Abstract
This work deals with the application of femtosecond-laser-inscribed fiber Bragg gratings (FsFBGs) for monitoring the internal high-temperature surface distribution (HTSD) in solar receivers of concentrating solar power (CSP) plants. The fiber-optic sensor system is composed of 12 FsFBGs measuring points distributed on an area of 0.4 m2, which leads to obtain the temperature map at the receiver by means of two-dimensional interpolation. An analysis of the FsFBG performance in harsh environment was also conducted. It describes the influence of calibration functions in high-temperature measurements, determines a required 10 nm spectral interval for measuring temperatures in the range from 0 to 700 °C, and reveals wavelength peak tolerances in the FsFBG fabrication process. Results demonstrate the viability and reliability of this measuring technique, with temperature measurements up to 566 °C.
Highlights
Concentrating solar power (CSP), known as solar thermal electricity (STE), is one of the renewable-energy technologies capable of large-scale and dispatchable power production
A fiber-optic sensor system was proposed for monitoring the temperature surface distribution in central receivers of CSP plants
The sensor design is based on a set of 12 femtosecond-laser-inscribed fiber Bragg gratings (FsFBGs) for temperature measurements up to 700 ◦ C
Summary
Concentrating solar power (CSP), known as solar thermal electricity (STE), is one of the renewable-energy technologies capable of large-scale and dispatchable power production. Central Receiver System (CRS), or Solar Tower, is considered to have the highest solar-to-electricity conversion efficiency, since it allows us to achieve high temperatures. In CRS–CSP plants, moving mirrors or heliostats concentrate direct solar radiation on a solar receiver located on top of the tower. The concentrated solar energy is transferred as thermal energy to a liquid medium or heat-transfer fluid. More than 1300 MWe of CRS–CSP plants has been installed all around the world, including countries such as Spain, Israel, United States, China, South Africa, Morocco, or Chile [4]
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