Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1983-11-01
1987-06-16
Davis, Jr., Albert W.
Heat exchange
Movable heating or cooling surface
Rotary drum
236 78D, 318610, B60H 100, G05B 1142
Patent
active
046730311
ABSTRACT:
A variable speed integrator for controlling the response time of a valve which regulates the amount of coolant flowing to a heat exchanger so as to control the temperature of the cooled substance output from the exchanger. The temperature of the cooled substance is sensed and compared to a set point temperature to determine an error temperature representing the difference between the sensed and set point temperatures. The error temperature is integrated by the variable speed integrator, the output of which is used to drive the valve into position. The control system monitors the rate of change of the sensed temperature to determine a low system gain. When the rate of temperature change indicates a low gain system, the gain of the integrator is increased to decrease the response time of the valve.
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Edwards, J. B. and Marshall, S. A., "Environmental Temperature Control", The Heating and Air Conditioning Journal, Apr. 1975, vol. 44, No. 521, p. 20.
Davis Jr. Albert W.
Smith Randolph A.
Sundstrand Corporation
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