| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for calculating the quantity of refrigerant accurately in a vapor compression type refrigeration cycle employing carbon dioxide as refrigerant. SOLUTION: A compressor 2, a radiator 3, an expansion means 5, and an evaporator 6 are coupled through piping to constitute a closed loop, temperature sensors 8, 9 and a pressure sensor 10 are provided at specified positions and carbon dioxide is employed as refrigerant circulating through the loop. In such a refrigeration cycle, pressure of the refrigerant is measured by means of the pressure sensor 10, if the temperature detected by the temperature sensors 8, 9, when the compressor 2 is not operating, is higher than the critical temperature of the refrigerant and the quantity of refrigerant is calculated based on the detected temperatures, pressure of the refrigerant, and the volume in the cycle where the refrigerant flows.
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