Frost control system

Details Frost control system Frost control system

1978-05-30

1980-08-05

Wayner, William E.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62209, F25D 2106, F25B 4100

Patent

active

042155541

ABSTRACT:
Frost control apparatus is disclosed for a temperature conditioning system such as a heat pump or the like, wherein a compressor circulates a volatile fluid through the closed system. Frost-buildup on the indoor and outdoor coils of the system is controlled by means of respective defrost cycles which occur in accordance with the conditions sensed by temperature sensing elements positioned at various points in the system. The defrost cycle for the indoor coil is maintained throughout a predetermined temperature range of ambient indoor air. The defrost cycle for the outdoor coil is initiated as a function of the differential between the temperature of the outdoor coil and that of ambient outdoor air and it varies in magnitude as a function of ambient outdoor air temperature. The termination of the outdoor coil defrost cycle is determined by a sensed temperature condition.

REFERENCES:
patent: 2988896 (1961-06-01), Swart, Jr.
patent: 2988897 (1961-06-01), McGrath
patent: 3280579 (1966-10-01), Kayl
patent: 3466888 (1969-09-01), Kyle
patent: 3553975 (1971-01-01), Sakamoto
patent: 3578754 (1971-05-01), Kusuda et al.
patent: 3633374 (1972-02-01), Canter
patent: 3681933 (1972-08-01), Check, Jr.
patent: 3950962 (1976-04-01), Odashima
patent: 4109639 (1978-08-01), Keegan
patent: 4129993 (1978-12-01), Schotten

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