Robert Simon, Coleman Hostetler, Aashay Sukhthankar, Devin Moore

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: o 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. o It must use two different sources of “alternative energy”.

In addition to the objectives in the previous slide the design should address the following specific issues which are important to our users: o Safety: Identify potential safety issues and describe how these issues are addressed o 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 o Environmental impact: Describe the pros and cons of your system’s environmental impact

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

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

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)

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

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

Cost of current solutions: Solar panels -- $200-$400 Gas Powered Generator -- $500 Cost of our proposed solution: Solar Panels – same Stirling Engine -- <$100 (~$40)

Option Portability (25%) Cost (35%) Safety (5%) Usability (25%) Solar Panels1213 Stirling Engine2131 Wing3322

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

Will consist of two separate devices Panels on tent Stirling Engine on ground/table Size Solar Panels (10 ft 2 ) Stirling Engine (2 cubic feet)

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

Solar Panels Charger (12 volt battery) 12 volt battery Output to power all other devices from batteries

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

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