Patent ID: 6079220
Filing Date: 2000-06-27
Classification: F25B

Abstract:
A method of controlling a refrigerating machine having a compressor supplying refrigerant to a condenser, an evaporator connected with the condenser, a throttle valve between the condenser and the evaporator, a suction line connecting the evaporator with the compressor and a flowmeter, preferably a thermal anemometer being positioned in the suction line, said method comprising the steps of:a) applying the measuring signal of the flowmeter to determine fluctuations in a flow of a refrigerant fluid in said suction line;b) calculating a fluctuation measure from the measured fluctuations;c) comparing the fluctuation measure with a setpoint; andd) with a fluctuation measure below said setpoint indicating an underfilling of said evaporator, opening said valve to increase refrigerant supplies to said evaporator and upon a fluctuation measure exceeding said setpoint indicating an overfilling of said evaporator reducing the flow of refrigerant from said valve to said evaporator.