Refrigeration – Processes – Defrosting or frost inhibiting
Patent
1979-09-18
1982-02-09
Tapolcai, Jr., William E.
Refrigeration
Processes
Defrosting or frost inhibiting
62256, 62282, F25D 2112
Patent
active
043144535
ABSTRACT:
A refrigerated display case for displaying refrigerated products. The display case is formed in a cabinet that has an interior area for holding the refrigerated products. The cabinet has an access opening either in its top wall or its front wall for enabling access to the refrigerated products. A first air conduit extends around the cabinet and has inlet and outlet air openings for directing air across the access opening in the cabinet. During a refrigeration cycle of operation, the air traveling through the first air conduit is refrigerated by a set of evaporator coils. A second air conduit extends partially around the cabinet along a path lying outwardly of the first air conduit. The second air conduit has an outlet opening positioned adjacent to the outlet opening of the first air conduit. During the refrigeration cycle, air is emitted from the outlet opening of the second air conduit along a path across the access opening of the cabinet but lying outwardly of the air emitted from the outlet opening of the first air conduit. The inlet opening of the second air conduit is positioned so as to open into the first air conduit at a location after the air has passed through the air circulating mechanism but before the air has passed through the evaporator coils. This display case can be operated either in a refrigeration mode of operation where the air is circulated in a forward direction through the first and second air conduits with the air passing through the first conduit being refrigerated or a defrost mode of operation where ambient air is circulated through the first and second air conduits in a reverse direction. During the defrost mode of operation, ambient air is drawn through the outlet openings into the first and second air conduits. The ambient air passing through the second air conduit helps to transfer heat to the air passing through the first air conduit and to the evaporator coils both by means of conduction and convection so as to assist in the defrosting of the evaporator coils.
REFERENCES:
patent: 3289432 (1966-12-01), Brennan et al.
patent: 3392544 (1968-07-01), Perez
patent: 3528258 (1970-09-01), Brennan
patent: 3675440 (1972-07-01), Ibrahim
patent: 3898864 (1975-08-01), Steelman
patent: 4026121 (1977-05-01), Aokage et al.
Tapolcai, Jr. William E.
Tyler Refrigeration Corporation
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