Environmental control system

Details Environmental control system Environmental control system

1993-10-26

1995-03-14

Tanner, Harry B.

Refrigeration

Automatic control

Refrigeration producer

62222, 622284, 62510, F25B 4104, F25B 110

Patent

active

053967798

ABSTRACT:
An environmental control system includes a refrigeration loop including a two-stage variable speed centrifugal compressor having a low pressure compressor in flow communication with a high pressure compressor and having an inlet and an outlet, a condenser having an inlet connected with the compressor outlet and an outlet, an evaporator having an inlet connected with the condenser outlet and an outlet connected with the compressor inlet and an expansion valve connected between the condenser outlet and the evaporator inlet, and a selectively operative bypass valve in flow communication with the low pressure compressor discharge and the compressor inlet for partially recirculating a portion of the low pressure compressor discharge back to the compressor inlet to regulate compressor flow balance.

REFERENCES:
patent: 3495418 (1970-02-01), Kapich
patent: 3668883 (1972-06-01), Ruff et al.
patent: 4495779 (1985-01-01), Tanaka et al.
patent: 4938029 (1990-07-01), Shaw

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