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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. Faraday Effect

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## Wind Energy Basics

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**Wind EnergyBasics**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**• 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) Faraday Effect 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??? TURN IT OFF!!! Be conscious of your energy choices! • What about this 25 Watt CFL light bulb, which produces the same amount of light? • How much would it cost to run this 100 Watt bulb for a full day (24 hrs)? • 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 • 0.6 kWh x $0.08/kWh = $0.05**Where do we get our electricity?**KidWind Project | www.kidwind.org**Types of Electricity Generating Windmills**• Small (10 kW) • Homes • Farms • Remote Applications • (e.g. water pumping, telecom sites, icemaking) • Intermediate • (10-250 kW) • Village Power • Hybrid Systems • Distributed Power • Large (250 kW - 2+MW) • Central Station Wind Farms • Distributed Power KidWind Project | www.kidwind.org**Workers**Blade 112’ long Nacelle 56 tons Tower 3 sections Wind Turbine Perspective 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**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 • V X V X V • 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 in the wind Effect of air density, • Effect of swept area, A • Effect of wind speed, V Power in the Wind = ½ρAV3 R Swept Area: A = πR2 Area of the circle swept by the rotor (m2).**Public Relations/Organizing Support**KidWind Project | www.kidwind.org**Maintenance**KidWind Project | www.kidwind.org

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