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Dr. Jeff Salee Dr. Scott Frazier Dr. Shannon FerrellDepartment of Agricultural Education, Department of Biosystems Department of Agricultural
Communication, and Leadership and Agricultural Engineering Economics
The Power of WindHelping 4-H’ers Understand Wind Power in Oklahoma
April 23, 2009
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Source: http://www.greenspec.co.uk/html/energy/windturbines.html
Location, location, location
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Location, location, location
Source: Paul Gipe, Wind Energy Basics (Chelsea Green Publishing Co., 1999)
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The Power of Wind Curriculum
• How can we think like an engineer?
• How do we study the wind?
• How do we use the wind?
• How do geography and community
influence wind power projects?
• How does wind inspire creativity and
design?
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How Do Geography and
Community Influence Wind
Power Projects?
[The Oklahoma Version]
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So why is it so windy in the southern Great Plains?
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But what about Oklahoma specifically?
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A Map of Oklahoma’s Wind Resources
•B
•C
• •A
D, E, F
Current Wind Farms
A – Oklahoma (Woodward)
B – Blue Canyon (Lawton)
C – Weatherford
D – Centennial (Fort Supply)
E – Sleeping Bear (Fort Supply)
Source: Oklahoma Wind Power Initiative
•G
F – Buffalo Bear (Ft. Supply / Buffalo)
G – Red Hills (Hammon)
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Top 10 States by
Installed Wind Energy Capacity
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States with Renewable Portfolio StandardsSource: US Department of Energy, Office of Energy Efficiency and Renewable Energy
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Oklahoma’s Installed Utility-Scale
Wind Power Capacity
Source: Oklahoma Wind Power Initiative
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W hat concerns do communities have about wind power?
Image courtesy Brian Hobbs, WFEC
Image from Google Earth
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What concerns do communities have about wind power?
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What concerns do communities have about wind power?
Image courtesy Brian Hobbs, WFEC
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What concerns do communities have about wind power?
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How Do We Study The Wind?
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How do we study the wind?
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Measuring Oklahoma’s wind
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How Do We Think Like an Engineer?
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Power is a function of air density, swept area, and wind speed
• Doubling rotor length gets
us 22 = four times the
swept area and thus four
times the power
• Since power increases as
a cubic function of
velocity, we see 23 =
eight times the power.
23
2
1rvP
Source: http://www.windpower.org/en/tour/wres/enerwind.htm,
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Source: Paul Gipe, Wind Energy Basics (Chelsea Green Publishing Co., 1999)
A sense of turbine scale
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How big is a wind turbine?
Hub Weight: 35,000 lbs (17.5 tons, 2 1/3 elephants)
Blade Length: 113 feet (wingspan of a 747 jet)
Blade Weight: 17,500 lbs (8.75 tons, 1.1 elephants)
Total Rotor Weight: 87,500 lbs (43.75 tons, 5 2/3 elephants)
COURTESY: OMPA
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60 TON NACELLE(about the size ofa small school bus)
COURTESY: OMPA
How big is a wind turbine?
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THE TOP SECTION
WEIGHS 24.5 TONS
COURTESY: OMPA
How big is a wind turbine?
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COURTESY: OMPA
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An example from Woodward/Freedom
∼1 mile
Average ∼800 ft.Between turbine
Source: Image and measurements from Google Earth, http://earth.google.com
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Spacing Out:The spatial impacts of projects
• American Wind
Energy Association
estimates total area
of ≈ 60 acres/MW of
capacity.
• ≈ 3 acres (5%) to
actual physical
occupation of land.
• ≈57 acres (97%) to
exclusion area for
windflow
preservation.
¼ section (160 acres)
Image from Google Earth