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

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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
(No Transcript)
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
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