| 摘要 |
<P>PROBLEM TO BE SOLVED: To make a workload of a compressor appropriate, and to save energy. Ž<P>SOLUTION: This refrigeration device is provided with a refrigerant circuit (10) which includes a first branch pipe (34) having a liquid refrigerant of a liquid pipe (33) branched and made to flow and including a supercooling expansion valve (29) and a supercooling heat exchanger (28) provided in the liquid pipe (33) and performing the supercooling of a liquid refrigerant in the liquid pipe (33) by a branched refrigerant made to flow in from the first branch pipe (34) and in which the branched refrigerant after supercooling is injected to intermediate-pressure compression chambers of the compressors (21a, 21b, 21c). A controller (80) determines a target temperature of the liquid refrigerant of the liquid pipe (33) after supercooling in accordance with a cooling load in an interior heat exchanger (53), and performs the opening control of the supercooling expansion valve (29) so that a temperature of a liquid temperature sensor (68) reaches a target temperature. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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