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Heat Exchanger Design

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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

- 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

# 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)

- 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.

7 Factor Analysis for DP_Tube

Minitab solved for a local solution.

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

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

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

- 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