Co2-kühlsystem mit hochdruckventilsteuerung auf basis der leistungsziffer

Abstract

A refrigeration system (100) includes an evaporator (12, 22) within which a refrigerant absorbs heat, a gas cooler / condenser (2) within which the refrigerant rejects heat, a compressor (14, 24, 26) operable to circulate the refrigerant between the evaporator (12, 22) and the gas cooler / condenser (2), a high pressure valve (4) operable to control a pressure of the refrigerant at an outlet of the gas cooler / condenser (2), and a controller (50). The controller (50) is configured to automatically generate a setpoint for a measured or calculated variable of the refrigeration system (100) based on a measured temperature of the refrigerant at the outlet of the gas cooler / condenser (2). The setpoint is generated using a stored relationship between the measured temperature and a maximum estimated coefficient of performance (COP) that can be achieved at the measured temperature. The controller (50) is configured to operate the high pressure valve (4) to drive the measured or calculated variable toward the setpoint.