Winds are influenced by the ground surface at altitudes up to 100 meters.
Wind is slowed by the surface roughness and obstacles.
When dealing with wind energy, we are concerned with surface winds.
A wind turbine obtains its power input by converting the force of the wind into a torque (turning force) acting on the rotor blades.
Large Wind Turbines
Able to deliver electricity at lower cost than smaller turbines, because foundation and planning costs are independent of size.
Well-suited for offshore wind plants.
In areas where it is difficult to find sites, one large turbine on a tall tower uses the wind extremely efficiently.
Small Wind Turbines
Local electrical grids may not be able to handle the large electrical output from a large turbine, so smaller turbines may be more suitable.
High costs for foundations for large turbines may not be economical in some areas.
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