Patent ID: 11885537
Assignee: COPELAND EUROPE GMBH
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 12:
13. A method of controlling injection into a compressor in a refrigeration cycle, wherein the method is performed in a refrigeration cycle, which comprises at least an economizer heat exchanger, a heat rejection heat exchanger, a first expansion device, and a compressor configured for compressing the refrigerant, wherein the compressor comprises a means for compressing, a suction port, a discharge port, and an injection port, wherein the discharge port is connected to the heat rejection heat exchanger via a discharge line and wherein the injection port is connected to the means for compressing, and wherein the economizer heat exchanger comprises:
a first path, which has an input, which is connected to the heat rejection heat exchanger, and an output, which is connected to the first expansion device, and
a second path, which has an input, which is connected to the heat rejection heat exchanger via an economizer valve, and an output, which is connected to the injection port of the compressor via an injection line;
the method comprising:
determining a pressure of the refrigerant in the injection line;
determining a temperature of the refrigerant in the discharge line; and
based on the determined pressure and the determined temperature, selecting one of:
a first operation mode for regulating the economizer valve based on a superheat level of the refrigerant at the output of the second path of the economizer heat exchanger,
a second operation mode for regulating the economizer valve based on the temperature of the refrigerant in the discharge line, and
a third operation mode for regulating the economizer valve based on the pressure of the refrigerant in the injection line;
regulating the economizer valve by using the selected operation mode.