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Concentrated solar power

Solar power is not only harvested by means of solar cells or solar thermal energy, but also through so-called concentrated solar power technology – which many people regard as the most promising means of converting the sun’s powerful rays into useable energy.

On the plains outside Seville, Spain, a 115-metre high concrete tower was built in 2006. From the ground, 624 moveable mirrors reflect the sun towards a point at the top of the tower, as shown in the picture. The solar energy boils water and the steam drives turbines which generate electricity. The steam can be stored and can continue to produce electricity after sunset, thus resolving one of the main problems of solar power generation – that power can only be produced when the sun is shining. By 2013 solar towers will produce enough electricity for all of Seville’s 180 000 households. This means an annual reduction in emissions of 600 000 tonnes of CO₂.

Sun dishes, resembling TV satellite dishes, are another promising concentrated solar-power technology. Solar energy is guided towards the centre-point of the dish and channelled onwards into a material that can absorb the heat. Many dishes can be used simultaneously to form a larger sun park. Spain plays a central position in the development of concentrated solar energy, but the technology is global. Researchers are looking especially at desert areas. Solar radiation bombards the deserts with more power in the course of six hours than the entire population of the world uses in a year.

Sending solar-generated electricity from the deserts to the rest of the world is not just a wild science-fiction idea. This summer, 12 German companies signed an agreement to build several concentrated solar power stations in the Sahara. The goal is that these power plants will supply 15 percent of Europe’s electricity requirement through undersea cables. Critics say that the project will consume large amounts of water in an arid area with water shortages. The Sahara Forest Project (described later in this magazine), combines concentrated solar power with salt-water greenhouses. The synergy between these technologies makes it possible to construct a power plant in the desert that does not consume local resources of fresh water.

Read more:
http://www.power-technology.com/projects/Seville-Solar-Tower/
http://www.inhabitat.com/2007/05/21/sevilles-solar-power-tower/
http://www.ka-muenchen.de/253+M52087573ab0.0.html
http://www.sbp.de/en/fla/mittig.html
http://en.wikipedia.org/wiki/List_of_solar_thermal_power_stations
http://www.renewableenergyworld.com/rea/news/article/2009/05/global-concentrated-solar-power-industry-to-reach-25-gw-by-2020?cmpid=WNL-Friday-May8-2009
www.desertec.org
http://www.ft.com/cms/s/0/759b35a6-6f00-11de-9109-00144feabdc0.html?nclick_check=1
http://www.renewableenergyworld.com

http://www.renewableenergyworld.com/