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ME 414 - Thermal Fluid System Designs

ME 414 - Thermal Fluid System Designs. Heat Exchanger Final Project. Problem statement. Parameters of Heat Exchanger Mass flow rate = 220,000 kg/hr Working fluid is treated as water Working fluid enters at 45 ºC Working fluid exits at 25 ºC Design Limits of Heat Exchanger

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ME 414 - Thermal Fluid System Designs

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  1. ME 414 - Thermal Fluid System Designs Heat Exchanger Final Project

  2. Problem statement • Parameters of Heat Exchanger • Mass flow rate = 220,000 kg/hr • Working fluid is treated as water • Working fluid enters at 45 ºC • Working fluid exits at 25 ºC • Design Limits of Heat Exchanger • Cooling fluid is city water • Cooling fluid enters at 20 ºC • Max length is 7 meters • Max shell diameter is 2 meters

  3. Goals of design optimization • Achieve Heat Transfer Requirements • 5.11 MW • Minimize Pressure Drop • This increases the efficiency of the heater exchanger • Direct result is lower energy requirements, which means lower energy costs • Minimize Weight • This is directly proportional to the cost • More material = more money

  4. Funnel effect • Design Requirements • All variables available • Run OFATS • 12 variables • Run DOE 1 and DOE 2 • 6 variables • Run DOE 3 • 4 variables • Optimize • Pareto Charts

  5. Design of Experiment Variables • DOE 1 • Shell Internal Diameter • Tube Outside Diameter • Tube Length • Tube Thickness • Mass Flow Rate of Cooling Fluid • Number of Tube Passes • DOE 2 • Use of Baffles • Baffle Spacing • Baffle Cut • Counter Flow versus Parallel Flow • Shell Material • Tube Material

  6. Results of DOE 1

  7. Results of DOE 2

  8. Remaining Variables • Shell Internal Diameter • Tube Outside Diameter • Tube Length • Tube Thickness • Counter Flow • Shell Material

  9. Results of DOE 3

  10. Pareto Plots

  11. Optimization

  12. Before optimization • Variables • Shell Internal Diameter = 0.5 m • Tube Outside Diameter = 0.003 m • Tube Length = 5.95 m • Tube Thickness = 0.002m • Characteristics • q = 5.11 MW • Weight = 2473 kg • Tube Side Pressure Drop = 3680 Pa • Shell Side Pressure Drop = 2321 Pa

  13. After optimization • Variables • Shell Internal Diameter = 0.52 m • Tube Outside Diameter = 0.035 m • Tube Length = 4.87 m • Tube Thickness = 0.04m • Characteristics • q = 5.11 MW • Weight = 1365 kg • Tube Side Pressure Drop = 163 Pa • Shell Side Pressure Drop = 1344 Pa

  14. Conclusion • Engineers can benefit greatly from optimization. • The combination of Matlab and Minitab can save time and money in design.

  15. questions ?

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