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Wind Power
Wind Patterns Global winds Sea and land
breezes Valley winds
Global Wind
Sea, land, and valley winds
Wind Rose Direction Speed Frequency
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
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?
Wind Turbine Principle of operation
Design Considerations Rotor Size Number of blades Gearbox Generator Controls
Advantages and Disadvantages
Advantages• Clean• Renewable
Disadvantages• Intermittent• Wind speed not too slow, not too fast• Noise• Aesthetic• Dangers to birds
Siting Wide areas with open
views in all direction Valleys and ridges Close to power grid Away from towns and
population centers
Future