Refrigeration system defrost control

Details Refrigeration system defrost control Refrigeration system defrost control

1974-04-04

1976-03-23

Wayner, William E.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62176, 733365, 338 35, F25D 2108

Patent

active

039452174

ABSTRACT:
A refrigeration system having an improved defrost control including a thermal relay, a bimetal thermostat, and a thick film/hybrid microelectronic element responsive to cumulative humidity of the refrigerated air comprising a moisture sensor/cumulator portion and a control circuit portion on a ceramic substrate. The sensor/cumulator absorbs water vapor at a rate proportional to the relative humidity of the refrigerated air and activates a heater element of the thermal relay to initiate a defrost period. The element is reset by thermally removing a preselected amount of the absorbed water vapor. The defrost period is terminated by a bimetal thermostat. Alternatively, a thermal responsive resistor may be included in the control circuit to terminate the defrost period.

REFERENCES:
patent: 2424735 (1947-07-01), Boothroyd
patent: 2806991 (1957-09-01), White
patent: 2820304 (1958-01-01), Horecky
patent: 2976188 (1961-03-01), Kohl
patent: 3029610 (1962-04-01), Armentrout
patent: 3465534 (1969-05-01), Sutton, Jr. et al.
patent: 3679872 (1972-07-01), Lauck

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