COOLANT CIRCUIT

The invention concerns a two-stage refrigerant fluid circuit, comprising a first heat exchanger (1) forming a condenser, a second heat exchanger (2) forming an evaporator, a first compressor (C1), a second compressor (C2), a first expansion device (D1), a second expansion device (D2), a bottle (B) capable of separating the liquid phase and the gas phase of the refrigerant fluid, characterized in that it comprises a third heat exchanger (3) forming an evaporator.