Refrigeration – Automatic control – Diverse – cascade or compound refrigeration-producing system
Patent
1986-02-28
1987-07-14
Wayner, William E.
Refrigeration
Automatic control
Diverse, cascade or compound refrigeration-producing system
622285, 236 78D, F25B 700
Patent
active
046794042
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.
REFERENCES:
patent: 3513662 (1970-05-01), Golber
patent: 3717300 (1973-02-01), Evalds
patent: 4132086 (1979-01-01), Kountz
patent: 4152902 (1979-05-01), Lash
patent: 4184341 (1980-01-01), Friedman
patent: 4384462 (1983-05-01), Overman et al.
patent: 4439997 (1984-04-01), Cantley
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