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Articoli di riviste sul tema "Selective solar surfaces"

Autore: Grafiati

Pubblicato: 27 settembre 2023

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1

Konttinen, P., P. D. Lund e R. J. Kilpi. "Mechanically manufactured selective solar absorber surfaces". Solar Energy Materials and Solar Cells 79, n. 3 (settembre 2003): 273–83. http://dx.doi.org/10.1016/s0927-0248(02)00411-7.

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2

Monteiro, F. J., e F. Oliveira. "Ageing of black solar selective surfaces". Solar Energy Materials 21, n. 4 (gennaio 1991): 297–315. http://dx.doi.org/10.1016/0165-1633(91)90028-j.

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3

Davoine, F., P. A. Galione, J. R. Ramos-Barrado, D. Leinen, F. Martín, E. A. Dalchiele e R. E. Marotti. "Modeling of gradient index solar selective surfaces for solar thermal applications". Solar Energy 91 (maggio 2013): 316–26. http://dx.doi.org/10.1016/j.solener.2012.09.019.

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4

Yin Zhi-qiang. "SPUTTERED ALUMINIUM-CARBON-OXYGEN SOLAR SELECTIVE ABSORBING SURFACES". Acta Physica Sinica 35, n. 10 (1986): 1369. http://dx.doi.org/10.7498/aps.35.1369.

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5

Yin, Y., D. R. McKenzie e W. D. McFall. "Cathodic arc deposition of solar thermal selective surfaces". Solar Energy Materials and Solar Cells 44, n. 1 (ottobre 1996): 69–78. http://dx.doi.org/10.1016/0927-0248(96)00026-8.

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6

Kunç, S. "Rough metallic selective surfaces for solar energy applications". Solar & Wind Technology 3, n. 2 (gennaio 1986): 147–51. http://dx.doi.org/10.1016/0741-983x(86)90027-5.

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7

Khodasevych, Iryna E., Liping Wang, Arnan Mitchell e Gary Rosengarten. "Micro- and Nanostructured Surfaces for Selective Solar Absorption". Advanced Optical Materials 3, n. 7 (5 maggio 2015): 852–81. http://dx.doi.org/10.1002/adom.201500063.

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8

Mwamburi, Mghendi, e Ewa Wäckelgård. "Doped tin oxide coated aluminium solar selective reflector surfaces". Solar Energy 68, n. 4 (2000): 371–78. http://dx.doi.org/10.1016/s0038-092x(00)00030-x.

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Serra, M., e D. Sainz. "Development of CuO selective surfaces for solar energy utilization". Solar Energy Materials 13, n. 6 (luglio 1986): 463–68. http://dx.doi.org/10.1016/0165-1633(86)90079-1.

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10

Cen, Hanyu, Sara Nunez-Sanchez, Andrei Sarua, Ian Bickerton, Neil A. Fox e Martin J. Cryan. "Solar thermal characterization of micropatterned high temperature selective surfaces". Journal of Photonics for Energy 10, n. 02 (18 maggio 2020): 1. http://dx.doi.org/10.1117/1.jpe.10.024503.

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11

Koltun, M., G. Gukhman e A. Gavrilina. "Stable selective coating “black nickel” for solar collector surfaces". Solar Energy Materials and Solar Cells 33, n. 1 (maggio 1994): 41–44. http://dx.doi.org/10.1016/0927-0248(94)90287-9.

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12

Fernandes, João C. S., Ana Nunes, M. João Carvalho e Teresa C. Diamantino. "Degradation of selective solar absorber surfaces in solar thermal collectors – An EIS study". Solar Energy Materials and Solar Cells 160 (febbraio 2017): 149–63. http://dx.doi.org/10.1016/j.solmat.2016.10.015.

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13

Alves Albuquerque Araújo, Felipe, Francisco Nivaldo Aguiar Freire, Diego Caitano Pinho, Kaio Hemerson Dutra, Paulo Alexandre Costa Rocha e Maria Eugênia Vieira da Silva. "Study of surfaces, produced with the use of granite and titanium, for applications with solar thermal collectors". REVIEWS ON ADVANCED MATERIALS SCIENCE 60, n. 1 (1 gennaio 2021): 47–56. http://dx.doi.org/10.1515/rams-2021-0005.

