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## Heat Exchanger Design Project Department of Mechanical Engineering ME 414 Thermal Fluid System Desig

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### Purdue School of Engineering and Technology. Heat Exchanger Design Project ... Design a heat exchanger flowing a chemical at 80,000 kg/hr to drop the fluid ... – PowerPoint PPT presentation

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Title: Heat Exchanger Design Project Department of Mechanical Engineering ME 414 Thermal Fluid System Desig

1
Heat Exchanger Design Project Department of
Mechanical Engineering ME 414 Thermal / Fluid
System Design Final Project December 13,
2005 Group Members David Langenderfer Rishi
Govalakrishnan Dan Langenderfer Vincent
Liaw Professor Mr. John Toksoy
2
Problem Statement
• Design a heat exchanger flowing a chemical at
80,000 kg/hr to drop the fluid temperature from
35C to 25C
• Cooling chemical is city water flowing at 20C
• The shell may not exceed 2 meters in diameter and
7 meters in length
• Weight, pressure drop, and cost should be
minimized

3
Assumptions
• Process and cooling fluid have minimal corrosive
properties
• Properties of fluid are similar to water
• Counter flow to improve effectiveness
• Tube pitch set at 90 degrees
• Pitch ratio of 1.25 (rule of thumb)
• Shell side mass velocity set to 140,000 kg/hr

4
Matlab Implementation
• Initially used to determine possible dimensions
of an acceptable heat exchanger
• Output from Matlab was inputted into Minitab for
optimization
• Compared results from Matlab output and Minitab
optimization

5
Funneling Effect
Tube OD, Shell ID, Length, Number of Passes, Tube
Material, Baffles, Baffle Spacing
7 Factors
3 Factors
Tube OD, Shell ID, Length
6
Optimization
• Obtained results with 7 parameters from Matlab
• Using DOE Factorial Response in Minitab we
reduced the parameters by utilizing Main Effects
plots

7
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8
Determining Effects on Heat Exchanger
• Key variables for an effective heat exchanger
• Tube OD
• Shell ID
• Tube Length

9
Decisions from Main Effects
• Two pass on tube side
• Minimal foot print on shop floor
• Minimize leak points
• Increases pressure drop
• Allows for independent expansion of tubes
• and shell1

10
Decisions Contd
• Counter flow is desirable for a two tube pass
exchanger to increase effective temperature
difference1
• Aluminum minimized weight with no effect on heat
transfer
• No baffles due to large increase in pressure drop
on shell side

11
Optimization Plots
12
Results
• Tube OD 0.0095 m
• Shell ID 0.3874 m
• Length 3.0 m
• Tube velocity 1.54 m/s (Range 0.9 - 2.4 m/s)
• Turbulent flow promoting high heat exchange on
shell and tube
• Heat transfer is 6 over desired heat transfer to
accommodate for future fouling

13
Results (contd)
• ?P Shell 2,513 Pa ( 0.365 PSI)
• ?P Tube 38,450 Pa (5.577 PSI)
• Weight 496 kg (1094 lbs)
• Number of Tubes 750

14
Lessons Learned
• Optimization using interaction between Minitab
and Matlab
• How to work as a team
• Lots of decisions to make when given an open
ended question
• Many solutions to a simple problem
• Finish projects early (12/4/2005)

15
References
• Heat Exchangers Selection, Rating, and
• Thermal Design
• Kakaç and Liu
• CRC Press, 2nd Edition, 2002
• ME 414 Lecture Notes
• Professor John Toksoy, 2005

16
Questions