Answered: I/P < - Electrical signal Pneumatic…

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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Question

Consider the schematic diagram of a controlled blending process shown in Fig. The control objective is to control the mass fraction of the exit stream,x, by adjusting inlet flowrate,w₂, using a feedback controller. The mass fractions ofa key chemical component in the inlet streams,x₁ and x₂,are constant, and mass flow rate w₁ is a disturbance variable.The liquid volumeV is constant. The composition sen-sor/transmitter (AT) and the current-to-pressure transducer(I/P) are both direct-acting devices.What is theminimumamount of information you wouldneed in order to decide whether the feedback controller, AC,should be reverse-acting or direct-acting?

I/P <
- Electrical signal
Pneumatic signal
AC --Set point
x2 = 1
w2
x1
wi
Xm
AT
V

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