Transcript ME 414 Project 2 Heat Exchanger Design

ME 414 Project 2
Heat Exchanger Design
Team Members:
Diego Quevedo
Javier Angulo
Colin Sanberg
Mike Abel
Avery Sheets
Department of Mechanical
Engineering
December 12, 2006
Professor: John Toksoy
Introduction
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Problem Statement
Objectives
Summary of Results
Design Process
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DOE, Main Effects Plots, Optimization
Conclusion
Problem Statement
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Must cool a chemical from 40 C to 25 C
Heat exchanger length can not exceed 7 m
Heat exchanger shell diameter can not exceed
2m
Shell mass flow rate is 33.3 kg/s
Objectives
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Obtain a heat transfer ratio of 1
Minimize pressure drop
Minimize weight
Minimize cost
Summary of Results
Qcalc
Weight
ΔPtube
ΔPshell
2.087 MW
958.61 kg
2435.46 Pa
951.59 Pa
Potential Parameters
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Shell Mass Flow Rate
Shell Inner Diameter
Shell Thickness
Shell Material
Flow Type
Pitch Type
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Tube Outer Diameter
Tube Length
Tube Thickness
Tube Material
Tube Layout Angle
Tube Passes
First Decisions
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Flow Type
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Pitch Type
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Square Pitch
Tube Layout
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Counter Flow
90 degrees
Material
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Aluminum-Low density, high thermal conductivity
Design of Experiment
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Using the 6 parameters outlined earlier
Determine 20% range of parameters
Run DOE program in MATLAB
Export the output file to Minitab
Obtain Main Effects Plots, Interaction Plots,
and Pareto Charts
Main Effects Plots
Re-Analyze Parameters
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Narrow the original 6 parameters to 4
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Tube OD
Shell ID
Tube Length
Mass Flow Rate
Pareto Charts
Optimization
1st
Iteration
2nd
Iteration
Final
Iteration
Optimization
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Optimal values taken
from Minitab
Values input into
MATLAB
Tube
OD
Shell
ID
Tube
Len
Mass
Flow
.0091m .5221m 4.210m 45 kg/s
Conclusion
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Optimum values from
Minitab input into
MATLAB
Values in MATLAB
better than values in
Minitab
Qcalc
2.087
MW
W
ΔPtube ΔPshell
958.61 2435.46 951.59
kg
Pa
Pa
Conclusion
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Ratio = 1.00
Maintenance Cost
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Material Cost
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Small pressure losses mean less strain on the
pump
2113.37lbs*$1.20/lb (Al) = $2536.05
Balance between material and maintenance
cost
References
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Aluminum Price
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http://www.purchasing.com/article/CA6395531.ht
ml
ME 414 Course Notes
Questions