Answered: A PID controller is used to control the…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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A PID controller is used to control the temperature of a jacketed batch reactor by adjusting the flow rate of coolant tothe jacket. The temperature controller has been tuned to pro-vide satisfactory control at the nominal operating conditions.Would you anticipate that the temperature controller mayhave to be retuned for any of the following instrumentation changes? Justify your answers.(a)The span of the temperature transmitter is reduced from30 to 15∘C.(b)The zero of the temperature transmitter is increased from 50 to 60∘C.(c)The control valve “trim” is changed from linear to equal percentage.(d)The temperature of the coolant leaving the jacket is used as the controlled variable instead of the temperature in the reactor.

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