| 摘要 |
PROBLEM TO BE SOLVED: To prevent a liquid from returning, improve the reliability of a compressor, and at the same time prevent the formation of dew in piping at the inlet side of a refrigerant by detecting a dew-point temperature at a location where a refrigerator is installed and the temperature of a refrigerant at the suction side of a compressor, and controlling a flow rate control valve for controlling the flow rate of the refrigerant based on both the detection temperatures. SOLUTION: A suction temperature sensor 7 for detecting a suction side refrigerant temperature T7 of a compressor 1 in a refrigerator is provided, and at the same time an indoor temperature sensor 10 for detecting an indoor temperature T10 that is the surrounding temperature of a location where the refrigerator is installed is provided. Then, in a control circuit 8 for inputting the output signal of the temperature sensors 7 and 10, a dew-point temperature TR1 at a predetermined moisture is calculated based on the indoor temperature T10 and at the same time it is judged which of a dew-point temperature TR (= dew-point temperature TR1) to be compared and a suction temperature T7 is higher. In the case of T7>TR=TR1, an electric flow rate control valve 12 is driven in an opening direction. On the other hand, in the case of T7<TR=TR1, the electric flow rate control valve 12 is controlled in a closing direction.
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