Method of compressor staging for multi-compressor multi-circuite

Details Method of compressor staging for multi-compressor multi-circuite Method of compressor staging for multi-compressor multi-circuite

1993-01-26

1993-08-03

Wayner, William E.

Refrigeration

Automatic control

Diverse, cascade or compound refrigeration-producing system

62510, 417 8, F25B 700

Patent

active

052318460

ABSTRACT:
A method of staging and modulating compressors in a multi-circuited refrigeration system including a plurality of condensing heat exchange circuits where each condensing heat exchange circuit includes a plurality of compressors. The method comprises the steps of: accumulating a first operative condition for each compressor; accumulating a second operative condition for each compressor; determining the status of each compressor in each circuit and designating therefrom a first list of circuits having compressors available to be turned on and a second list of circuits having compressors available to be turned off. The method also comprises the steps of: initiating operation of the compressor from the first list with the lowest accumulation of the first operative condition whenever the system calls for an increase in capacity; terminating operation of the compressor from the second list having the greatest accumulation of the second operative condition whenever the system calls for a decrease in capacity; determining the number of compressors which should be modulating; and modulating, subject to the modulating compressor number determining step, the compressors necessary to meet the modulating compressor number in accordance with the greatest accumulation of the second operative condition.

REFERENCES:
patent: 4152902 (1979-05-01), Lush
patent: 4341983 (1982-07-01), Gottliebson
patent: 5123526 (1992-06-01), Oltman

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