BigPatents India

A refrigerating device, comprising a refrigerating circuit having a compressor (1), an indoor heat exchanger (3), a main motor-driven valve (EV1), and an indoor heat exchanger (5) connected annularly to each other, wherein an R32 refrigerant or a mixed refrigerant containing R32 by at least 70% by weight is used as working media, an overcooling heat exchanger (11) is disposed between the indoor heat exchanger (3) and main motor-driven valve (EV1), the gas side of the refrigerant circuit is bypassed, using bypass tubes (33, 34) to the liquid side thereof through the overcooling heat exchanger (11), an overcooling motor-driven valve (EV2) is disposed in the bypass tube (33) on the upstream side of the overcooling heat exchanger (11), a delivery temperature detected by a delivery temperature sensor (21) is judged by a delivery temperature judgment part (10b) and, based on the judgment results thereof, the opening of the overcooling motor-driven valve (EV2) is controlled so as to control the volume of refrigerant flowing through the bypass tubes (33, 34), whereby, using the working media containing R32 refrigerant, the delivery temperature of the compressor can be optimized without lowering an efficiency so as to increase the COP and reliability. Drawing : 11 Sheets Total Pages: 58 (FIG. - 1)