Control for commercial refrigeration system

Details Control for commercial refrigeration system Control for commercial refrigeration system

1995-04-25

1996-12-24

Wayner, William E.

Refrigeration

Processes

Compressing, condensing and evaporating

62175, 318610, 364163, 417 5, F25B 700, F04B 4106

Patent

active

055864449

ABSTRACT:
A compressor control system for a commercial refrigeration system includes a variable speed compressor and multiple fixed speed compressors. The control system calculates a variable which fluctuates according to the desired capacity of the system and is calculated as a function of the difference between a variable indicative of the refrigeration load on the system, such as compressor suction pressure, and a target value. A "PID" proportional-integral-differential (PID) controller is used in which terms have been added which fluctuate as a function of the square of the difference between the sensed variable and the target value and as a function of the second derivative of the control variable with respect to time. Fixed speed compressors are turned on or off and the speed of the variable speed compressor is adjusted to bring the actual refrigeration capacity of the system in line with the system refrigeration requirements.

REFERENCES:
patent: 3163813 (1964-12-01), Oldenburger
patent: 3775653 (1973-11-01), Peterson et al.
patent: 4633672 (1987-01-01), Persem et al.
patent: 4951475 (1990-08-01), Alsenz

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