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Pedal Purification

Pedal Purification. University of Notre Dame Senior Design Group A6 November 28, 2006 Team Rallye (from left): Nicole Del Rey Eric Sabelhaus Mike McConnell Tim Rodts. Objective. 2006 ASME Design Competition requirements:

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Pedal Purification

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  1. Pedal Purification University of Notre Dame Senior Design Group A6 November 28, 2006 Team Rallye (from left): Nicole Del Rey Eric Sabelhaus Mike McConnell Tim Rodts

  2. Objective • 2006 ASME Design Competition requirements: • Allow user to convert 200 mL of ‘polluted’ water into pure drinking water within one hour. • Compact, collapsible, transportable design. • Group Requirements: • Robustness - adaptable as power source for emergency applications. • Collapsible – components housed underneath user’s seat when not in operation.

  3. Pedals and Gears Heating Generator Condensing The Concept

  4. Pedals and Gears Heating Generator Condensing Pedals and Gears • Considerations: • User comfort (height • adjustment with angle-iron) • Sustainable user RPM • Optimum gear configuration

  5. Pedals and Gears Heating Generator Condensing Generator • Considerations: • Sprocket mount to 5/16” • generator shaft • -fitted sleeve and set-screw • Exposed wire • -wire caps • Connection to alternative power • sources • -fitted to female plug • Firm mounting to base • -L-brackets mounted to wood base

  6. Pedals and Gears Heating Generator Condensing Heating and Condensing

  7. Pedals and Gears Heating Generator Condensing Packaging Compact Expanded Packaging

  8. Pedals and Gears Heating Generator Condensing Packaging • Features: • Collapsible chair back • Fold-up angle-iron supports • All components housed underneath chair on stationary base Concept Realization Packaging

  9. FEASIBILITY ISSUES

  10. Feasibility Issue #1: Energy Requirements Question: Can a bicycle pedal system provide enough energy to boil 200 mL water in 1 hour? Erequired = ρcVΔT +mhfg = 523 kJ Pavailable = 150 W Eavailable= (150 W)(3600 s) = 540 kJ Answer: YES – at 100% efficiency!

  11. Feasibility Issue #2: Pressure Reduction Question: Would a pressure reduction system be feasible for energy savings, since water boils at lower temperatures under lower pressures? Erequired = Eheat+Evaporize + Evacuum Emax = 523 kJ Emin = 510 kJ Answer: Energy savings are minimal, hence pressure reduction is infeasible.

  12. Feasibility Issue #3: Maximizing Gear Ratio • Question: How can generator power output be fully utilized? • Generator: maximum 5,000 rpm at GR = 55.7 • Obtained: 460 rpm at GR = 5.13 • Yields ≈ 3.0 W • Result: Need 3 sets of sprockets (ratios shown below) to maximize generator power output. • Deemed infeasible for prototype due to cost issues related to purchasing/mounting sprockets • Answer: For final design, increase gear ratio!

  13. TECHNICAL ISSUES

  14. Technical Issue #1: Generator Shaft/Sprocket Connection • Generator can handle radial load, verified by supplier. • Sprocket with set-screw in hub necessary. • For ANSI Chain #35, minimum ½” bore diameter, generator has 5/16” shaft. • Solution: fashion sleeve in sprocket/hub to match shaft diameter.

  15. Technical Issue #2: Compact Packaging • In disassembled state, all components must be housed underneath chair to meet ASME requirements. • Maximum girth = 165” • Prototype girth = 135” • Solution: CAD model to verify location/ orientation of components. • 21” x 25.5” between chair legs • Condensing unit • Removable Base

  16. Technical Issue #2: Compact Packaging 21” 25.4” 11.8” 20” 11” 6” 28”

  17. Technical Issue #3: Material Selection • Material Requirements: • Lightweight • Strong • Stiff • Durable • σapplied ≈ 3.8 MPa • HDPE chosen • Meets all requirements • σHDPE – UTS ≈ 45 MPa

  18. Use of Prototype Pedaling Demo Sprockets in Motion Voltage Output at 0.2 A Condensing System

  19. CONCLUSIONS

  20. Conclusions • Prototype shows individual feasibility of: • Mechanical energy transfer • Power Generation • Heating unit • Condensing unit • Compact, collapsible and transportable design was achieved. • Prototype proves feasibility while satisfying: • $400.00 budget • Design schedule • Concept Design is feasible with modification to gear ratio.

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