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Wind Power
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Wind Patterns Global winds Sea and land
breezes Valley winds
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Global Wind
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Sea, land, and valley winds
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Wind Rose Direction Speed Frequency
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Equations
Wind power increases as the square of diameter, but cube of wind speed
(W)power is P (m/s) speed windis V
(m)diameter rotor is d
3kg/m 1density air is
disk blade of area anddensity with increases m (kg) blades through going streamair of mass is m
328
221
VdP
VmE
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Scaling (Example) A wind turbine (d=3m) generates 10
kW of power at wind speed of 4 m/s.How much power will it produce If the turbine diameter were increased to 6 m? If wind speed suddenly increased to 12 m/s? With the same wind conditions, would turbine
produce more power in winter or summer?
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Wind Turbine Principle of operation
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Design Considerations Rotor Size Number of blades Gearbox Generator Controls
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Advantages and Disadvantages
Advantages• Clean• Renewable
Disadvantages• Intermittent• Wind speed not too slow, not too fast• Noise• Aesthetic• Dangers to birds
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Siting Wide areas with open
views in all direction Valleys and ridges Close to power grid Away from towns and
population centers
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Future