Withsolar thermodynamicclean electricity is produced through a series of conversions. It starts with heat, moves on to mechanical energy and then arrives at the production of electricity. Thanks to the technology ofsolar thermodynamicsolar radiation is "concentrated" (in fact the solar thermodynamicand also calledconcentrated solar power) on a fluid that by heating manages to generate mechanical energy which in turn produces electrical energy.
There are several systems that exploit the principle ofsolar thermodynamic. Descriptively, these systems can be grouped into three different categories, we have as follows:
-installationssolar thermodynamicswith linear parabolic collectors
-installationssolar thermodynamicscentral tower
Systems alinear parabolic collectorsare among the types ofconcentration plantsmost popular. They consist of rows of collectors which, thanks to their particular parabolic shape, are able to reflect solar radiation up toconcentrate them on a receiver tube. A heat transfer fluid flows inside the tube, usually the fluid is given by amineral oil, frommolten saltsor from agas, materials that have the ability to reach temperatures up to 400 degrees. With theconcentrationof the solar rays on the receiver tube the first energy conversion takes place: solar radiation becomes thermal energy which, transported and transformed into steam, is able to activate the steam cycle and generate electric current with a thermal efficiency that is around 30-90 MW .
The systemscentral tower solar systemsthey can to concentrate solar radiation using heliostats (reflecting mirrors arranged in a circle). Heliostats are able to follow the movement of the sun andto concentrate radiation to a receiver placed on a tower. Being a systemsolar thermodynamic, there is a fluid that reaches high temperatures, produces steam which, by operating a turbine, is able to generate electricity. In this case the fluid is placed in a boiler located at the level of the receiver (on the tower).
The systemsdish-stirlingthey consist of “plates” connected to an engine, the so-called stirling. The dish works as a reflector which, following the movement of the sun, concentrates the radiation on the receiver (the “stirling” engine) with external combustion. The receiver, placed on the focal point (right where you areconcentratethe sun's rays deflected by the parabola), it works with all heat sources by exploiting the potential of closed-cycle gas. The thermal energy is transformed into mechanics and, later, into electricity by means of an alternator.
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