Method and apparatus for detecting and controlling the formation

Details Method and apparatus for detecting and controlling the formation Method and apparatus for detecting and controlling the formation

1985-05-17

1986-04-01

Wayner, William E.

Refrigeration

Automatic control

By accumulation on freezing surface, e.g., ice

62151, 250340, 340583, F25D 2102, G08B 1902

Patent

active

045789592

ABSTRACT:
In one exemplar embodiment, a method and apparatus are disclosed for detecting the accumulation of frost on the evaporator coils of refrigerating equipment. An emitter or source of electromagnetic radiation having a selected narrow band of wavelengths and a selected intensity directs the electromagnetic radiation at the frost. A detector spaced from the frost and emitter receives the narrow band of electromagnetic radiation and detects changes in the intensity of the radiation due to absorption or scattering of the radiation by the frost in a relation proportional to the thickness of the frost. Control means responding to the detected change in intensity of the radiation is provided to initiate a defrost cycle and control the accumulation of the frost on the evaporator coil surfaces. Other embodiments of the invention include a liquid level detector and a physical state phase change detector.

REFERENCES:
patent: 2371259 (1945-03-01), Patterson
patent: 2428667 (1947-10-01), Henriquez
patent: 2849617 (1958-08-01), Karasek
patent: 2849618 (1958-08-01), Smith
patent: 3045223 (1962-07-01), Kapany et al.
patent: 3188828 (1965-06-01), Wayne
patent: 3280577 (1966-10-01), Kobayashi et al.
patent: 3910701 (1975-10-01), Henderson et al.

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