Refrigeration system

A refrigeration system, comprising:

• a refrigerant circuit, which uses a refrigerant and in which there is guided a total mass flow of the refrigerant;
• a high-pressure-side heat exchanger arranged in the refrigerant circuit and cooling refrigerant compressed to a high pressure;
• an expansion member, which is arranged in the refrigerant circuit following on from the high-pressure-side heat exchanger and in the active state cools the total mass flow of the refrigerant by expansion and in so doing generates a principal mass flow of liquid refrigerant and an auxiliary mass flow of gaseous refrigerant, which enter an intermediate-pressure collector and are separated therein into the principal mass flow and the auxiliary mass flow;
• at least one cooling stage which expands the principal mass flow from the intermediate-pressure collector to a low pressure in at least one cooling expansion member and in so doing makes refrigerating capacity available at a low-pressure-side heat exchanger;
• a refrigerant compressor unit which compresses the principal mass flow from a low pressure to a high pressure, the refrigerant compressor unit comprising a plurality of cylinder units and a plurality of cylinder drives;
• wherein the refrigerant compressor unit has a first compressor stage for compressing, to a medium pressure, the refrigerant of the principal mass flow supplied at low pressure, and a second compressor stage for compressing, to a high pressure, the refrigerant of the principal mass flow that has been compressed to a medium pressure, and the auxiliary mass flow from the intermediate-pressure collector enters the second compressor stage of the refrigerant compressor unit for compressing to a high pressure, with the high pressure being higher than the medium pressure, and the medium pressure being higher than the low pressure;
• wherein a drive chamber of the refrigerant compressor unit, from which the compressor stages are driven, is held at medium pressure, wherein the drive chamber of the refrigerant compressor unit receives the cylinder drives and borders on the cylinder units;
• and
• further comprising at least one inlet chamber supplying medium pressure to at least one cylinder unit for the second compressor stage, the at least one cylinder unit for the second compressor stage positioned radially between the at least one inlet chamber and the drive chamber.