Task 1: Graphical Diagrams for Minimum Energy Consumption Table 1 provides a list of process streams that should be heat integrated. The utility system is represented by steam (ST) and cooling water (CW) that are available in sufficient amounts on the production site ("var" is short for variable, which means that the amounts of utilities required are unknown and should be determined). It is assumed that ATmin -10°C gives a reasonable economic trade-off between operating cost (energy) and investment cost (heat exchangers). Table 1: Data for Streams and Utilities Stream T₂(°C) T, (°C) mCp (kW/°C) HI 200 70 50 H2 300 60 10 C1 90 180 40 40 240 30 ST 250 250 (var) CW 10 20 (var) a) Sketch the overall heating and cooling curves (the Composite Curves) for this heat integration problem that consists of four process streams. Notice that for this sub- task (a) it is not required to satisfy ATmin -10°C. b) Try to shift in a parallel manner the overall heating curve until it lies completely underneath the cooling curve, and that the minimum vertical distance between the two curves is ATmin = 10°C. Determine graphically and approximately the minimum external heating require- ments (QH,min) as well as the minimum external cooling requirements (Qc.min). c) Where is the process Pinch point (given as hot and cold Pinch temperatures)?
Task 1: Graphical Diagrams for Minimum Energy Consumption Table 1 provides a list of process streams that should be heat integrated. The utility system is represented by steam (ST) and cooling water (CW) that are available in sufficient amounts on the production site ("var" is short for variable, which means that the amounts of utilities required are unknown and should be determined). It is assumed that ATmin -10°C gives a reasonable economic trade-off between operating cost (energy) and investment cost (heat exchangers). Table 1: Data for Streams and Utilities Stream T₂(°C) T, (°C) mCp (kW/°C) HI 200 70 50 H2 300 60 10 C1 90 180 40 40 240 30 ST 250 250 (var) CW 10 20 (var) a) Sketch the overall heating and cooling curves (the Composite Curves) for this heat integration problem that consists of four process streams. Notice that for this sub- task (a) it is not required to satisfy ATmin -10°C. b) Try to shift in a parallel manner the overall heating curve until it lies completely underneath the cooling curve, and that the minimum vertical distance between the two curves is ATmin = 10°C. Determine graphically and approximately the minimum external heating require- ments (QH,min) as well as the minimum external cooling requirements (Qc.min). c) Where is the process Pinch point (given as hot and cold Pinch temperatures)?
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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Transcribed Image Text:Task 1:
Graphical Diagrams for Minimum Energy Consumption
Table 1 provides a list of process streams that should be heat integrated. The utility system
is represented by steam (ST) and cooling water (CW) that are available in sufficient amounts
on the production site ("var" is short for variable, which means that the amounts of utilities
required are unknown and should be determined). It is assumed that ATmin -10°C gives a
reasonable economic trade-off between operating cost (energy) and investment cost (heat
exchangers).
Table 1:
Data for Streams and Utilities
Stream
T₂(°C)
T, (°C)
mCp (kW/°C)
HI
200
70
50
H2
300
60
10
C1
90
180
40
40
240
30
ST
250
250
(var)
CW
10
20
(var)
a) Sketch the overall heating and cooling curves (the Composite Curves) for this heat
integration problem that consists of four process streams. Notice that for this sub-
task (a) it is not required to satisfy ATmin -10°C.
b) Try to shift in a parallel manner the overall heating curve until it lies completely
underneath the cooling curve, and that the minimum vertical distance between the
two curves is ATmin = 10°C.
Determine graphically and approximately the minimum external heating require-
ments (QH,min) as well as the minimum external cooling requirements (Qc.min).
c) Where is the process Pinch point (given as hot and cold Pinch temperatures)?
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