Coloured Solar-thermal Absorbers – A Comparative Analysis of Cermet Structures

Duţă, Anca; Isac, Luminita; Milea, Andrea; Ienei, Elena; Perniu, Dana

doi:10.1016/j.egypro.2014.02.064

Cited by 17 publications

(11 citation statements)

References 21 publications

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“…Previous results reported by our group [5] showed a very good infiltration of the Fe 2 O 3 pigment, particularly when Au NPs are included in the coating structure, when Fe 2 O 3 layers infiltrate the small Au NP among the columnar oxide structures. In this study, the morphology of sample A1/AO/Fe 2 O 3 -Au show that Fe 2 O 3 pigment is mostly good infiltrated in the alumina matrix (A1/AO) but large agglomerates are formed also on the alumina matrix and/or grow on the Au NPs.…”

Section: Colored Absorber Coatingsmentioning

confidence: 86%

“…The difference in the pigment composition and structure may influence the optical properties of the investigated red absorber coatings. Moreover, it was already reported [5] that tailoring the surface charge of the matrix (OA is slightly negatively charged) and of the Au NPs may represent an instrument in tuning polycrystallinity.…”

Section: Colored Absorber Coatingsmentioning

confidence: 98%

“…Three types of TISS structures were analyzed with Fe 2 O 3 , V 2 O 5 and CuS as red, green-yellow and dark green pigments [5].…”

Section: Colored Absorber Coatingsmentioning

confidence: 99%

“…Colored TISS coatings, integrally obtained using spray pyrolysis technique (SPD), by embedding oxides (Fe 2 O 3 , V 2 O 5 ) and sulphide (CuS) pigments in an alumina matrix were recently developed in our research group [5]. Bright red spectral selective coatings with spectral selectivity of 12.4 were obtained using Fe 2 O 3 pigment with embedded Au NPs, deposited on Al/Al 2 O 3 matrix.…”

Section: Introductionmentioning

confidence: 99%

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Spectrally Solar Selective Coatings for Colored Flat Plate Solar Thermal Collectors

Isac

Eneşca

Mihoreanu

et al. 2014

Springer Proceedings in Energy

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The paper is a review on the state-of-the-art on colored materials (absorbers and glazings) for solar thermal flat plate collectors obtained world-wide. The best results obtained by the group active in the R&D Centre Renewable Energy Systems and Recycling are also reported and they are related to the steps followed in developing and optimizing the absorber plate (substrate, the alumina matrix, the colored coatings and the anti-reflexion layer) and the glazing (as anti-reflexive coating and/or as colored component). These results represent a promising input for novel, market-acceptable flat plate solar-thermal collectors, with increased architectural acceptance, for facades integration in Nearly Zero Energy Buildings.

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Section: Colored Absorber Coatingsmentioning

confidence: 86%

Section: Colored Absorber Coatingsmentioning

confidence: 98%

“…Three types of TISS structures were analyzed with Fe 2 O 3 , V 2 O 5 and CuS as red, green-yellow and dark green pigments [5].…”

Section: Colored Absorber Coatingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectrally Solar Selective Coatings for Colored Flat Plate Solar Thermal Collectors

Isac

Eneşca

Mihoreanu

et al. 2014

Springer Proceedings in Energy

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“…Although Equations (2) and (3) look similar, the wavelength ranges are different. The range of solar absorptance is between the visible and near-infrared regions of solar irradiance, but that of the thermal emittance is temperature-dependent and usually in the infrared regions, where the blackbody radiation dominates [73,74]. By following the Equation (1), a solar absorber can achieve high temperature by maximizing the solar absorptance while keeping low thermal radiation and low heat convection.…”

Section: Thermal Managementmentioning

confidence: 99%

Novel Receiver-Enhanced Solar Vapor Generation: Review and Perspectives

Raza

Alzaim

et al. 2018

Energies

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Efficient solar vapor/steam generation is important for various applications ranging from power generation, cooling, desalination systems to compact and portable devices like drinking water purification and sterilization units. However, conventional solar steam generation techniques usually rely on costly and cumbersome optical concentration systems and have relatively low efficiency due to bulk heating of the entire liquid volume. Recently, by incorporating novel light harvesting receivers, a new class of solar steam generation systems has emerged with high vapor generation efficiency. They are categorized in two research streams: volumetric and floating solar receivers. In this paper, we review the basic principles of these solar receivers, the mechanism involving from light absorption to the vapor generation, and the associated challenges. We also highlight the two routes to produce high temperature steam using optical and thermal concentration. Finally, we propose a scalable approach to efficiently harvest solar energy using a semi-spectrally selective absorber with near-perfect visible light absorption and low thermal emittance. Our proposed approach represents a new development in thermally concentrated solar distillation systems, which is also cost-effective and easy to fabricate for rapid industrial deployment.

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