What is wind power? Wind power is the conversion of wind energy
into a useful form of energy, such as using wind turbines to make
electrical power, windmills for mechanical power and so on.
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Basic info
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History of Wind Power
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Now...
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Energy transformation 1. Solar energy heating Earth 2. Kinetic
energy of air 3. kinetic energy of turbine 4. Electrical
energy
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Wind Generator
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How does wind generator work?
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Efficiency of Wind Power
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Power by wind generator
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Limitation of wind power formula Wind power formula is an
estimate because... a)Not all KE of wind is transformed into
mechanical energy b)Wind speed varies over course of year c)Density
of air varies with temperature d)Wind not always directed at 900 to
blades
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Sample problems A wind turbine has a rotor diameter of 20 m and
the speed of the wind is 25 m/s on a day when the air density is
1.3 kg/m3. Calculate the power that could be produced if the
turbine is 30% efficient.
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Answer A wind turbine has a rotor diameter of 20 m and the
speed of the wind is 25 m/s on a day when the air density is 1.3
kg/m3. Calculate the power that could be produced if the turbine is
30% efficient.
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Maximum amount of power It is impossible to extract this
maximum amount of power from the air because of... a)Speed of
air... b)Frictional losses...
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Advantages of Wind Power 1.Renewable source of energy 2.Source
of energy is free 3.No global warming effect no CO2 emissions 4.No
harmful waste products
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Disadvantages of Wind Power 1. Large land area needed to
collect energy since many turbines are needed 2. Unreliable since
output depends on wind speed 3. Site is noisy and may be considered
unsightly 4. Expensive to construct
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ONE QUESTION...
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Why are turbines not placed near one another? a) Less KE
available for next turbine b) Turbulence reduces efficiency of next
turbine