Method and apparatus for controlling a refrigerant expansion val

Details Method and apparatus for controlling a refrigerant expansion val Method and apparatus for controlling a refrigerant expansion val

1983-12-19

1985-06-18

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

62225, 236 78D, 364163, F25B 4100, G05D 1500

Patent

active

045234353

ABSTRACT:
A refrigeration system is disclosed which may have multiple compression and condenser stages, in which an electronic refrigerant expansion valve is controlled by the digital output of a microcomputer which adjust the expansion valve in response to a valve change signal which is a function of a fraction of the deviation of the sensed refrigerant superheat from a desired superheat added to a multiple of the computed rate of change of the refrigerant superheat.

REFERENCES:
patent: 3577743 (1971-05-01), Long
patent: 4407013 (1983-09-01), Arcara
patent: 4448038 (1984-05-01), Barbier
Microcomputer Control in Industrial Processes, Skrokov, 1980, p. 82.
Process Instruments & Controls Handbook; Considine, 1958, pp. 11-25.

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