Renewable sources of energy: WIND
Wind is a renewable energy source because the wind will blow as long as the sun shines.
Today, wind energy is mainly used to generate electricity.
Electricity Generation from Wind
Wind machines (also called wind turbines) use blades (“pales”) to collect the wind’s
kinetic energy. The wind flows over the blades creating lift, like the effect on airplane wings,
which causes them to turn. The blades are connected to a shaft (“eix”) that turns an electric
generator to produce electricity.
Wind Power
Wind power is the conversion of wind energy into a useful form of energy, such as using: wind turbines to make electricity, windmills for mechanical power, windpumps for water pumping or drainage, or sails to propel ships.
Although very consistent from year to year, wind power has significant
variation over shorter timescales. The intermittency of wind seldom
creates problems when used to supply up to 20% of total electricity
demand, but as the proportion increases, a need to upgrade the grid,
and a lowered ability to supplant conventional production can occur.
Power management techniques such as having excess capacity storage,
dispatchable backing supplies (usually natural gas), storage such as
pumped-storage hydroelectricity,
exporting and importing power to neighboring areas or reducing demand
when wind production is low, can greatly mitigate these problems.
http://moodle.iesjalcover.net/file.php/205/energy-renewable_sources.pdf
http://en.wikipedia.org/wiki/Wind_Energy
WEBPAGE MADE BY: Mar Bennasar