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Robert Simon, Coleman Hostetler, Aashay Sukhthankar , Devin Moore

Harris Design Project. Robert Simon, Coleman Hostetler, Aashay Sukhthankar , Devin Moore. Project Description. Harris wants users to be able to operate their devices and charge their batteries without the use of “prime” (AC or vehicle) power.

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Robert Simon, Coleman Hostetler, Aashay Sukhthankar , Devin Moore

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  1. Harris Design Project Robert Simon, Coleman Hostetler, AashaySukhthankar, Devin Moore

  2. Project Description • Harris wants users to be able to operate their devices and charge their batteries without the use of “prime” (AC or vehicle) power. • Design Statement: Design a charger system for mobile devices that operates from sources other than standard wall or vehicle power. It must meet the following specifications and guidelines: • It must successfully address the use case that you have identified. Constraints such as weight, size, cost, ease of use, ruggedness, etc., will depend on the identified use case. • It must use two different sources of “alternative energy”.

  3. Project Description cont. • In addition to the objectives in the previous slide the design should address the following specific issues which are important to our users: • Safety: Identify potential safety issues and describe how these issues are addressed • Economic viability: Describe overall system economics and compare to other possible solutions for the use case, i.e., a consumer may not be willing to spend as much for the convenience, but a first-responder may to ensure connectivity • Environmental impact: Describe the pros and cons of your system’s environmental impact

  4. Use Case • Researcher in open terrain • Will most likely have a computer, cell phone, and possibly some other devices • Researcher will most likely encounter bad weather • Rain, snow, wind, etc… • Will most likely be stationary for most of the time, and will not be required to move equipment

  5. Customer Needs Analysis • A reliable charging device • Does not function on battery or “prime” power • Must be portable, cost efficient, and practical • Needs two different sources of alternative energy

  6. Target Specifications • Durability • Must be able to withstand harsh weather conditions • Cost Effective • Must be within a reasonable price range • Efficiency • Must generate adequate energy throughout the day • Usability • Must be simple enough to be used by one person • Safety • Must not cause danger to the environment it is in • (flames near trees, moving parts near people)

  7. Concept Generation/Benchmarking • Hand Cranked: • Similar to Stirling Engine (same spinning motion) • Lower rpm/electricity generated • good for sitting around/downtime • Stirling Engine: • Stationary generator • Can be left at campsite and will generate power until flame runs out • Up to 2500 rpm for a smaller sized engine • Large power supply • Convenient for a stationary campsite • Requires little work to maintain • Wind: • Set up small turbine at campsite for energy • Possibly no wind • Bulky

  8. Conc. Generation/Benchmarking Cont. • Solar: • We could put the solar panels on the tents and leave them out during the day • Run power to any equipment in use • 180 watts/meter squared • Negative if no sun/under shaded areas… • Linear Induction: • Take along when going on long walks • Shake while walking with hands • Negative is that shaking while walking is not very effective • Not enough speed… • Linear induction needs speed to be efficient

  9. Conc. Generation/Benchmarking Cont. • Cost of current solutions: • Solar panels -- $200-$400 • Gas Powered Generator -- $500 • Cost of our proposed solution: • Solar Panels – same • Stirling Engine -- <$100 (~$40)

  10. Selection Matrices

  11. Energy Conversion • Solar Method: • Energy conversion is required from solar to electric • Transducer used for this conversion • Stirling Engine Method • Energy conversion is required from mechanical to electric • DC Generator used to change energy types

  12. Pertinent Information • Will consist of two separate devices • Panels on tent • Stirling Engine on ground/table • Size • Solar Panels (10 ft2) • Stirling Engine (2 cubic feet)

  13. Safety/Environmental Impact • Both systems will be very safety • Solar panels are commonly used • Will have the same setup • Stirling Engine captures the change of air pressures • Environmental Impact • Stirling Engine • Depending on the heat source, carbon dioxide from burning could be released into the atmosphere

  14. Block Diagram (Solar Version) Output to power all other devices from batteries Charger (12 volt battery) 12 volt battery Solar Panels

  15. Block Diagram- (Stirling Engine Version) Stirling Engine AC-DC Inverter Charger (12 volt Battery) 12 volt battery Output to power all other devices from batteries

  16. Conclusion • Combination of Stirling Engine and Solar Panels creates a solution • Does not use batteries • Does not use “prime” power

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