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Abstract The present work consisted in obtaining and studying selective surfaces for applications in low-cost flat plate solar collectors, using residues from the granite industry. Five different surfaces were studied, varying the percentage by weight: 100% granite powder, 75% granite powder + 25% titanium oxide, 50% granite powder + 50% titanium oxide, 25% granite powder + 75% titanium oxide and 100% titanium oxide. For the tests, an experimental wooden bench was built, and it was possible to simulate the conditions of a flat plate solar collector. For characterization of the surfaces, SEM techniques, infrared analysis and UV-VIS absorbance determination were used, as well as graphs with surface temperatures and with radiation in the sun tests. The efficiency of the surfaces was determined by the ratio of the absorptivity through the emissivity, as well as the trademark MRTiNOX. An efficiency of 23.58 was obtained for this, while for the 50% granite - 50% titanium surface the value of 23.30 (closest to the trade mark) was calculated. Therefore, replacing the traditional components of selective surfaces with granite proved to be a satisfactory solution, contributing to the reduction of costs with solar energy.

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AlShamaileh, Ehab, Abdelmnim M. Altwaiq, Muayad Esaifan, Heba Al-Fayyad, Ziad Shraideh, Iessa Sabbe Moosa e Imad Hamadneh. "Study of the Microstructure, Corrosion and Optical Properties of Anodized Aluminum for Solar Heating Applications". Metals 12, n. 10 (29 settembre 2022): 1635. http://dx.doi.org/10.3390/met12101635.

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Humans are increasingly required to harvest green solar energy in order to reduce energy bills and save the environment from the excessive use of fossil resources. In this article, the microstructures of both commercial non‑colored anodized Al and commercial blackened anodized Al were studied using optical and scanning electron microscopy in order to interpret the results of their use as solar absorbing surfaces. Microscopic examination showed that the thickness of the anodization layers of the non-colored anodized Al and the blackened anodized Al were approximately 11 µm and 14 µm, respectively, and they were perfectly adhered to the mother Al. The corrosion rate of all studied Al surfaces was investigated using the potentiodynamic polarization technique in 3.5% NaCl as the corrosive medium. The blackened anodized Al surface exhibited the highest corrosion resistance, which made it the best surface for solar heating systems. Moreover, raw Al, matte black painted Al, and blackened anodized Al were tested as selective surfaces for solar radiation in different weather conditions. Our results demonstrated the superiority of the blackened anodized Al in terms of the ability to absorb solar radiation, in addition to its higher corrosion resistance properties. In experimental testing, temperature values higher than 90 °C were reached several times. A gain of an extra 5 °C was achieved when using a double-glazed cover in comparison with a single-glazed setup. In conclusion, we highly recommend using a commercial blackened anodized Al surface to manufacture solar absorbing heaters, owing to its similarity in solar radiation absorptivity with the commercial matte black painted Al, excellent corrosion resistance, superior endurance upon long-term exposure to solar radiation, light weight, low price, and availability. Additionally, the light reflectance % test demonstrated the characteristics of the used solar selective surfaces.

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Santagata, Antonio, Maria Lucia Pace, Alessandro Bellucci, Matteo Mastellone, Eleonora Bolli, Veronica Valentini, Stefano Orlando et al. "Enhanced and Selective Absorption of Molybdenum Nanostructured Surfaces for Concentrated Solar Energy Applications". Materials 15, n. 23 (23 novembre 2022): 8333. http://dx.doi.org/10.3390/ma15238333.

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Surfaces of commercial molybdenum (Mo) plates have been textured by fs-laser treatments with the aim to form low-cost and efficient solar absorbers and substrates for thermionic cathodes in Concentrated Solar Power conversion devices. Morphological (SEM and AFM), optical (spectrophotometry), and structural (Raman spectroscopy) properties of the samples treated at different laser fluences (from 1.8 to 14 J/cm2) have been characterized after the laser treatments and also following long thermal annealing for simulating the operating conditions of thermionic converters. A significant improvement of the solar absorptance and selectivity, with a maximum value of about four times higher than the pristine sample at a temperature of 800 K, has been detected for sample surfaces treated at intermediate fluences. The effects observed have been related to the light trapping capability of the laser-induced nanotexturing, whereas a low selectivity, together with a high absorptance, could be revealed when the highest laser fluence was employed due to a significant presence of oxide species. The ageing process confirms the performance improvement shown when treated samples are used as solar absorbers, even though, due to chemical modification occurring at the surface, a decrease of the solar absorptance takes place. Interestingly, the sample showing the highest quantity of oxides preserves more efficiently the laser texturing. The observation of this behaviour allows to extend the applicability of the laser treatments since, by further nanostructuring of the Mo oxides, it could be beneficial also for sensing applications.

