A refrigeration system (10, 40) for operating a refrigeration circuit having a refrigerant, comprising: - a collection container for collecting refrigerant; - at least one evaporator which is configured such that it evaporates a liquid portion of the refrigerant located in the collection container that is supplied to said evaporator; - at least a first compressor which is configured such that it sucks in and compresses a gaseous portion of the refrigerant located in the collection container; - a condenser or gas cooler connected downstream of the at least a first compressor; - at least one ejector which is connected downstream of the condenser or gas cooler and which has a respective suction connector which is connected to an outlet of the at least one evaporator, wherein the at least one ejector is configured such that it supplies the refrigerant received from the condenser or gas cooler and the refrigerant sucked in by the at least one evaporator via the suction connector to the collection container; and - a regulation device for regulating the operation of the refrigeration circuit, wherein - the regulation device is configured such that it regulates the operation of the refrigeration circuit on the basis of a predefined relationship between the state of the refrigerant in the collection container and the state of the refrigerant downstream of the at least one evaporator, characterized in that the predefined relationship is a predefined pressure ratio between the pressure of the refrigerant in the collection container and the pressure of the refrigerant downstream of the at least one evaporator or a predefined temperature ratio between the temperature of the refrigerant in the collection container and the temperature of the refrigerant downstream of the at least one evaporator. - a collection container for collecting refrigerant; - at least one evaporator which is configured such that it evaporates a liquid portion of the refrigerant located in the collection container that is supplied to said evaporator; - at least a first compressor which is configured such that it sucks in and compresses a gaseous portion of the refrigerant located in the collection container; - a condenser or gas cooler connected downstream of the at least a first compressor; - at least one ejector which is connected downstream of the condenser or gas cooler and which has a respective suction connector which is connected to an outlet of the at least one evaporator, wherein the at least one ejector is configured such that it supplies the refrigerant received from the condenser or gas cooler and the refrigerant sucked in by the at least one evaporator via the suction connector to the collection container; and - a regulation device for regulating the operation of the refrigeration circuit, wherein - the regulation device is configured such that it regulates the operation of the refrigeration circuit on the basis of a predefined relationship between the state of the refrigerant in the collection container and the state of the refrigerant downstream of the at least one evaporator, characterized in that the predefined relationship is a predefined pressure ratio between the pressure of the refrigerant in the collection container and the pressure of the refrigerant downstream of the at least one evaporator or a predefined temperature ratio between the temperature of the refrigerant in the collection container and the temperature of the refrigerant downstream of the at least one evaporator.