Defrost control system for refrigeration system

Details Defrost control system for refrigeration system Defrost control system for refrigeration system

1980-10-20

1982-02-23

Tapolcai, Jr., William E.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62140, 7386235, 416 61, F25D 2106

Patent

active

043163653

ABSTRACT:
An evaporator coil defrost control system for a refrigeration system comprising refrigerant compression means, a condenser coil, an evaporator coil, and an electric motor operated fan positioned adjacent to said evaporator coil and adapted, when energized, to blow air through said evaporator coil, said defrost control system comprising: strain sensing means connected to said fan blades and adapted to measure force applied to said fan and to produce a signal indicative of said measured force; controller means connected to said strain sensing means to receive the signal therefrom and having operative connections to said system, said controller being adapted to place said system in a defrost mode of operation upon said signal of said strain sensing means having a characteristic indicative of a significant frost build-up on said evaporator coil.

REFERENCES:
patent: 2939295 (1960-06-01), Robson
patent: 3397550 (1968-08-01), Giwosky
patent: 3402729 (1968-09-01), Richmond et al.
patent: 3573520 (1971-04-01), Dorshimer
patent: 3744300 (1973-07-01), Fleury
patent: 4104888 (1978-08-01), Reedy et al.

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