Methods for increasing efficiency in multiple-temperature forced-air refrigeration systems
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United States of America Patent
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Aug 6, 2002
Grant Date -
N/A
app pub date -
Feb 16, 2000
filing date -
Feb 17, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method using controlled forced-convection to couple (or de-couple) a refrigerant-evaporator thermally to a refrigerated compartment, and a method to use heat from a fresh food compartment (or other compartment maintained above 0C) of a two or more temperature refrigeration appliance to defrost a freezer evaporator automatically without using a controller or heater. When thermally coupled to its compartment, an evaporator can provide efficient cooling to the compartment. The ability to de-couple the evaporator from its compartment enables refrigerant flow through the evaporator at significantly different temperatures than its compartment, but without significant heat transfer. This ability enables using a single refrigeration system (with one or no valves) to remove heat (sequentially) at two or more different temperatures from two or more refrigerated compartments.
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