Wind Energy Basics The Kidwind Project www.kidwind.org What is Electricity? Electricity is energy transported by the motion of electrons **We do not make electricity, we CONVERT other energy sources into electrical energy** Conversion is the name of the game KidWind Project | www.kidwind.org Faraday Effect • Faraday Effect • Basic Concepts • Voltage – V – Potential to Move Charge (volts) • Current – I – Charge Movement (amperes or amps) • Resistance – R – V = IxR (R in =ohms) • Power – P = IxV = I2xR (watts) KidWind Project | www.kidwind.org How Does a Generator Work? KidWind Project | www.kidwind.org Electricity! More efficient light bulbs are great, but what is the BEST way to conserve electricity and reduce our consumption of fossil fuels??? • How much would it cost to run this 100 Watt bulb for a full day (24 hrs)? • What about this 25 Watt CFL light bulb, which produces the same amount of light? • 100 Watts x 24 hours = 2400 Watt Hours (2400 Watt Hours = 2.4 Kilowatt Hours) • 25 Watts x 24 hours = 600 Watt Hours (600 Watt Hours = 0.6 Kilowatt Hours) • 2.4 kWh x $0.08/kWh = $0.19 TURN IT OFF!!! • 0.6 kWh x $0.08/kWh = $0.05 Be conscious of your energy choices! Where do we get our electricity? KidWind Project | www.kidwind.org What is a Fossil Fuel??? What is “Renewable Energy?” KidWind Project | www.kidwind.org Types of Electricity Generating Windmills Small (10 kW) Intermediate (10-250 kW) • Homes • Farms • Remote Applications • Village Power • Hybrid Systems • Distributed Power (e.g. water pumping, telecom sites, icemaking) Large (250 kW - 2+MW) • Central Station Wind Farms • Distributed Power KidWind Project | www.kidwind.org Parts of a Wind Turbine KidWind Project | www.kidwind.org Wind Turbine Perspective Workers Blade 112’ long Nacelle 56 tons Tower 3 sections KidWind Project | www.kidwind.org Large Wind Turbines • • • • • • • 450’ base to blade Each blade 112’ Span greater than 747 163+ tons total Foundation 20+ feet deep Rated at 1.5 – 5 megawatt Supply at least 350 homes Yawing – Facing the Wind • Active Yaw (all medium & large turbines produced today, & some small turbines from Europe) – Anemometer on nacelle tells controller which way to point rotor into the wind – Yaw drive turns gears to point rotor into wind • Passive Yaw (Most small turbines) – Wind forces alone direct rotor • Tail vanes • Downwind turbines KidWind Project | www.kidwind.org KidWind Project | www.kidwind.org Importance of Wind Speed • No other factor is more important to the amount of power available in the wind than the speed of the wind • Power is a cubic function of wind speed – VXVXV • 20% increase in wind speed means 73% more power • Doubling wind speed means 8 times more power KidWind Project | www.kidwind.org Calculation of Wind Power •Power inWind the wind Power in the = ½ρAV3 Effect of air density, – Effect of swept area, A – Effect of wind speed, V R Swept Area: A = πR2 Area of the circle swept by the rotor (m2). Carnage! Jobs in the Wind Industry Construction Public Relations/Organizing Support KidWind Project | www.kidwind.org Operations/ Maintenance Maintenance KidWind Project | www.kidwind.org Engineering/ Design Environmental Impact Assessment Wind Power is Fun! KidWind Project | www.kidwind.org Questions??? The KidWind Project www.kidwind.org

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