System and method for controlling defrost cycles of a...

Details System and method for controlling defrost cycles of a... System and method for controlling defrost cycles of a...

2011-04-12

2011-04-12

Tyler, Cheryl J (Department: 3744)

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

C062S080000, C062S151000, C062S154000, C062S234000, C062S276000

Reexamination Certificate

active

07921660

ABSTRACT:
Methods, systems and computer readable code for controlling a defrost cycle of a refrigeration device are disclosed. According to some embodiments, a defrost command is issued to a defrost heater at a time determined at least in part by a total wasted energy parameter of the compressor for at least one time interval. In some embodiments, time interval includes a plurality of runtimes, and the total wasted energy parameter of a runtime is measured relative to a chosen reference runtime such as a minimum energy runtime after a defrost or an early runtime after a defrost. Optionally, a sequence of wasted energy parameters of the compressor for a sequence of time intervals is analyzed, and then a correction is performed on at least one wasted energy parameter.

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patent: 2003/0084672 (2003-05-01), Pham et al.

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