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Qi (m3/min] Kp H' Hsp | Hp Km P', Kjp E P' G(s) K, [m3/min] TS + 1 [m] [m] [%] [%] [%] [psi) Hm H' Km [%] [m]

Qi (m3/min] Kp H' Hsp | Hp Km P', Kjp E P' G(s) K, [m3/min] TS + 1 [m] [m] [%] [%] [%] [psi) Hm H' Km [%] [m]

Introduction to Chemical Engineering Thermodynamics
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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Consider proportional-only control of the level controlsystem in Fig. The level transmitter has a span of 10 ft.and a zero of 15 ft. Recall that the standard instrument ranges are 4 to 20 mA and 3 to 15 psia. The nominal design condi-tions are h=20 ft. The controller has a gain of 5 while thegain for the control valve is Kᵥ=0.4 cfm/psi, respectively. The time constant for the tank is ? =5 min. After the set-point ischanged from 20 to 22 ft, the tank level eventually reaches anew steady-state value of 21.92 ft.(a)What is the offset?(b)What are the gains Kₘ and Kₚ in Fig? (Give theirunits also)(c)How could the controller be modified to obtain zero offset?

Qi (m3/min] Kp H' Hsp | Hp Km P', Kjp E P' G(s) K, [m3/min] TS + 1 [m] [m] [%] [%] [%] [psi) Hm H' Km [%] [m]
Transcribed Image Text:Qi (m3/min] Kp H' Hsp | Hp Km P', Kjp E P' G(s) K, [m3/min] TS + 1 [m] [m] [%] [%] [%] [psi) Hm H' Km [%] [m]
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