Wind power or wind energy, is one of the most exploited by natural forces of human society. The idea of using the wind to transport, water supply, climate control, food processing and originates from the oldest cultures
Sumerian and Egyptian cultures used wind energy to navigate the rivers Tigris, Euphrates and Nile river trade promotion in sailboats.
The Greeks related with the wind gods as one of the four elements that gave rise to the world apart from the earth, water and fire. They felt that the forces of nature were divine and should not be dominated by men, so the Greeks did not use the wind as energy.
In the second century B.C. Mongolia wheel wind-driven aimed at making noises for prayer rituals in religious celebrations incorporated. These wheels have a vertical axis and two species of canvas or skins in a “C” along the axis opposite one another to move the wheel by the momentum of the wind. Later it spread to Persia and China. After the disappearance of slavery in Rome in the IV and V centuries it became very popular hydraulic mill to solve the problem of lack of manpower; however, there are precedents for the use of the mills from the first century B.C. in the towns of northern Italy.
The Persians introduced the vertical axis mill for grinding grain. The mill had three independent parts, a wall in the form of “C” for the inner and outer flat by, the inside of the wall had thus to rosar with mill. The mill was 6 blades or vanes leather or canvas to capture the wind. Half the mill turned by friction on the wall of a “C” for grinding grain and half left in the open to be moved by the wind. The third was another wall forming a gate to let the wind more strongly.
The Arabs also changed the angle of the shaft to create the horizontal axis mill, this setting allowed them to use the windmill to pump water. In the fifteenth to nineteenth centuries the mills began to have more applications. Among them was the water pumping at low sea level, wood sawmills, paper mills, oil extraction and crushing of any type of material lands.
The Al-Tabri and Al-Masudi Arabs began using mills with dual function, these were the flour mills and water mills. Mills built thanks to the explanations of slaves brought from the East. The Arabs were the ones who introduced this invention to Spain.
In 1745 the Arabs would put wooden blades to the mill and in 1772 he introduced springs to the blades to have a constant rotation of the mill in case of strong winds thus managed to control it manually or automatically.
After a while I was also added hydraulic brakes to stop the movement of the blades and airfoils were also used in a helix to improve performance of the weak mills.
these became the characteristic symbol of the country, in the Netherlands in the nineteenth century about 9,000 mills were built.
Late last century Denmark began to use the wind turbine to generate electricity and spread throughout the world. In arid regions of the western United States mills for pumping water on a large scale they were used.
At present there are large wind farms all over the world. Wind technology continues to evolve and with each passing reach higher levels of complexity year. Currently there are many styles of mill and also many hybrid systems that combine wind power with other energy sources.
In 2011 the 5 countries leaders in the production of wind energy were China, the United States, Germany, Spain and India.