wind mills
TRANSCRIPT
ELECTRICITY GENRATION THROUGH WIND MILLS
Presented by-SHAKIL MUHAMMAD
UET PESHAWARPAKISTAN
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
Basic ConceptsVoltage V – Potential to Move Charge (volts) Current I – Charge Movement (amperes or amps) Resistance R = V/I(R in =ohms) Power – P = I*V= I2xR (watts)
How Does a Generator Work?
Electricity!
• 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)
• What about this 25 Watt CFL light bulb, which produces the same amount of light?
• 25 Watts x 24 hours = 600 Watt Hours (600 Watt Hours = 0.6 Kilowatt Hours)
More efficient light bulbs are great, but what is the BEST way to conserve electricity and reduce our consumption of fossil fuels???
Where do we get our electricity?
What is “Renewable Energy”?
Types of Electricity Generating Windmills
Small (≤10 kW)• Homes• Farms• Remote Applications (e.g. water pumping,
telecom sites, icemaking)
Large (250 kW - 2+MW)• Central Station Wind Farms• Distributed Power
Intermediate (10-250 kW)• Village Power• Hybrid Systems• Distributed Power
Wind Turbine COMPONENT
Wind Turbine Perspective
Nacelle56 tons
Tower3 sections
WorkersBlade
112’ long
Large Wind Turbines450’ base to bladeEach blade 112’Span greater than 747163+ tons totalFoundation 20+ feet
deepRated at 1.5 – 5 megawattSupply at least 350
homes
Yawing – Facing the WindYawing – 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 rotorTail vanesDownwind turbines
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 speedV X V X V
20% increase in wind speed means 73% more power
Doubling wind speed means 8 times more power
Calculation of Wind Power
•Power in the wind Effect of air density, ρEffect of swept area, AEffect of wind speed, V
R
Swept Area: A = πR2 Area of the circle swept by the rotor (m2).
Power in the Wind = ½ρAV3
Environmental Impact Assessment
THANKS FOR TIME