Question: A hot liquid is cooled by cold water in a counter-current heat exchanger: shown in Fig. E8.15: Temperature T h2 is to be controlled by

A hot liquid is cooled by cold water in a counter-current heat exchanger: shown in Fig. E8.15:

Wc, Tc2 Wc, T.1 Heat exchanger TT Wh, Th1 Wh, Th2 Figure E8.15

Temperature T_h2 is to be controlled by adjusting flow rate, w_c. 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?

Wc, Tc2 Wc, T.1 Heat exchanger TT Wh, Th1 Wh, Th2 Figure E8.15

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