Variable superheat target strategy for controlling an electrical

Details Variable superheat target strategy for controlling an electrical Variable superheat target strategy for controlling an electrical

1992-04-10

1993-02-23

Tanner, Harry B.

Refrigeration

Automatic control

Refrigeration producer

62212, F25B 4100

Patent

active

051879441

ABSTRACT:
A method of controlling a refrigeration system employing an electronic controller for operating an electrically actuated refrigerant expansion valve supplying the evaporator or endothermic heat exchanger. The controller is of the type which modulates the valve for refrigerant flow to maintain a desired target level of superheated vapor discharging from the evaporator. When the compressor return, or evaporator discharge pressure (P.sub.c) is within a preselected range the system employs a strategy to increment or decrement the target level of superheat depending upon whether the rate of change (.DELTA.P.sub.c) of discharge pressure is positive or negative and thereby maximize pulldown by minimizing compressor cycling to achieve the superheat target.

REFERENCES:
patent: 4523435 (1985-06-01), Lord
patent: 4617804 (1986-10-01), Fukushima
patent: 4646532 (1987-03-01), Nose
patent: 4845956 (1989-07-01), Berntsen et al.

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