Principle of the concentration of the solar irradiation, the Solar Thermal Power Plants power plants.
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Principle of the concentration of the solar irradiation, the Solar Thermal Power Plants power plants. Solar thermal power plants: Used mainly in the United States, this system concentrates sunlight thanks to mirrors and parabolic dishes. Very high temperatures (from 400 ° C up to 1000 ° C) are then obtained and this heat will turn the water of the boiler into steam. Under pressure, it will activate the turbines that will themselves operate the alternator to produce the alternating current. This type of plant allows, by storing this fluid in a tank, to prolong the operation of the plant several hours beyond sunset. The plant consists of a field of solar collectors called heliostats that concentrate the sun's rays to a fixed focus, located at the top of a tower. In cylindrical parabolic mirrors these concentrate the radiation on tubes filled with a fluid. A similar technology, Fresnel mirrors, uses flat mirrors that pivot around a horizontal axis to follow the Sun