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Wind-Aid

Wind-Aid. Critical Design Review 4/24/2008. Andy Crutchfield James Gates Keri Macaulay David Rupp. John Wloch. Problem Statement Design a compact, portable and robust wind energy system to extract wind energy and convert it to storable, electric energy.

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Wind-Aid

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  1. Wind-Aid Critical Design Review 4/24/2008 Andy Crutchfield James Gates Keri Macaulay David Rupp John Wloch

  2. Problem Statement • Design a compact, portable and robust wind energy system to extract wind energy and convert it to storable, electric energy. • Able to extract enough energy from a wind that is nominally 15 mph (wind speed can vary over a 24 hr. period from 0 to 30 mph). • Power an emergency communication system with a 20 watt load at 12 volts DC continuous performance requirement. Wind-Aid

  3. Customers People in emergency situation (primary) Relief organizations Competition Wind-Aid FEMA Red Cross

  4. Key Features Portability Compact Weight requirement Ease of assembly Number of people Tools to assemble Energy storage capabilities Regulator Batteries Safety brake Continuous power Batteries Tail Design Requirements Wind-Aid

  5. Decision • Horizontal axis turbine • Operates well at high speeds • More documentation and analysis • “Box” base • House all of the components • Could add more weight if necessary • Three lift-type blades • Stability issues with fewer blades • Least amount without problems • Lift blades are more efficient in higher • wind speeds • Telescoping pole • Portability • Compact Wind-Aid

  6. Wind-Aid Final Product Prototype

  7. Wind Turbine Base Estimate drag force generated on blades (CD = 1): F= 10.3 lbs @ 30 mph Wind-Aid Filling base halfway with material : Achieve 53 lbs with poplar wood or 375 lbs with dense stone Trade Studies

  8. Wind Turbine Tower Wind-Aid Estimate tower stresses: Maximum stress is 19 MPa. I = Tower material: Yield strength Density Al 2014 97 MPa 2800 kg/m^3 Steel 350 MPa 7850 kg/m^3 Trade Studies

  9. Wind Turbine Generator Wind-Aid Shaft speed is proportional to voltage output. Trade Studies

  10. Wind Turbine Blades Wind-Aid FX63-137 28 inch twisted airfoil carbon fiber epoxy blades designed Wind speed = 12 mph Trade Studies

  11. Wind-Aid Prototype - Base • Folding Design • All Components Fit Inside • Material - Wood

  12. Wind-Aid Prototype - Tower • Coupling Design • Material – Aluminum • Wires Through Center

  13. Wind-Aid Prototype – Nacelle • Sleeve Bearing • Generator Bracket • Hub Connector • Tail Brackets

  14. Wind-Aid Prototype – Blades • Purchased Blades • Sandwiching Hub • Bolts to Connector

  15. Wind-Aid Prototype – Tail • Efficient Tail Design • Mounts 16” Out • 1 ft2

  16. Wind-Aid Prototype – Electronics Box • LCD Display • Light Mount • Compact, Simple Design

  17. Wiring Schematic Wind-Aid

  18. Prototype Results • Key Results: • Prototype operated as desired! • Achieved 20 W at 12 V for ≈ 12-12.5 mph wind. • Embedded intelligence • Tachometer • Voltage & Current Displays • Load switching abilities • Passive control to point into wind • Electric brake for safety Wind-Aid

  19. Performance Rubric and Results (Grade = 94/100 A-) Wind-Aid

  20. Wind-Aid Specific Results

  21. Socket wrench 7/16” socket, 15 mm socket Crescent wrench Specific Results Wind-Aid

  22. Overall Efficiency of Prototype • Power Equation: • Theoretical: P = ½ ρ A V3 (where A is the total windswept area) • Actual : P = ½ ρ A V3 Cp Ng (Cp = performance coefficient ≈ 0.35 for good design, .596 is max) (Ng = generator efficiency ≈ 0.5 – 0.8) Wind-Aid

  23. From Prototype to Product Wind-Aid • The prototype demonstrates key features of product • Portability • Short setup time • Functionality • Safety • Recommendations for the final product • Base improvements • Tower height • Nacelle and Tail construction • Blades and Hub • Electronics

  24. Wind-Aid From Prototype to Product • Base • Lighter durable material • Foam and clips for storage spots • Carrying straps • Tower • Three sections instead of two • Weatherproof • Nacelle and Tail • Lighter durable materials • Waterproof • Handholds in molded nacelle • Blades and Hub • Longer blades • Streamlined hub; clamps on

  25. From Prototype to Product Wind-Aid • Electronics improvements • Collect all wires as one cable • Rotating plug in nacelle • Weatherproof box • Integrate all electronics into box • Pulse width modulation for brake • Generator • Build a generator dedicated to blade design • Broader performance range • Reduced weight • Increased blade effectiveness • Increased effiency

  26. Summary of Success Wind-Aid • Recommendations indicate prototype success • Prototype met or surpassed expectations • Portable (50lbs) • Easy to setup (<45min untrained) • Produced sufficient power (more than the essential 20W in 12 mph winds) • Efficient braking system

  27. Thank you Wind-Aid We wish to thank Dr. Nelson for his advice on wind turbine overall design and especially blade design. We also wish to thank Drs. Batill and Stanisic for their input and critiques of our design process. We also thank Dr. Schaefer for his help with the electronics. Special thanks go to Mr. Brownell for his patience and extensive advice and help on the electronics side of the design. Special thanks also to Mr. Hluchota in the machine shop for his manufacture of the hub connection for the generator. We also thank the Theater Department for material donations and use of facilities.

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