Refrigeration – Automatic control – Refrigeration producer
Patent
1984-08-09
1986-01-28
Wayner, William E.
Refrigeration
Automatic control
Refrigeration producer
62117, 62DIG17, F25B 4100
Patent
active
045662886
ABSTRACT:
A control system for a compression type refrigeration unit with an air-cooled condenser exposed to outside ambient conditions. In cooler weather the head pressure is maintained by backflooding the condenser which limits the condensing surface. This also subcools the liquid in the condenser. A bypass line from a point between the outlet of the condenser and the receiver inlet connects with the liquid supply line leaving the receiver and directs this subcooled liquid to the expansion valve. A solenoid valve in the bypass line is controlled by a liquid level sensor or subcooling sensor in the line leaving the condenser. This increases the capacity of the evaporator as less evaporation is required to remove the sensible heat-down to the evaporating temperature. In warmer weather, the system automatically reverts to a conventional condensing mode.
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