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Gemasolar, concentrated solar power plant (Spain)

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Published on Mar 19, 2018

Gemasolar is a 19.9 MWe thermosolar power plant with 120 MWt molten salt central receiver. Solar field of 310,000 m2 mirror surface. Solar thermal energy collected and stored in molten salts for 15 hours of production, and steam turbine with 3 pressure levels. Gemasolar is the first commercial plant in the world to use the high temperature tower receiver technology together with molten salt thermal storage of very long duration.

The heliostats set up around the tower reflect and concentrate solar energy onto the molten salt receiver located at the top of the tower. In the receiver, solar energy is transferred to the molten salts circulating inside, which reach a temperature of 565 ºC. By means of a steam generation system, the molten salts produce overheated steam, that runs a turbine/alternator group to generate electrical energy which then is fed into the power grid. The Gemasolar plant design has been optimised using the SENSOL, a programe developed by SENER that defines the heliostats positioning in the solar field.

PROJECT DATA:
- Total mirror surface: 310,000 m2.
- Number of heliostats: 2,650.
- Field surface area: 195 Ha.
- Receiver capacity: 120 MWt.
- Tower height: 140 m.
- Thermal storage capacity: 670 MWhth (15 h).
- Turbine capacity: 19.9 MWe.
- Thermal cycle efficiency: 40%.
- Annual normal direct radiation: 2,100 KWh/m2.

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