Question: Consider the evaporator and control system in Figure 13.6. (a) Should each control valve be air-to-open (AO) or air-to-close (AC)? (b) Should each PI controller

Consider the evaporator and control system in Figure 13.6.
(a) Should each control valve be air-to-open (AO) or air-to-close (AC)?
(b) Should each PI controller be direct-acting or reverse-acting?

(I/P PC Solvent D, xD PT I/P P, T, p (LT P AC Steam LC I/P AT Feed F, *, xf, Tp Product В, Хв Figure 13.6 Evaporator

(I/P PC Solvent D, xD PT I/P P, T, p (LT P AC Steam LC I/P AT Feed F, *, xf, Tp Product , Figure 13.6 Evaporator control strategy for Case (a). ---- KD-

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