Energy with Kites Harnessing Wind Final Progress Report: … · Energy with Kites Julia Dworetzky,...
Transcript of Energy with Kites Harnessing Wind Final Progress Report: … · Energy with Kites Julia Dworetzky,...
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Concept Review: Harnessing Wind Energy with Kites
Julia Dworetzky, Uriel Salazar, Rebecca Schmitt, Meredith Short, Trevyn Toone,
Chris Van BurenJanuary 28, 2019
Final Progress Report:Harnessing Wind Energy
with KitesJulia Dworetzky, Uriel Salazar, Rebecca Schmitt, Meredith Short, Trevyn Toone, Chris Van Buren
April 22, 2019
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Motivations
● Renewable resource● Coastal disaster relief● Energy access● Affordability
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BIG CONCEPT5
+ =
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Sample Calculation: Energy
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● Wind is perpendicular to the plane of the kite arm● Kite area is roughly 1.5 m wide by 1 m tall● Coefficient of drag: 1.28 (from NASA)● Around a storm event, wind speed can be ~ 10 m/s● Tip-Speed Ratio is 1
586.32 Watts
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Sample Calculation: Energy
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● Sanity Check: Use Betz’s Limit● Kite is roughly 54% efficient!
1085.78 Watts
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Prototype Analysis: Fan and Pump Laws
Wind tunnel analysis with 3D printed models Power laws and scaling factors for comparison
Models must have an equal flow coefficient
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Test ProcedureChange wind speed and resistance valuesDiameter (by model)Angular velocity (from laser tachometer)Power (by extrapolating motor data)
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Test Results
Assumption of Tip-Speed Ratio being 1 is correct (data shows 0.95-1.00 for several tests)Efficiency at varying wind speeds is on average 50-60%.Voltage values change on a smaller scale
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Future Considerations
Stronger wire frame, different shapePockets collapsed and stalled the turbine
Two-Vane systemCould more effectively prevent stalling
Easier way to connect tethersMore concrete base plan
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Environmental Benefit Analysis● Carbon offset● Operating area
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Carbon Offset: Replacing Generatorsassuming model produces average power of 586 W
143g CO2 saved per hour compared to burning gasoline (without ethanol)
146g CO2 saved per hour compared to burning diesel
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Carbon Offset: Broader Electricityassuming model produces average power of 586 W
106g CO2 saved per hour compared to burning natural gas
195g CO2 saved per hour compared to burning coal (lignite)
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88 to 98 percent less operating area per model than an industrial wind turbinecompared to GE 1.5sle, depending on terrain
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Social BenefitsHealth
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Safety
Empowerment
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One kW of wind energy replaces:
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Small room heater
Electricstovetop
Mini-fridge or ice-maker
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What will our target market look like?
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Wind
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Demand
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Demand
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Storm Statistics● Climate change amplifying storms: need for disaster-
mitigation strategies● Hurricane Florence caused an estimated $28.1 million
in residential damages● Duke Energy sent 20,000 employees across the state
to restore power● 670,000 people remained without power 4 days later● Most vulnerable: hard-hit, coastal areas
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Target Market Analysis● Demand: Blackouts caused
by hurricane damage● Solution: Temporary power
supply via wind kite
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Business Plan
Basic Business Plan● Cost of materials and manufacturing● 20 regulations in North Carolina● 18 financial incentives in North Carolina● Revenue from advertising space on kites● Cutting costs
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Project Budget
$551
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Feasibility● Cost of materials● Replacement of kites and
materials● Land use● Generator
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Summary and Final Remarks
Low-cost energy systemNatural disaster relief75% prototype in the makingFeasible design, but not perfect (yet)
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Questions?
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