ME 414 Project 2 Heat Exchanger Design
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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
Problem Statement
Objectives
Summary of Results
Design Process
DOE, Main Effects Plots, Optimization
Conclusion
Problem Statement
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
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
Shell Mass Flow Rate
Shell Inner Diameter
Shell Thickness
Shell Material
Flow Type
Pitch Type
Tube Outer Diameter
Tube Length
Tube Thickness
Tube Material
Tube Layout Angle
Tube Passes
First Decisions
Flow Type
Pitch Type
Square Pitch
Tube Layout
Counter Flow
90 degrees
Material
Aluminum-Low density, high thermal conductivity
Design of Experiment
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
Narrow the original 6 parameters to 4
Tube OD
Shell ID
Tube Length
Mass Flow Rate
Pareto Charts
Optimization
1st
Iteration
2nd
Iteration
Final
Iteration
Optimization
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
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
Ratio = 1.00
Maintenance Cost
Material Cost
Small pressure losses mean less strain on the
pump
2113.37lbs*$1.20/lb (Al) = $2536.05
Balance between material and maintenance
cost
References
Aluminum Price
http://www.purchasing.com/article/CA6395531.ht
ml
ME 414 Course Notes
Questions