(a) Rework Example R9-1 for the case of a 5 °F decrease in the outlet temperature when the controlled input variable is the reactant feed rate.
(b) Consider a 5 °F drop in the ambient temperature, when the controlled variable is the inlet temperature, 71,,.
(c) Use each of the controllers (P with kc = 10, I with τI, = 1.0 h, D with τD = 0.1 h) to keep the reactor temperature at the unstable steady state (i.e., T = 112.5 °F and X = 0.3).
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