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Heat Exchanger Design. ME 414- Fluid Systems Design Professor: John Toksoy Spring 2009 team Tyler Laughlin Denis Shkurapet Ethan Sneed Matt Tolentino Tyler Turk. Objective. To design a heat exchanger than meets the following criteria: Cools liquid from 45 C to 25 C

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Heat exchanger design

Heat Exchanger Design

ME 414- Fluid Systems Design

Professor: John Toksoy

Spring 2009

team

Tyler Laughlin

Denis Shkurapet

Ethan Sneed

Matt Tolentino

Tyler Turk


Objective
Objective

  • To design a heat exchanger than meets the following criteria:

    • Cools liquid from 45 C to 25 C

    • Must be less than 7 meters in length

    • Shell diameter is less than 2 meters

    • Minimize weight of the tube and shell

    • Minimize pressure drop

    • Heat transfer ratio of 1


Design parameters
Design Parameters

# of tubes passed

Tube outer diameter

Tube inner diameter

Material

Baffles

Shell thickness

Shell Material

Strength factors

Fluid allocation

Type of flow (parallel or counter)


Analysis
Analysis

  • Use Minitab and Matlab

  • Minitab

    • Use to obtain the main effects plots, Pareto charts, and the response optimizer.

  • Matlab

    • Use to run analysis of the DOE files and to give us the outputs of total weight, calculated heat transfer, cost, and pressure drops.

    • DOE allows us to determine the most important variables in this design.






Analysis pareto charts 1 st doe
Analysis: Pareto Charts 1st DOE

7 Factor Analysis for DP_Tube


Analysis 1 st optimization
Analysis: 1st Optimization

Minitab solved for a local solution.

The starting values were changed multiple times until Minitab found a new, more optimal solution.



Analysis 2 nd optimization
Analysis: 2nd Optimization

Starting values of the optimization were varied with no improvement in performance.


Conclusions damn near perfect
Conclusions: Damn near perfect!

Heat Transfer Coeff : 876.97 W/m2.C

R-value: 0.98

Number of tubes: 1313

Shell Pressure Loss: 335.11 Pa

Tube Pressure Loss: 29832.58 Pa

Weight of Heat Exchanger: 350.88 kg


Conclusions recommendations
Conclusions: Recommendations

  • Could be further optimized if Tube Thickness was decreased

  • Resulting in:

    • Lower weight - decrease of 51.93 kg

    • Lower Tube pressure loss - decrease of 6703.1 Pa

    • No significant loss of R-value

  • A smaller tube is not commercially available

  • Possibly achieve greater performance at a greater price



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