A hot liquid is cooled by cold water in a counter-current heat exchanger: shown in Fig. E8.15:
Question:
Temperature Th2 is to be controlled by adjusting flow rate, wc. The temperature sensor/transmitter (TT) is direct-acting. Based on safety considerations, should the control valve be air-to-open or air-to-close? Should the feedback controller be direct-acting or reverse-acting?
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First consider qualitatively how exit temperature T h2 responds to a change in cool...View the full answer
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Related Book For 
Process Dynamics and Control
ISBN: 978-1119385561
4th edition
Authors: Dale E. Seborg, Thomas F. Edgar, Duncan A. Mellichamp, Francis J. Doyle
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