a supercritical refrigeration cycle (that is, a refrigeration cycle including a vapor pressure region above the critical temperature of carbon dioxide) at a high pressure set to a value equal to or higher than the critical pressure of carbon dioxide.
[0067] The refrigerant circuit 20 is connected with a compressor 21, a four-way reversing valve 22, an outdoor heat exchanger 23, an outdoor expansion valve 24, a liquid receiver 25 (receiver 25), an indoor expansion val...
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