Refrigeration – Automatic control – By accumulation on freezing surface – e.g. – ice
Patent
1984-05-21
1987-03-17
Tanner, Harry
Refrigeration
Automatic control
By accumulation on freezing surface, e.g., ice
62128, 62151, 324 585B, F25D 2102, G01R 2704
Patent
active
046497137
ABSTRACT:
A sensing and control device is provided for monitoring the build up of frost, ice and condensate on the cooling coils of refrigeration unit. The microwave unit is placed a fixed distance away from a cooling coil and provides an emitted wave and reflected wave. The reflected wave, and the resulting standing wave, shift in spacial phase which differs due to the accumulation of ice or frost and provides a voltage change which is observed by an electronic circuit to shut off the cooling unit while activating a defrost cycle or merely keeping the refrigeration shut off until the ice melts. The sensing and control unit is also used to sense the removal of ice and frost by heating of the defrost cycle and thus establish the termination of defrost cycle and restoration of refrigeration. The microwave sensing device permits the refrigeration unit to be cycled on and off to prevent an excessive build-up of ice which would dramatically lower unit efficiency by preventing the circulation of cooling air across the heat exchanger or coil as it is called to circulate cool air into the contiguous space.
REFERENCES:
patent: 3836846 (1974-09-01), Overall et al.
patent: 3946286 (1976-03-01), Kinnunen et al.
patent: 4045971 (1977-09-01), Brenner, Jr.
patent: 4054255 (1977-10-01), Magenheim
patent: 4109481 (1978-08-01), Peek
patent: 4232528 (1980-11-01), Behr
patent: 4470123 (1984-09-01), Magenheim et al.
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