Frost detector

Details Frost detector Frost detector

1978-03-16

1980-11-11

Wayner, William E.

Refrigeration

Automatic control

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

340583, 250239, G08B 1902, F25D 2102

Patent

active

042325285

ABSTRACT:
A refrigeration system is provided with an improved frost detector for detecting frost on an evaporator coil of the system. The detector includes a saddle mounting structure adapted for direct mounting to the tubular coils conventionally employed in condensers and evaporators of refrigeration systems. An energy source and a sensor carried by the mounting structure are positioned on opposite sides of the tubular coil. The sensor is irradiated by the energy source until frost growth on the coil tube obstructs the line of sight path between the source and the sensor. Means are provided for adjusting the line of sight path with respect to the coil tube so that the thickness of frost permitted to accumulate before defrost actuation can be varied for particular applications. By utilizing a narrow beam device as an irradiation source, very precise control of the defrost cycle can be obtained.

REFERENCES:
patent: 2297370 (1942-09-01), Siedle
patent: 3188828 (1965-06-01), Wayne
patent: 3204109 (1965-08-01), Goodwin
patent: 3822384 (1974-07-01), Chapron et al.
patent: 3908129 (1975-09-01), Akers

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