Refrigeration – Processes – Defrosting or frost inhibiting
Patent
1978-05-22
1980-02-19
Davis, Jr., Albert W.
Refrigeration
Processes
Defrosting or frost inhibiting
62282, 165 17, F25D 2112
Patent
active
041887948
ABSTRACT:
A food storage compartment of a freezer accumulates frost. At selected times, a heat source of large thermal capacity transforms a retained body of water or ice to steam. The steam condenses upon and melts the frost. A portion of the melt is retained to provide a source of steam in a subsequent defrosting period. The heat source operates at a temperature substantially above the boiling temperature of water and is permanently attached to a concavity or other reservoir which retains the water substance.
In a preferred embodiment, the freezer is part of a system of domestic appliances using a liquid phase thermal exchange fluid to transfer heat between a plurality of appliances and thermal reservoirs maintained at hot and cold temperatures. The retained water substance is ice in a concavity at the bottom of the freezer. During a defrosting period, valves are positioned to allow flow of hot thermal exchange fluid as a heat source adjacent to the concavity. The ice in the concavity rapidly melts and forms steam which melts the frost. The melt flows into the concavity and surplus melt flows into a drain opening above the concavity. When flow of hot thermal exchange fluid stops, freezer temperature returns to sub-freezing and water in the concavity freezes to remain for the next defrosting period.
REFERENCES:
patent: 3267689 (1966-08-01), Liebert
Davis Jr. Albert W.
Focarino Margaret A.
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