29-06-2012, 12:32 PM
WIND ENERGY,POWERING FUTURE
wind energy.ppt (Size: 1.06 MB / Downloads: 58)
INTRODUCTION
All renewable energy (except tidal and geothermal power), ultimately comes from the sun
The earth receives 1.74 x 1017 watts of power (per hour) from the sun
About one or 2 percent of this energy is converted to wind energy (which is about 50-100 times more than the energy converted to biomass by all plants on earth
Wind Energy Technology
At it’s simplest, the wind turns the turbine’s blades, which spin a shaft connected to a generator that makes electricity. Large turbines can be grouped together to form a wind power plant, which feeds power to the electrical transmission system.
WINDMILL DESIGN
A Windmill captures wind energy and then uses a generator to convert it to electrical energy.
The design of a windmill is an integral part of how efficient it will be.
When designing a windmill, one must decide on the size of the turbine, and the size of the generator.
SMALL 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.
Landscape considerations