Refrigeration – Automatic control – Refrigeration producer
Patent
1993-01-25
1994-04-19
Tanner, Harry B.
Refrigeration
Automatic control
Refrigeration producer
62158, F25B 4104
Patent
active
053035623
ABSTRACT:
The microprocessor-based control system optimizes efficiency of the ON/OFF cycle by shutting the expansion valve fully closed at the beginning of each OFF cycle to maintain system pressure differential. At the beginning of each ON cycle the expansion valve is opened to an initial larger than average of three openings to allow the system to quickly reach steady state operating levels. Thereafter, the valve opening is reduced to an average of the last three steady state settings. After a predetermined time, control of the valve opening is passed to an adaptive control algorithm which adjusts the valve setting for optimized performance during steady state.
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Bahel Vijay
Herroon Gregroy P.
Hickey Mickey
Millet Hank
Pham Hung
Copeland Corporation
Tanner Harry B.
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