1. ME 414 – TEAM #1 JENNIFER HACKER JESSE KENDALL CHRISTOPHER ROGERS BRANDON RODRIGUEZ ALEK VANLUCHENE Heat Exchanger Design

2. Problem Statement Design a heat exchanger that cools a corrosive chemical with water properties from 45 C to 25 C with a mass flow rate of 220,000 kg/hr using city water at 22 C with variable mass flow rate.

3. Design Requirements Heat Exchanger Length is less than 7 m Heat Exchanger Diameter is less than 2 m Minimize Pressure Losses in both shell and tube Minimize Weight

4. Variable Reduction Tube & Shell Material – Stainless Steel Tube will carry corrosive material for ease of cleaning Counter flow was selected due to increase efficiency Single pass selected due to lower pressure drop, small cooling requirement, and cost Shell thickness was selected to minimize weight and handle maximum pressure of the heat exchanger.

5. Variable Reduction Cont ….. Center tube diameter was selected to be the same size as other tubes to reduce cost For efficiency and ease of cleaning a square pitch was chosen The pitch angle was chosen to be 90 deg since the angle did not affect the design parameters The MATLAB program chose the number of tubes based on the shell diameter

6. To Baffle or Not? Advantages  Higher Heat Transfer Disadvantages  Higher Pressure Loss  Increased Weight Since the chemical only required a small amount of cooling (20 C) the baffles were not needed for the gain in heat transfer.

7. Main Effect Plots - Q

8. Main Effect Plots – ΔP Tube

9. Main Effect Plots – ΔP Shell

10. Main Effect Plots – Weight

11. Pareto Chart

13. Minitab Optimization

14. End Results Initial ValuesOptimized ValuesUnits Weight40004022kg ΔP Shell3000029930Pa ΔP Tube1500014630Pa Heat Transfer325000032510000W/m^2 Shell Mass Flow Rate 85 Counter Flow or Parallel Counter Number of Tube Passes 1 BafflesNo Shell Inner Diameter0.6858 Shell Thickness0.001 Shell Material Stainless Steel Tube Material Stainless Steel Tube Outer Diameter0.00635 Center Tube Diameter0.00635 Tube Thickness0.000457 Tube Length5.5 Number of Tubes Calculated by MATLAB Tubing PitchSquare Tube Layout Angle90

15. Questions