Patent ID: 8590327

Claim:
A refrigerating apparatus for keeping a temperature inside a storage at a predetermined low-temperature state, the refrigerating apparatus comprising: a first refrigerant circuit including a first compressor, a first condenser, a first decompressor, and a first evaporator, connected circularly with a first piping to form a refrigerating cycle, the first refrigerant circuit having a first refrigerant sealed therein as a working refrigerant; a second refrigerant circuit including a second compressor, a second condenser, a second decompressor, and a second evaporator, connected circularly with a second piping to form a refrigerating cycle, the second refrigerant circuit having a second refrigerant sealed therein as a working refrigerant, a cascade condenser being constituted by integrating the first evaporator and the second condenser in a heat-exchangeable manner; a first sensor configured to detect a temperature of the first refrigerant in a vicinity of an outlet of the first evaporator; a second sensor configured to detect a temperature inside the storage; and a single controller configured to control an operation performance of the first compressor in a variable manner based on the temperature detected by the first sensor in order that the temperature detected by the first sensor is a first temperature, and to control an operation performance of the second compressor in a variable manner based on the temperature detected by the second sensor in order that the temperature detected by the second sensor is a second temperature, wherein the single controller is configured to start up the first compressor before the second compressor, and to start up the second compressor when the temperature detected by the first sensor decreases below a predetermined temperature.