Proyecto de Investigación: RAISELIFE 686008
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686008
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RAISELIFE project extends the lifetime of functional CSP materials
(AIP Publishing, 2022-05-12) Sutter, Florian; Binyamin, Yaniv; Zoschke, T.; Fernández García, Aránzazu; Naamane, S.; Galetz, M.; Reoyo Prats, R.; Pérez Trujillo, F. J.; Aglüro, Alina; Orioli, F.; Piron, Javier; Mandler, D.; Attout, A.; Caron, Simon; Wette, J.; Sánchez, Ricardo; Morales, Angel; Hildebrandt, C.; European Commission (EC)
The RAISELIFE project was conducted from April 2016 until March 2020 and was funded within the H2020 program of the European Commission (Grant 686008). The project aimed at developing novel materials with extended lifetime and performance for parabolic-trough and solar tower CSP plants and thereby reducing electricity generation costs. In order to assess the expected durability of the novel materials, improved accelerated aging and qualification methods simulating in-service conditions in different climates were developed. The project brought together a broad consortium formed of industry partners, SMEs and research institutes of the CSP and material science sector. This paper summarizes the main developments and takeaways from the RAISELIFE project.
Laboratory intercomparison of solar absorptance and thermal emittance measurements at room temperature
(Elsevier, 2022-05-14) Caron, Simon; Herding, L.; Binyamin, Y.; Baidossi, M.; Vinetsky, Y.; Morales, Angel; Hildebrandt, C.; Reoyo Prats, R.; Faugeroux, O.; Agüero, A.; Rodríguez, Sergio; Sutter, Florian; Röger, M.; Manzano Agugliaro, F.; European Commission (EC)
Solar thermal absorber coatings play an important role in the opto-thermal efficiency of receivers in Concentrated Solar Power (CSP). Two standard figures of merit are the solar absorptance αsol and thermal emittance εth, derived from spectral directional hemispherical reflectance measurements at room temperature. These two figures of merit allow comparing coating formulations in terms of performance and durability.
In this study, a black coating and a solar selective coating are optically characterized by different laboratories to compare spectral datasets, solar absorptance αsol and thermal emittance εth calculations. The comparison includes various benchtop spectrophotometers operating in the UV-VIS-NIR and Infrared spectral ranges as well as three commercial portable reflectometers/emissometers.
A good agreement is found between the nine parties participating in this intercomparison campaign. The black coating αsol value is 96.6 ± 0.2%, while the solar selective coating αsol value is 94.5 ± 0.4%. For the thermal emittance, spectral data is concatenated and integrated from 0.3 to 16 μm. The black coating εth value calculated at 650 °C is 80.8 ± 3.8%, while the solar selective coating εth value calculated at 650 °C is 25.0 ± 0.5%.
10,000 h molten salt corrosion testing on IN617, uncoated and aluminide ferritic steels at 580 ºC
(Richter C., 2020-12) Agüero, A.; Audigié, P.; Rodríguez, Sergio; European Commission (EC)
Long term testing of two ferritic-martensitic steels (P91 and VM12-SHC) with and without slurry deposited aluminide coatings containing 20 wt.% of Al at the surface was carried out by exposing these materials to the Solar Salt, a eutectic mixture composed of 60 % NaNO3 - 40 % KNO3 at 580ºC. This salt is currently used in operating thermal solar power plants as heat transfer and storage fluid. Tubes made of expensive Ni based alloys are employed to mitigate corrosion. The tested uncoated ferritic materials exhibited very high corrosion rates developing thick, easily detached scales. IN617 was also tested as a reference and experienced very low corrosion up to 5,000 h, but after 10,000 h a 50 ȝm thick, mostly NiO scale had developed with Na0.6CoO2 crystals deposited on top. There was also evidence of significant Cr depletion at the alloy surface. Carcinogenic CrVI was found in the Solar Salt melt in which the three uncoated alloys were immersed. In contrast, the two coated ferritic steels did not show evidence of degradation after 10,000 h and the most significant microstructural change was the development of a very thin protective NaAlO2 layer on their surface. An industrial process to deposit these coatings on the inner surfaces of pipes has already been developed.
