Patent ID: 8316654

Claim:
Refrigerating system comprising a refrigerating circuit having, in flowing direction, a compressor, a gas cooler, a first expansion device, an intermediate pressure container, a second expansion device, an evaporator and refrigerant conduits circulating a refrigerant therethrough; wherein the first expansion device expands the refrigerant to an intermediate pressure level; wherein a first refrigerant conduit of the refrigerant conduits connects the compressor and the gas cooler, and a second refrigerant conduit of the refrigerant conduits connects the gas cooler and the first expansion device, the first refrigerant conduit, the gas cooler, and the second refrigerant conduit forming a transcritical portion of the refrigerating circuit; wherein the compressor is operable such that the refrigerant is in a transcritical state in the transcritical portion; wherein the refrigerating system further comprises a desuperheating unit, the desuperheating unit being in a heat exchange relationship with at least a part of the second refrigerant conduit, thereby in operation desuperheating the refrigerant being circulated in the refrigerating circuit; wherein a plurality of fan stages is provided with the gas cooler; wherein the performance of the refrigerating system is in part controlled by operating an appropriate number of fan stages and by operating the desuperheating unit, thereby achieving a desired level of desuperheating of the refrigerant in the refrigerating circuit.