| 摘要 |
PROBLEM TO BE SOLVED: To provide a refrigeration and air conditioning device of high efficiency by stably and quickly adjusting the quantity of refrigerant in a radiator contributing on the efficiency of the device, in the refrigeration and air conditioning device using the refrigerant such as CO2 used in a supercritical zone. SOLUTION: A degree of superheat of an outlet of an evaporator 5 is controlled to a prescribed value by controlling an opening of an expansion valve 6 mounted at an upstream side of the evaporator 5 by a thermal operation, and the expansion valve 9 is controlled to keep the refrigerant in a connection pipe at a high-pressure side, in a supercritical state. In this condition, the density of refrigerant stored in a refrigerant storage container 12 is changed by controlling a flow rate control valve 13, and the quantity of refrigerant existing in the radiator 10 is adjusted. Further a target value of high pressure and a target value of radiator outlet temperature are determined, a capacity of a compressor 3 is controlled to achieve these target values, and the quantity of refrigerant existing in the radiator 10 is adjusted by a refrigerant quantity adjusting circuit 20. COPYRIGHT: (C)2006,JPO&NCIPI
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