Reducing a carbon footprint.
Reducing a carbon footprint: Solar energy is energy that is derived from the sun. Every hour the sun beams onto Earth more than enough energy to satisfy global energy needs for an entire year. Solar energy is the technology use to harness the sun’s energy and make it useable.
Today, the technology produces less than one tenth of one percent of global energy demand. Many people are familiar with so-called photovoltaic cells, or solar panels, found on things like spacecraft, rooftops, and handheld calculators.
The cells are of semiconductor materials like those found in computer chips. When sunlight hits the cells, it knocks electrons loose from their atoms. As the electrons flow through the cell, they generate electricity.
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thermal storage capabilities, but can be hybridise to run on fossil fuel during periods without sunshine. The Stirling engine is the most common type of heat engine use in dish-engine systems.
For extremely high inputs of radiant energy, a multiplicity of flat mirrors, or heliostats, using altazimuth mounts, can be use to reflect their incident direct solar radiation onto a common target as shown in This is calle the heliostat field or central receiver collector.
By using slightly concave mirror segments on the heliostats, large amounts of thermal energy can be direct into the cavity of a steam generator to produce steam at high temperature and pressure. The concentrated heat energy absorbed by the receiver is transferred to a circulating fluid that can be stored and later used to produce power. Central receivers have several advantages:
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