Method for operating a compression refrigeration system

Abstract

Method for controlling a compression refrigeration system (200), in particular a heat pump (100), in which: - a gaseous refrigerant is compressed from a low pressure (LP) to a high pressure (HP) by a compressor (210) controlled by a controller (500); - the refrigerant is forced through a condenser (220) in which it releases heat (Qh) to a heating medium located in a heat sink system (400); - internal heat (Qi) of the refrigerant is exchanged in a recuperator (250) between the refrigerant flowing under high pressure (HP) from the condenser (220) to the expansion valve (230) and the refrigerant flowing under low pressure (LP) from the evaporator (240) to the compressor (210); - the refrigerant is guided in a high-pressure flow direction (HPP) to an expansion valve (230) controlled by the controller (500), in which the The refrigerant is released from high pressure (HP) to low pressure (LP) depending on a control value (R).wherein - the refrigerant located at low pressure ND in the evaporator (240) evaporates upon absorbing source heat QQ, comprising the process steps: - determining a target value (ZÜA) for the evaporator outlet superheat (TÜA) and a target value (ZÜE) for the compressor inlet superheat (TÜE), - calculating a correction value based on a control deviation of the compressor inlet superheat (TÜE) from the target value (ZÜE) for the compressor inlet superheat (TÜE), - correcting the target value (ZÜA) for the evaporator outlet superheat (TÜA) with the calculated correction value, - calculating a control value (R) after a commissioning phase of the compression refrigeration system (200) depending on the target value (ZÜA) for the evaporator outlet superheat (TÜA) and the target value (ZÜE) for the compressor inlet superheat (TÜE), and- control of the expansion valve (230) based on the control value (R).,

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