The Electric Boat Challenge: Is Solar Power Better than Gasoline Power

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Presentation transcript:

The Electric Boat Challenge: Is Solar Power Better than Gasoline Power The Electric Boat Challenge: Is Solar Power Better than Gasoline Power? Or does H2 Work Best? Dr. Andrew Zborowski, Ph.D. and Frank R. Leslie, BSEE, MS Space Technology 1/14/2005

1. Abstract Identical trolling motors Similar hulls Identical batteries Differing energy sources What is to be demonstrated? Abstract Solar Gasoline What speeds and distances result from solar & gasoline, etc. sources?

2. Hull Forces Drag force is proportional to speed squared Drag force is balanced by motor force resulting in equilibrium speed Different hull shapes result in different maximum speeds Hull Forces Fh = k • S2 Fm = Fh Fm Fh Moving this way --> Speed limited by forces

3. Motor Thrust Measure thrust force with “open water” around prop (bollard test) Plot relationships Compare motors Specification of 30 pounds thrust Motor Thrust Fm Load Resistance Force, Current Voltage What is “best” load?

4. Travel Energy Energy = Power • time E = P • t Define race end Define time & distance V = d/t Travel Energy Distance, d What energy is required?

5. Energy Storage Battery depletion rate Are batteries truly identical? Full charge at 12.80 volts (TBR; to be reviewed) Discharge load of motor affects available ampere-hours Stop at 10.5V to preserve battery life Energy Storage = ? 10.5 V Voltage, E Time, t Trade power vs. energy

6a. Energy Sources Internal Combustion Engine (ICE) burning gasoline and oil mix charges battery Requires fuel Solar Panel charges battery Requires sun Energy Sources Gasoline ICE Gasoline Crude oil Solar or PV What else to use?

6b. Energy Sources Fuel Cell Leslie’s Pedal Cycle Energy Sources Hydrogen & air in Water & Electricity out ~12Vdc; 1000 watts Leslie’s Pedal Cycle Requires food in Biomass to mechanical to electrical energy 14 volts @ 6 amps charges battery Energy Sources 12Vdc Hydrogen Fuel Cell Fuel Cell Hydrogen Pedal Cycle Which to use?

Perhaps a little slower 7. Race Conditions Ready to race? Good weather Calm water Wind below 4 knots Batteries charged Known weight Straight, sheltered course Side-by-side start End defined by battery voltage less than 10.5 volts per digital multimeter or H2 tank empty Race Conditions Perhaps a little slower

8. Potential Conclusions and Findings Match results against theory Explain discrepancies Data analysis shows that . . . ? Recommendations for the following classes --- “Lessons Learned” Create report and present results Potential Conclusions and Findings What’s next?