Breakthroughs in Solar Power Technologies

Topics: Solar energy, Solar cell, Photovoltaics Pages: 4 (1148 words) Published: September 13, 2007
Throughout history, mankind has been using the natural energy of the sun, known as solar energy to meet his energy needs. Solar power involves using these emissions of heat and light by the sun to produce electrical or thermal energy. The sun, the most inexhaustible, renewable source of energy known, reaches the Earth's surface to provide 10,000 times more energy than we consume. Numerous devices for collecting solar energy and converting it into electricity have been developed throughout the years, and solar energy is now being used in a variety of ways.

While solar energy has been available to mankind since prehistoric times, we have not always been able to use it as effectively as other sources due to a lack of technology. Solar energy may be used for simple purposes, like drying clothes, cooking, heating swimming pools and buildings, or for more complex tasks like powering telecommunication towers, solar cars, and satellites through solar power technologies which can be divided into mainly two groups; solar thermal technologies and photovoltaics. The latter convert sunlight directly into electricity while solar thermal technologies use solar energy to convert light to heat to electrical energy. Solar thermal technologies being developed include concentrating solar power systems, flat plate solar collectors, and passive solar heating.

Concentrating solar power technologies generate electricity with heat through collectors. Concentrating solar collectors typically use reflective materials such as mirrors or lenses to concentrate the sun's energy to provide heat energy which is then converted into electricity. This can be done in three ways. The first method is the parabolic trough systems which use curved mirrors to concentrate the sun's heat onto a tube which contains a fluid, usually oil. The hot oil then boils water to produce steam which is used to generate electricity. Alternatively, mirrors in the shape of a dish can be also used to concentrate...

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