| 摘要 |
[PROBLEMS] To improve the initial pulling-down performance of a refrigerating machine employing a non-azeotropic refrigerant immediately after starting when the chamber temperature is high. [MEANS FOR SOLVING PROBLEMS] A single-stage refrigerating machine which employs a non-azeotropic refrigerant and has a compressor (1), a condenser (2), and an evaporator (10), and in which heat exchange (3) is conducted between the refrigerant returned from the evaporator and the high-pressure refrigerant flowing from the condenser toward the evaporator is controlled in the following manner. When a high load is imposed as just after starting, capillary tubes (6-1) to (6-5) serving as expansion valves for the evaporator are made fully open with electromagnetic valves (5-1) to (5-5). As the internal temperature of the chamber declines, the tubes are successively closed. Thus, the pressure and flow amount of the refrigerant gas are regulated. When the internal temperature of the chamber is high and the condensation of a low-boiling ingredient does not proceed, the refrigerating ability of a high-boiling refrigerant can be exhibited in the highest degree.
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