Refrigeration – Automatic control – Diverse – cascade or compound refrigeration-producing system
Patent
1984-07-30
1986-06-17
Wayner, William E.
Refrigeration
Automatic control
Diverse, cascade or compound refrigeration-producing system
622283, 62510, F25B 110
Patent
active
045948585
ABSTRACT:
A refrigeration system characterized by a first stage booster compressor feeding multiple parallel connected second stage compressors in an otherwise conventional closed loop refrigeration system utilizing an economizer between the condenser and evaporator and returning economizer vapor to the inter-stage pressure point between the first stage and second stage compressors operates in a very flexible and highly efficient manner by driving the booster, first stage compressor at variable speed and the second stage compressor(s) at constant speed, at maximum capacity, with those machines incapable of being unloaded. The control system utilizing a sensor for sensing evaporator pressure, evaporator temperature or suction pressure, varies the speed of the drive motor for the first stage booster compressor to initially slow down the booster and secondly connect or disconnect the second stage compressor from the system. The booster is always operating and the economizer is always active in the system. Since the high stage machines do not unload, they always operate at their peak efficiency.
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Copeland Corporation
Wayner William E.
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