Solar energy
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Date: May 2011 Time:
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Solar energy is an extremely important source of renewable energy. Solar energy is a rapidly growing sector of the industry, because of the cost-effectiveness and protection of the natural environment.
The acquisition of solar energy is enabled by photovoltaic cells (also called photo elements, solars, or solar cells). This device converts obtained solar energy to electricity. This is a result of the use of semiconductor pn-type connectors, and the flow of electrons leads to an electrical voltage. The effect of photovoltaic was noticed by A.C. Becquerel in 1839. Energy generation using photovoltaic cells, is associated with higher costs than in the case of nuclear energy. However, this solution is used to provide electricity either in areas isolated from other sources, or in homes situated in unfavorable terrain. Solar cells also allow us to produce a small voltage in portable devices with low power, such as calculators, clocks and lamps. They also work well in space, where there is no shortage of solar energy and other sources would require specific fuels.
It happens, that photovoltaic cells are used to power telephones, cameras, traffic monitoring and measuring devices. This is possible because of the small amount of time required to power these devices. In the case of price reductions of photo cells, there would be a possibility of using them in larger devices, without having a drastic increase in prices on the items or equipment.
Most commonly, solar energy is used to generate electricity by using special rechargeable batteries. Processing of solar is allowed thanks to water and air collectors, they produce heat that can be used to heat homes and other facilities, heat water and dry agricultural products.
Extremely futuristic way of generating energy extracted from solar radiation, can be based on the power mirrors. In the first version, it uses the so-called Stirling engine. The heat gathered from the system of mirrors, with the help of engine, drives the electric generator, thus creating a solar power plant with an average power of 25 kW. Another option provides an extensive system of movable mirrors in the center of which there would be a heating tower. Obtaining heat at a temperature of up to 3000 Celsius degrees and directing sunlight to a specific point on the tower (the stove, filled with liquid sodium), would provide the power of the order of 11 MW.
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August 2011 at , by
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What a great resuorce this text is.
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