Question: Luyben and Vinante developed a distillation column model relating temperatures on the 4th and 17th trays from the bottom of the column (T4, T17,) to

Luyben and Vinante developed a distillation column model relating temperatures on the 4th and 17th trays from the bottom of the column (T4, T17,) to the reflux ratio R and the steam flow rate to the reboiler S:1.26e-03 7.05s + 1 -2.75e-18 4,28e 0.35 9.0s + 1 -2.16e Tr(s)Compare the closed-loop set-point changes that result from the T17-R/T4-S pairing and the Ziegler- Nichols continuous cycling method in Chapter 12.Consider two cases:(a) A set-point change is made in each loop with the other loop in manual.(b) The set-point changes arc made with both controllers inautomatic.

1.26e-03 7.05s + 1 -2.75e-18 4,28e 0.35 9.0s + 1 -2.16e Tr(s) 8.25s + 1 R(s) S(s) Ta(s) 8.25s + 1

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