| 摘要 |
PROBLEM TO BE SOLVED: To provide a refrigeration device capable of preventing the solidification of refrigerant having a low global warming coefficient, and allowing the refrigerant to function at a lower temperature.SOLUTION: Refrigeration devices 1 and 101 share a gas-liquid separator 11 therebetween, and each include a lower-stage refrigerant circuit 3 and a higher-stage refrigerant circuit 5 each filled with mixture refrigerant in which two or more types of refrigerant having different boiling points are mixed together. The lower-stage refrigerant circuit is provided with an intermediate cooler 9 flowing out gas-liquid two-phase refrigerant to the gas-liquid separator. Each refrigeration device further includes a heat-exchange-amount control unit 23 that controls a heat exchange amount in the intermediate cooler. The heat-exchange-amount control unit 23 reduces the heat exchange amount in the intermediate cooler, and relatively increases a rate of the high boiling point refrigerant in a circulation composition of the lower-stage refrigerant. |
