Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1975-03-31
1976-08-24
Davis, Jr., Albert W.
Heat exchange
Movable heating or cooling surface
Rotary drum
165 48, 165 61, 165 64, 165 14, 34213, F25B 2900
Patent
active
039761223
ABSTRACT:
This invention teaches a combination refrigerator-thawer cabinet that can be used as a conventional refrigerator or as a thawer for quick thawing frozen food without allowing the temperature of the food to exceed a predetermined guideline temperature, such as 45.degree.F. The disclosed unit is similar to a standard refrigerator having a cabinet for holding the food, but further has an auxiliary air circulating plenum located within the cabinet. Heating means are located within the plenum, and plenum fans draw the cabinet air into the plenum to be heated by the heating means and subsequently to be discharged back into the cabinet. The plenum air flow arrangement provides that the plenum outlets are adjacent the top and bottom cabinet walls and the plenum inlets are near the middle of the cabinet, and this minimizes the formation of hot spots where heated thawing air is blasted directly against the food. The auxiliary air circulating plenum fans remain in operation during the entire thaw cycle to improve the heat transfer characteristics; while the heating means are cycled on and off responsive respectively to sensed low and high cabinet air temperature, and preferably the refrigeration means is cycled on when the heating means is cycled off, and vise versa. This operation maintains a large average differential between the food temperature and the cabinet air temperature, again for quick thawing without exceeding some guideline maximum temperature.
REFERENCES:
patent: 2265633 (1941-12-01), Cornwell
patent: 3135316 (1964-06-01), Foster et al.
patent: 3199579 (1965-08-01), Foster et al.
patent: 3579849 (1971-05-01), Freeman
Davis Jr. Albert W.
Liles James D.
Lind Charles F.
McGraw-Edison Company
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