Evaluation of Multilayer Thin Film Coatings for Solar Thermal Applications

The multilayer thin film coatings are one of the proven technologies for improvement in solar thermal and optical applications. In current solar thermal and optical systems, multilayer thin film coatings find application in many functions such as photovoltaics, heat exchangers, filters, sensor techn...

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Bibliographic Details
Published in:Arabian journal for science and engineering (2011) 2019-09, Vol.44 (9), p.7789-7797
Main Authors: Muralidhar Singh, M., Kumar, Harinandan, Nagesha, K. V., Sivaiah, P., Hemath Kumar, G., Ajay, K. M., Vijaya, G.
Format: Article
Language:English
Subjects:
Absorptance
Absorptivity
Aluminum oxide
Coatings
Emittance
Engineering
Heat exchangers
High temperature
Humanities and Social Sciences
Laser windows
Magnetron sputtering
Morphology
multidisciplinary
Multilayers
Nickel
Optical properties
Photovoltaic cells
Reflectors
Research Article - Mechanical Engineering
Science
Solar cells
Solar heating
Stainless steels
Substrates
Surface finish
Thin film coatings
Thin films
Tubes
Tungsten
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Summary:The multilayer thin film coatings are one of the proven technologies for improvement in solar thermal and optical applications. In current solar thermal and optical systems, multilayer thin film coatings find application in many functions such as photovoltaics, heat exchangers, filters, sensor technologies, laser windows, mirrors, reflectors and optics for digital projections. The solar absorptance and thermal emittance of the multilayer thin film coatings are one of the leading factors for its applicability in said areas. The processing conditions, morphology and surface finish influence the solar absorptance and thermal emittance behavior of multilayer thin film coating. Therefore, emphasis has given in this paper to deposit multilayer thin film coatings with an increased solar absorptance and decreased thermal emittance to improve its applicability in solar thermal applications. Multilayer thin film coatings (Al 2 O 3 /Ni/W–Al 2 O 3 /W) were deposited using DC/RF magnetron sputtering on the stainless steel substrate to improve its applicability in solar thermal receiver tube for power generation. The performance of this multilayer thin film was investigated by measuring the absorptance and emittance using 410 Solar and ET 100 in the solar spectrum region at a variable incident angle from 20° to 60°. The effect of optical properties, microstructure and morphology of the multilayer thin film coatings was also investigated. The maximum absorptance 0.92 and minimum emittance
ISSN:2193-567X
1319-8025
2191-4281
DOI:10.1007/s13369-019-03904-9