Refrigeration – Automatic control – By accumulation on freezing surface – e.g. – ice
Patent
1987-07-13
1989-05-23
Tanner, Harry B.
Refrigeration
Automatic control
By accumulation on freezing surface, e.g., ice
62158, F25D 2102
Patent
active
048318337
ABSTRACT:
Apparatus for detecting frost buildup on an evaporator (34) of a refrigeration system (10) includes an air velocity sensor (42) in the air flow path. The sensor is connected to an analog to digital converter (46) which delivers binary signals representative of air velocity to a microcomputer (50) which includes a processor and a memory. Microcomputer (50) is programmed to prompt an operator through a screen (56) at a user station (52) to input an air flow reduction factor at a keyboard (54). The microcomputer uses the air flow reduction factor and the velocity sensed when the evaporator is fully defrosted to calculate a defrost initiation value. When the air velocity sensed at the sensor is no longer greater than the initiation value the microcomputer generates a defrost initiation signal. The microcomputer also includes a timer clock and periodically prints at a printer (58) the time and the velocity sensed.
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Duenes Patricia
Kenyon Richard L.
Scapes John N.
Schild Eugene H.
Strong Arthur P.
Jocke Ralph E.
Parker Hannifin Corporation
Tanner Harry B.
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