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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

Heat Flux Measurement Used for Feedforward Temperature Control

Get access (open in a dialog) DOI: 10.1615/IHTC10.3100
pages 261-266

摘要

The concept of using measurement of surface heat flux to provide input to a feedforward temperature controller is explored. Because heat flux is proportional to the time rate of change of the temperature, the heat flux measurement predicts what the temperature is going to be in the future. The combination of a surface temperature sensor and heat flux sensor is incorporated in a Heat Flux Microsensor. Because the microsensor has fast time response and low electrical noise, it provides an ideal signal for the feedforward control algorithm.
Computer simulations and simple plate experiments were performed for a step change in the convection boundary condition to test the feedforward concept. System responses for feedback and feedforward control algorithms were compared. Because the feedforward control loop eliminated the initial temperature disruption due to the disturbance, an integral measure of the temperature deviation from the setpoint temperature was reduced by approximately 90% and the maximum temperature excursion from the setpoint was decreased by 70%. The experiments followed the trends of the computer simulation in all cases.