The figure below shows a heat exchanger with no phase change. The "Process in stream comes from upstream units and you can only measure its flow (Fi) and temperature (Ti) but you cannot change these values. CTS is the cooling water from the cooling tower and CTR is the return of the cooling water to the cooling tower. You can readjust the flow (Fw) of the cooling water if needed. The control objective is to keep the "Process out" stream at a target temperature Ts. (a) Considering the variables Fi, Ti, Fo, To and Fw; What is/are the disturbance/s and the manipulated variable/s? (b) Show how you can control this heat exchanger in order to meet the control objective. Process In (FI, TI) Process Out (Fo, To) CTS (FW)
The figure below shows a heat exchanger with no phase change. The "Process in stream comes from upstream units and you can only measure its flow (Fi) and temperature (Ti) but you cannot change these values. CTS is the cooling water from the cooling tower and CTR is the return of the cooling water to the cooling tower. You can readjust the flow (Fw) of the cooling water if needed. The control objective is to keep the "Process out" stream at a target temperature Ts. (a) Considering the variables Fi, Ti, Fo, To and Fw; What is/are the disturbance/s and the manipulated variable/s? (b) Show how you can control this heat exchanger in order to meet the control objective. Process In (FI, TI) Process Out (Fo, To) CTS (FW)
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
Transcribed Image Text:The figure below shows a heat exchanger with no phase change. The "Process in stream comes from
upstream units and you can only measure its flow (Fi) and temperature (Ti) but you cannot change these
values. CTS is the cooling water from the cooling tower and CTR is the return of the cooling water to the
cooling tower. You can readjust the flow (Fw) of the cooling water if needed. The control objective is to
keep the "Process out" stream at a target temperature Ts.
(a) Considering the variables Fi, Ti, Fo, To and Fw; What is/are the disturbance/s and the manipulated
variable/s?
(b) Show how you can control this heat exchanger in order to meet the control objective.
Process In (FI, TI)
Process Out (Fo, To)
CTS (FW)
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