Project 2: Heat Exchanger Design

1
Project 2 Heat Exchanger Design

• Group Members
• Brian Schludecker
• Phillip Palmer
• Adam Spindler
• Mike Hay
• Joe McGuire

Presented 12/12/2006 to Dr. Toksoy and ME 414
Class, IUPUI
2
Project Summary

• Design and optimization of heat exchanger
• Specifications objectives
• Methods
• Results
• Conclusions

3
Heat Exchanger Specifications

• Heat exchanger length must not exceed 7 m
• Shell diameter must not exceed 2 m
• Shell mass flow rate 120,000 kg/hr
• Water in shell must cool from 40 C to 25 C
• Water in tube enters at 20 C
• Ignore fouling

4
Objectives

• Maximize Q
• Minimize Weight (cost)
• Minimize heat exchanger pressure drop

5
Design Strategy

• Configure MATLAB files to analyze the heat
  exchanger
• Modify input factors until heat transfer ratio is
  close to 1
• Run DOE in MATLAB and Minitab to calculate
  optimal values for system

6
Design Factors

• Tube outer diameter
• Shell inner diameter
• Tube length
• Number of tube passes
• Material
• Pitch
• Number of Baffles
• Baffle Spacing

7
Design Factors for DOE

• Tube outer diameter
• Shell inner diameter
• Tube length
• Number of tube passes
• Material
• Pitch
• Number of Baffles
• Baffle Spacing

8
Design Decisions

• Pitch 1.25 Tube outer diameter
• 0 baffles

9
Interaction Main Effects Plots(to find
Critical Factors)
10
Interaction Main Effects Plots(to find
Critical Factors)
11
Mean Effects Plots
12
Pareto Charts
13
Design Decisions

• Critical factors Length, Shell ID, Tube OD
• Material Aluminum (cost, weight)
• 1 pass

14
Optimized Results
Using guesses (from Matlab)
/- 20 ?
Optimized results are not standard Size ID and
OD, choose close sizes
15
Optimized Specifications

• Tube OD 0.0127 mm
• Shell ID 0.5906 m
• Length 3.3682 m

16
Final Results

• Q maximized 2.099E6 W
• dP in shell minimized 463 Pa
• dP in tube minimized 1500 Pa
• Weight minimized 1108 kg

17
Conclusions

• Minitab optimized values for ID and OD are not
  standard tube/shell sizes, need to adjust Minitab
  results
• Objectives achieved
• Further analysis possible for multiple
  passes/baffles
• Questions?