COOLING SYSTEM

Abstract

[Problem] In a cooling system that cools a battery or the like in a vehicle by circulating a refrigerant preferably containing CO2, to prevent the refrigerant from reaching a high temperature due to pressure increase by the compressor.[Means of solution] A cooling system 100 comprises a compressor 1, which compresses a refrigerant in two stages using a first and a second compressor 1a, 1b, a heat exchanger 2, which cools the refrigerant from the compressor 1, heat exchangers 5a, 6a, which use the refrigerant from the heat exchanger 2, a refrigerant channel 17, which supplies the refrigerant from the heat exchanger 2 to a battery 6 and to the first compressor 1a, refrigerant channels 18, 19, which supply the refrigerant from the heat exchangers 5a, 6a to the second compressor 1b, an expansion valve E2, which is provided on the refrigerant channel 17, and an expansion valve E3, which is provided on the refrigerant channel 18, and a control device 80, which performs a control to increase the opening degree of the expansion valve E3 when the temperature of the refrigerant discharged from the second compressor 1b The refrigerant is equal to or higher than a predetermined temperature.