Refrigeration – Automatic control – Refrigeration producer
Patent
1985-01-11
1986-11-11
Tanner, Harry
Refrigeration
Automatic control
Refrigeration producer
62225, 622283, 62130, F25B 4104, F25B 4900, G01K 1300
Patent
active
046215026
ABSTRACT:
A refrigeration system for a display case including electronic means for controlling an expansion valve and a refrigerant compressor used in the system. The expansion valve is cycled between open and close positions to modulate refrigerant flow into an evaporator coil. A microprocessor controls the operation of the expansion valve in response to: (a) the relationship of the temperature of air that has passed over the evaporator coil to multiple upper and lower limits (b) time integrated temperature deviations beyond preselected limits (c) upward or downward trend of the differential in temperature in the refrigerant during its flow through the evaporator coil, and (d) extreme deviation of the temperature of air that has passed over the evaporator coil. Compressor cut-in and cut-out pressures are also adjusted by the control in response to these air and refrigerant temperatures. In addition, the various limits may be adjusted according to a night setback schedule, and an alarm is provided to warn of relatively long-term deviation of the controlled temperature.
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patent: 4523435 (1985-06-01), Lord
patent: 4527399 (1985-07-01), Lord
Fung Kwok K.
Ibrahim Fayez F.
Tanner Harry
Tyler Refrigeration Corporation
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