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Energy Alternatives

July 5th, 2012

The solar energy is the obtained energy of the Sun. The incident Earth solar radiation and can take advantage, by its capacity to warm up, or directly, through advantage of the radiation in optical devices. It is a type of energy of renewable character, reason why is known it like green energy. The power of the radiation varies according to the moment of the day, the atmospheric conditions cushion that it and the latitude. It is possible to be assumed that, in good conditions of irradiation, the S-value of approximately 1000 W/m in the terrestrial surface. This power is known it like irradiance. The radiation is usable in its components direct and diffuse, or in the sum of both. The direct radiation arrives directly from the solar center, without reflections or refractions that are intermediate.

The diffuse one is emitted by the diurnal celestial vault thanks to the multiple phenomena of reflection and solar refraction in the atmosphere, clouds and the rest of elements terrestrial atmospherics and. The direct radiation can to be reflected and to concentrate themselves for its use, however are not possible to concentrate the diffuse light that it comes from all the directions. The Aeolian energy is the obtained energy of the wind, that is to say, the generated kinetic energy as a result of the airflows, and that are transformed into other useful forms for the man. The Aeolian term comes from the Aeolicus Latin, and is regarding Eolo, God of winds in Greek mythology. The Aeolian energy has been taken advantage of from the antiquity to make move the boats driven by candles or make work the machinery of mills when moving its vanes. Today the Aeolian energy is used mainly to generate electrical energy by means of aerogenerators. At the end of 2007, the world-wide capacity of 94,1 the Aeolian generators was of gigawatts. While the Aeolian one generates around 1% of the consumption of world-wide electricity, it represents around 19% of the electrical production in Denmark, 9% in Spain and Portugal, and a 6% in Germany and Ireland.

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