Design Project 1

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Design Project 1

• Equalized Velocity for Automobile Climate Control

Rodger Stowe Amber Russell Kevin Feeley Kreischer
Davis Tom Filipucci
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Ductwork Layout
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90 Deg Fitting
45Deg Mitered Fittings
Tapered Fitting
Tapered Fitting
Tapered Fitting
Register K3.42
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Fittings
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Ductwork Design

• All Material ABS Plastic
• Investigate changing 45 deg miters to 45 deg
  sweeping elbows
• All materials readily available
• ABS Plastic prices
• 0.76 per foot for tubing
• 1.246 for 90deg bend
• 0.98 for 45deg miter

  QTY PRICE    
Tubing 7.6 0.76 5.80  
90 deg 1 1.25 1.25  
45 deg Miter 6 0.98 5.88  
Tapered fittings 3 2.00 6.00  
         
         
Total Cost per vehicle Total Cost per vehicle Total Cost per vehicle 18.93  
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Output Data

• No significant variance in velocity from vents 1
  and 3
• Variances in vent 2 are offset by increase of
  Volumetric Flow

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Questions?
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Design Project 2Heat Exchanger Design
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Project Background

• Cooling an industrial chemical by 15 oC
• Mass flow rate of chemical is 120,000 kg/hr
• Chemical enters h.e. at 40 oC and exits at 25 oC
• Chemical properties approximated as water
• Coolant used is treated city water at 20 oC
• Mass flow rate of coolant is adjustable

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Design Requirements

• Cool the liquid chemical from 40oC to 25oC
• Heat exchanger length can not exceed 7 m
• Heat exchanger shell diameter can not exceed 2 m
• Minimize heat exchanger shell and tube weight
  hence the cost
• Minimize heat exchanger pressure drop

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Initial Design Decisions

• Chose a parallel over counter-flow design
• Mass flow rate in the shell was becoming
  excessive with counter-flow design
• Internal shell pressure was much higher with
  counter-flow
• These would have added significantly to overall
  weight and cost to avoid

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Design of Experiments

• The seven parameters at the start of the MINITAB
  DOE
• Tube length (4.8 - 7.2 m)
• Tube OD (9.52 - 15.875 mm)
• Shell ID (0.3784 - 0.4890 m)
• Nusselt Number (Dittus-Boelter,
  Petukkov-Kirillov)
• Baffle (Yes, No)
• Baffle Spacing (160 240 mm)
• Mass flow through shell (31.11 45.55 Kg/s)
• Used MINITAB tools to reduce variable design
  parameters to
• Tube length
• Tube OD
• Shell ID

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Final Design Pareto Charts
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Heat Exchanger Performance
q (W) Weight (kg) DPshell (Pa) DPtube (Pa)
2,116,254.91 1,926.73 239,569.26 1,695.03
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H.E. Over-design

• Desired heat transfer rate 2.088 MW
• Calculated heat transfer rate 2.116 MW
• Over-design of 27.3 kW
• Desired to Calculated Ratio 0.99

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H.E. Overdesign Effects of Fouling
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Fouling Images
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Questions?