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Power Generation for the Better Water Maker: Subsystems Design Review October 29, 2013

Power Generation for the Better Water Maker: Subsystems Design Review October 29, 2013. Agenda . Concept Selection Treadle Bike Subsystems Engineering Requirements Proof of Concept Budget/Cost Analysis Project Plan to DDR. Problem Statement.

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Power Generation for the Better Water Maker: Subsystems Design Review October 29, 2013

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  1. Power Generation for the Better Water Maker: Subsystems Design Review October 29, 2013

  2. Agenda • Concept Selection • Treadle • Bike • Subsystems • Engineering Requirements • Proof of Concept • Budget/Cost Analysis • Project Plan to DDR

  3. Problem Statement The Better Water Maker was developed to disinfect water in nations with high mortality rates due to poor water and sanitation systems. The goal of our team is to provide a low cost, efficient power generation system for the Better Water Maker that does not tire the user, while it is fun and easy to use.

  4. Concept Selection • The original selection was too much like re-inventing the wheel • From there, we toyed with a mechanical treadle design • Finally, we worked back towards a more reasonable design

  5. Treadle Pump • Used in developing world for irrigation • Piston-Cylinder System • Difficult to translate into power

  6. Mechanical Treadle Arc Trainer Treadle Lathe Treadle Sewing Machine

  7. Our Design: Treadle After careful consideration, we decided to move back to the bike design.

  8. Subsystems • Seating • Power Train • Electronics • User Interface • Sanitation System Interface • Structural Components • Manuals • Testing • Risk Analysis

  9. Engineering Requirements

  10. Proof of Concept “Historically, two treadles were used for some tasks, but even then the maximum output would have been quite small, perhaps only 0-15 percent of what an individual using pedal operated cranks can produce under optimum conditions.” (Wilson, “Understanding Pedal Power”, 1986)

  11. Proof of Concept • “A person can generate four times more power (1/4 horsepower [hp]) by pedaling than by hand-cranking.” • “Pedal power enables a person to drive devices at the same rate as that achieved by hand-cranking, but with far less effort and fatigue.” • Test Plan - run motor with a second motor to determine required torque • Our power requirement = 23 to 29 Watts (Wilson, 1986)

  12. Schematic *P13417 Design ergonomic recumbent seat, potentially adjustable potentially wooden gearbox versus plastic 4 gears and 1 sprocket inside of gearbox 1-4 motors will re-evaluate effectiveness

  13. Block Diagram

  14. Mechanical Analysis • RPM output of 7424 • Max torque value of 3.7 lbf-ft • Low stress on shaft *Calculations made using Shigley’s Design of Machine Elements

  15. Electrical Details of Pump and Bulb • 12V nominal system • Operates closer to 14V • Voltage is limited to 14.3V in current design • Pump turns on after ~10s, bulb draws power immediately • Controlled using a capacitor • Resistance of system with pump off = ~9.3Ω • Resistance of system with pump on = ~7.17Ω

  16. Electrical Systems in the Generator • DC Motors • Possibility of using from 1 to 4 DC motors • Regulator Circuitry • Limits voltage to a max value • Current design limits voltage to 14.3V • We would like this raised to 15V • LED user interface • Display information to the user

  17. Regulator Circuit • Would like to make use of Team 13417’s design • Limits voltage at 15V • 1 inductor • 5 capacitors • 10uF to 100uF • 3 diodes • 4 ICs • 2 switching regulators, 2 amplifiers

  18. Selection of DC Motors • Run tests at different RPM • Develop a voltage to RPMratio for each motor or set of motors • Need to generate 15V under load at a reasonable RPM • Once a motor configuration is selected, the gear ratios in the gearbox can be finalized • Gear ratio is based on 50-60 RPMuser input

  19. Risk Assessment: Design

  20. Risk Assessment: Ergonomics

  21. Risk Assessment: Project Planning & Shipping

  22. Risk Curve • Add risks as they arise • Review and adjust risks on Fridays • Superimpose lines to stay on track • Current value = 105

  23. Feasibility • Parts are readily available • Standardized sizes • Design aspects are fundamental • High RPM, high efficiency

  24. Test Plan ER2: Generated Power ER4: Training Time ER5: Ease of Repair ER6: Effort Required ER8 and ER9: Number of Installers and Tools

  25. Bill of Materials (BOM)

  26. BOM for Power Generation System

  27. BOM for User Interface

  28. Budget

  29. Yellow=Variable Pricing Orange=Worst Case Pricing Cost Analysis • This is not an actual cost estimate, preliminary cost estimate. • Many of the component’s manufacturers have not responded or have not been contacted.

  30. Project Plan • List of tasks that will be completed before the Detailed Design Review • An action item log is also maintained to delegate more specific tasks

  31. Project Plan

  32. Manuals • Template is prepared • Pictures are the main ingredient • User Manual will contain: • The Use Of the BWM • Setting Up the BWM • Properly Using the BWM • Maintainng the BWM • Troubleshooting and Repairing the BWM • Parts and Tools • Contact Information

  33. Questions?

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