Defrosting problem areas of refrigerated display cases

Details Defrosting problem areas of refrigerated display cases Defrosting problem areas of refrigerated display cases

1980-02-28

1981-08-25

King, Lloyd L.

Refrigeration

Processes

Defrosting or frost inhibiting

62256, 62278, 62282, F25B 4100, A47F 304, F25B 4700

Patent

active

042852048

ABSTRACT:
Defrost of a refrigerated display case, especially those cases in which refrigerated air curtains are directed across open front or open top areas, is improved by reversing the direction of the air circulating fans during a predetermined portion of the time during which the case is in a hot gas defrost mode. In a preferred example, the evaporator fan motors are reversed following the initiation of a hot gas defrost cycle, at a time during the cycle when air warmed by the defrosting evaporator coil becomes available. A thermally actuated switch means effects the reversal at the appropriate time, so that areas of the refrigerated display case that would normally be the last to receive the benefits of the warmed air, in particular the return air flue and tank drain, become the first to be subjected to the warming effect thereof.

REFERENCES:
patent: 2929227 (1960-03-01), Rainwater
patent: 2939295 (1960-06-01), Robson
patent: 3082612 (1963-03-01), Beckwith
patent: 3383877 (1968-05-01), Liebermann et al.
patent: 3937033 (1976-02-01), Beckwith et al.
patent: 4026121 (1977-05-01), Aokage et al.
patent: 4120174 (1978-10-01), Johnston
patent: 4144720 (1979-03-01), Subera et al.
patent: 4145893 (1979-03-01), Vogel
patent: 4182130 (1980-01-01), Ljung

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