Air driers and control circuits therefor

Details Air driers and control circuits therefor Air driers and control circuits therefor

1978-03-20

1980-04-01

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 55, 219497, 219510, F26B 1104

Patent

active

041954157

ABSTRACT:
An air drier has a control circuit for controlling heating of air entering the drier to maintain the difference between the temperature of air leaving the drier and that of ambient or incoming air at a predetermined value. The control circuit is compensated for variations in ambient air temperature such that as ambient air temperature decreases the control circuit tends to maintain the temperature difference at a higher value to ensure that the drying times are not unduly lengthened. A signal for terminating operation of the drier is derived by monitoring the difference between the actual value of the temperature difference and the desired value, and the mean heater power, and for terminating the drying cycle when a signal representative of the sum of the two values passes through a predetermined value.

REFERENCES:
patent: 3242585 (1966-03-01), Worst
patent: 3401464 (1968-09-01), Fogt et al.
patent: 3526968 (1970-09-01), Triplett
patent: 3553428 (1971-01-01), McGhee
patent: 3975832 (1976-08-01), Mori et al.
patent: 4112589 (1978-09-01), Palfrey et al.

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