Buckley et al. (1985) discuss using a selector to con-trol condensate temperature at 100∘C in a reflux drum,where the manipulated variable is the cooling water flowrate. If the condensate temperature becomes too low, the temperature controller reduces the cooling water flow rate,causing the cooling water exit temperature to rise. However,if the water temperature exceeds 50–60∘C, excessive foulingand corrosion can result. Draw a schematic diagram that uses aselector to keep the exit temperature below 50∘C. Determinethe valve action (A–O or A–C) for the flow control valve, andwhether the level controller should be reverse- or direct-acting
Buckley et al. (1985) discuss using a selector to con-trol condensate temperature at 100∘C in a reflux drum,where the manipulated variable is the cooling water flowrate. If the condensate temperature becomes too low, the temperature controller reduces the cooling water flow rate,causing the cooling water exit temperature to rise. However,if the water temperature exceeds 50–60∘C, excessive foulingand corrosion can result. Draw a schematic diagram that uses aselector to keep the exit temperature below 50∘C. Determinethe valve action (A–O or A–C) for the flow control valve, andwhether the level controller should be reverse- or direct-acting
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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Buckley et al. (1985) discuss using a selector to con-trol condensate temperature at 100∘C in a reflux drum,where the manipulated variable is the cooling water flowrate. If the condensate temperature becomes too low, the temperature controller reduces the cooling water flow rate,causing the cooling water exit temperature to rise. However,if the water temperature exceeds 50–60∘C, excessive foulingand corrosion can result. Draw a schematic diagram that uses aselector to keep the exit temperature below 50∘C. Determinethe valve action (A–O or A–C) for the flow control valve, andwhether the level controller should be reverse- or direct-acting
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