Book: Process Dynamics and Control, Third Edition or Fourth Edition, by D. E. Seborg, T. F. Edgar, D. A. Mellichamp, F. J. Doyle III, John Wiley & Sons, Inc, 2011 A circulating cooling water system is used to cool a hot oil stream in a shell and tube heatexchanger. The cooling water is first pumped through a refrigerated cooler and then through theheat exchanger. At the design flow rate of q = 500 gpm, the water pressure drop through therefrigerated cooler is 15 psi, and the pressure drop through the heat exchanger is 25 psi. Thewater pressure drops through the refrigerated cooler and heat exchanger are proportional to theflow rate squared. The water supply pump produces a constant pressure head of 80 psig toovercome pressure losses in the cooler, heat exchanger and control valve. At the end of thecirculating cooling water system, the pressure is at atmospheric pressure.Assume an equal percentage control valve (R = 20) in which the stem position (I) = 0.50 at thedesign flow rate. The specific gravity of the cooling water is 1.0(a)(b)Determine the valve coefficient Cy.Calculate the water flow rate in gpm through a wide-open control valve.Information that may or may not be useful'ΔΡ.9 = C,f (€)g.Quick-opening valve: 1 ( € ) = vELinear valve: f ( l) = lEqual-percentage valve: f ( €) = R-1

The control valve is a most commonly used final control element which regulates the fluid in the…

Answered: ΔΡ. q = C,f (€) Quick-opening valve: 1…

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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Book: Process Dynamics and Control, Third Edition or Fourth Edition, by D. E. Seborg, T. F. Edgar, D. A. Mellichamp, F. J. Doyle III, John Wiley & Sons, Inc, 2011

A circulating cooling water system is used to cool a hot oil stream in a shell and tube heat
exchanger. The cooling water is first pumped through a refrigerated cooler and then through the
heat exchanger. At the design flow rate of q = 500 gpm, the water pressure drop through the
refrigerated cooler is 15 psi, and the pressure drop through the heat exchanger is 25 psi. The
water pressure drops through the refrigerated cooler and heat exchanger are proportional to the
flow rate squared. The water supply pump produces a constant pressure head of 80 psig to
overcome pressure losses in the cooler, heat exchanger and control valve. At the end of the
circulating cooling water system, the pressure is at atmospheric pressure.
Assume an equal percentage control valve (R = 20) in which the stem position (I) = 0.50 at the
design flow rate. The specific gravity of the cooling water is 1.0
(a)
(b)
Determine the valve coefficient Cy.
Calculate the water flow rate in gpm through a wide-open control valve.
Information that may or may not be useful
'ΔΡ.
9 = C,f (€)
g.
Quick-opening valve: 1 ( € ) = vE
Linear valve: f ( l) = l
Equal-percentage valve: f ( €) = R-1

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