Refrigeration – Processes – Compressing – condensing and evaporating
Patent
1987-06-15
1989-05-02
Wayner, William E.
Refrigeration
Processes
Compressing, condensing and evaporating
62175, 417 7, F25B 500
Patent
active
048256625
ABSTRACT:
A control system for controlling a closed-loop refrigeration system having multiple parallel commonly piped compressors is disclosed. Various combinations of compressors define the compressor capacity stages of the system. The disclosed control system responds to a system parameter, such as the suction line pressure or the temperature of an area to be cooled by an evaporator of the refrigeration system, to control the selection of the minimum system compressor capacity necessary to maintain the temperature of the area to be cooled to the lowest temperature. Control of the compressor capacity is effected by the sensed system parameter by generating an operating range defined from an upper to a lower operating limit. Operations above or below this range determines whether an increase or decrease, respectively, in compressor capacity needs to be made. Additional control circuits are included to sense the difference between the sensed parameter and a desired setting to effect a shifting in the control operating range to obtain the minimum values for the operating limits which will accomplish the desired control function.
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