Defrosting apparatus

Details Defrosting apparatus Defrosting apparatus

1981-11-09

1984-02-21

Makay, Albert J.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62156, 62234, 219497, 338 22R, F25D 2106

Patent

active

044322119

ABSTRACT:
A defrosting apparatus for removing frost deposited on a cooler of a refrigerator or an air conditioner employs a defrosting heater exhibiting a positive temperature coefficient of resistance which changes sharply at a specific temperature. A specific rate of change of the heater current of the defrosting heater is detected, and on the basis of the detected current change rate, stopping or starting of current supply to the defrosting heater is controlled. The defrosting heater is an organic type heater or an inorganic ceramic type heater possessing the function of self-temperature control.

REFERENCES:
patent: 3793716 (1974-02-01), Smith-Johannsen
patent: 4162379 (1979-07-01), Sebens et al.
patent: 4177376 (1979-12-01), Horsma et al.
patent: 4277673 (1981-07-01), Kelly
patent: 4334148 (1982-06-01), Kampe

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