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Overview
Resource Information Where it comes from How it works History
Interesting Facts Environmental Impact Advantages / Disadvantages Outputs Resources
Where it Comes From
Converted solar energy Hot air rises Cold air takes place, causing wind Wind turns blades
Useful Vocabulary
Weather / Climate conditions Has to be in windy area Too much wind harms equipment
Wind farm Many turbines grouped together Makes large amounts of energy
Other vocabulary words you should learn are in bold and italics on the slide.
How it Works
Wind pushes blades Blades attached to a hub
together called the rotor Rotor spins drive shaft Gearbox makes shaft faster Drive shaft turns generator to make energy Generator converts mechanical energy to
electrical energy
How it Works Picture
• Hub– Where blades are attached
• Nacelle– Contains drive train,
gearbox and generator
• Roter Blade– Converts wind energy to
rotational shaft energy
• Gear Box– Helps generator spin fast
enough to make electricity
Speed Increases
History
• 3500 B.C.– Egyptians use for sailboats
• 1100 A.D.– Appear in Europe– Used by farmers
• Pump water• Grind grain into flour
• 1888– Charles F. Brush– Electricity
• 1990s– Environmental concerns promote
wind energy• 2007
– US wind energy capacity increases by 45%
Old Dutch Windmill,
Common in Denmark
Interesting Facts
• Weather device tells blades to catch more or less wind
• Denmark manufactures many windmills
• Many in Germany, Denmark, and California
Wind farm on Coast of Denmark
Vertical Vs. Horizontal Axis
• Vertical – “egg-beater”– Axle is vertical
• Horizontal– “propeller”– Axle is horizontal
Advantages
Wind is free Good for pumping
water Reasonable cost Renewable source Good for rural areas
Disadvantages
Need 3x the amount of installed generation to meet demand
Limited to windy areas Can only use small generator size Need many to generate enough energy Need expensive energy storage Climate dependant
Wind can damage equipment Noisy
Four Outputs
Type I No smog Generates energy
Type II Loud Might not always work Looks ugly
Type III People profit from having it on property
Type IV Hurt endangered birds