Refrigeration – Processes – Defrosting or frost inhibiting
Patent
1997-09-19
1999-02-09
Tanner, Harry B.
Refrigeration
Processes
Defrosting or frost inhibiting
62180, 62187, 62282, F25D 1708
Patent
active
058679944
ABSTRACT:
The disclosed refrigeration appliance includes a fresh-food compartment and a freezer compartment with a plenum or duct therebetween housing a single evaporator and at least one fan for establishing air flows through the plenum in opposite directions, an air flow pattern through the plenum and the fresh-food compartment alternating with an air flow pattern through the plenum and the freezer compartment. A condenser, a single compressor and a refrigerant circuit serve to complete the refrigeration system. One-way air valves are located at opposite ends of the plenum, on opposing sides of the fan, and provide communication between the food compartments and the plenum. Two one-way air valves are located at each end of the plenum, one in a wall of the freezer compartment and the other in a wall of the fresh-food compartment. The one-way air valves allow an air flow to be established, selectively, either through the plenum in the fresh-food compartment or through the plenum and the freezer compartment. Operating in a fresh-food compartment cooling mode, air from the fresh-food compartment circulating over the evaporator coils serves to defrost the evaporator coils. Advantages include use of a single evaporator to cool both the freezer compartment and a fresh-food compartment and provision of a defrost cycle without need for a separate heater.
REFERENCES:
patent: 3248894 (1966-05-01), Harbour
patent: 3500655 (1970-03-01), Lyons
patent: 4122687 (1978-10-01), McKee
patent: 5375428 (1994-12-01), LeClear
patent: 5732561 (1998-03-01), Kim
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