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Design of an Automobile Cabin Ventilation System

ME 414: Thermal Fluid System Design Mechanical Engineering, IUPUI Professor: Dr. Toksoy Fall 2006. Design of an Automobile Cabin Ventilation System. Krista Cowan John Fearncombe Nathaniel Greene Brad Holtsclaw Katie Iaizzo. Design Parameters.

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Design of an Automobile Cabin Ventilation System

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  1. ME 414: Thermal Fluid System Design Mechanical Engineering, IUPUIProfessor: Dr. ToksoyFall 2006 Design of an Automobile Cabin Ventilation System Krista Cowan John Fearncombe Nathaniel Greene Brad Holtsclaw Katie Iaizzo

  2. Design Parameters • Satisfy space constraints dictated by other system components • Minimize pressure drops in each of the three sections of the system • Equalize these pressure drops • Minimize cost of the system

  3. System Modeling • Flow evaluation performed within AFT Fathom software based upon geometry constraints • Evaluated potential materials based on price, density, and cost • Utilized fluid properties dictated by the given fluid and operating temperature

  4. Summary Table

  5. Analysis Tools • AFT Fathom for flow distribution and flow rate analysis • Microsoft Excel orifice diameter analysis

  6. Design Parameters • 3D Pipes with 1D Analysis • Create 3 separate models with constant pressure • No Elevation • Define cross-sectional area • No pump • Verify reasonable flow rate and velocity • K=3.42 at system vents

  7. Initial Model

  8. Design Process • Optimized bend dimensions to reduce pressure losses • Selected an appropriate orifice diameter • Experimented with sudden vs. conical contractions • Experimented with venturi

  9. Selection of Orifice Diameter

  10. Bill of Materials

  11. Final Model

  12. Conclusion • Total Material Costs= $12.43 • Equalized flow distribution • Equalized pressure drops • Side Branches= 0.01265 Pa • Center Branch= 0.01259 Pa • Difference= 0.49% • Minimized weight

  13. Sources • Class Notes and Handouts • Idelchik, I.E. (1989). Flow Resistance: A Design Guide for Engineering • www.mcmaster.com

  14. Questions

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