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Abdel-Mohsen, Fawzia Fahim, e Hassan Salah Aly Emira. "Spectrally selective nano-absorber pigments". Pigment & Resin Technology 44, n. 6 (2 novembre 2015): 347–57. http://dx.doi.org/10.1108/prt-08-2014-0065.

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Purpose – The purpose of this study was to prepare colour pigments for use as spectrally selective coatings for solar absorbers. Design/methodology/approach – Nano-particles cobalt and nickel oxides were prepared by sol–gel techniques. These oxides were prepared with its molar ratios and annealed at 200, 400, 600 and 800°C. The structure of the pigments was characterized by infrared spectrometer, differential scanning calorimetry analysis, X-ray diffraction, transmission electron microscope and scanning electron microscope. Findings – Encapsulated cobalt and nickel oxides were completely formed at 800 and 600°C, and its colour was black and dark green, respectively. The results confirmed that black and green pigments combined selectivity with colour. Optical properties such as absorption and reflection were affected by the firing temperatures on cobalt and nickel oxides–gel polymers. All synthesized pigments consisted of nano-particles. Research limitations/implications – The prepared samples used in the present work were synthesized from cobalt chloride and nickel acetate. The salts were dispersed in polyacrylamide as a precursor. Practical implications – The prepared metal oxides had good solar properties. Originality/value – Colour becomes more important for thermal solar collectors, and it has attracted interest. This might be related to a generally growing attention towards architectural integration of solar energy systems into building. Architects would prefer different colours besides black, even if lower efficiency would have to be accepted.

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Konttinen, P., R. Kilpi e P. D. Lund. "Microstructural analysis of selective C/Al2O3/Al solar absorber surfaces". Thin Solid Films 425, n. 1-2 (febbraio 2003): 24–30. http://dx.doi.org/10.1016/s0040-6090(02)01141-0.

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18

Zhang, Qi‐Chu, e David R. Mills. "Very low‐emittance solar selective surfaces using new film structures". Journal of Applied Physics 72, n. 7 (ottobre 1992): 3013–21. http://dx.doi.org/10.1063/1.351510.

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19

Ju, Minkyu, Jeongeun Park, Young Hyun Cho, Youngkuk Kim, Donggun Lim, Eun-Chel Cho e Junsin Yi. "A Novel Method to Achieve Selective Emitter Using Surface Morphology for PERC Silicon Solar Cells". Energies 13, n. 19 (6 ottobre 2020): 5207. http://dx.doi.org/10.3390/en13195207.

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Recently, selective emitter (SE) technology has attracted renewed attention in the Si solar cell industry to achieve an improved conversion efficiency of passivated-emitter rear-contact (PERC) cells. In this study, we presented a novel technique for the SE formation by controlling the surface morphology of Si wafers. SEs were formed simultaneously, that is, in a single step for the doping process on different surface morphologies, nano/micro-surfaces, which were formed during the texturing processes; in the same doping process, the nano- and micro-structured areas showed different sheet resistances. In addition, the difference in sheet resistance between the heavily doped and shallow emitters could be controlled from almost 0 to 60 Ω/sq by changing the doping process conditions, pre-deposition and driving time, and temperature. Regarding cell fabrication, wafers simultaneously doped in the same tube were used. The sheet resistance of the homogeneously doped-on standard micro-pyramid surface was approximately 82 Ω/sq, and those of the selectively formed nano/micro-surfaces doped on were on 62 and 82 Ω/sq, respectively. As a result, regarding doped-on selectively formed nano/micro-surfaces, SE cells showed a JSC increase (0.44 mA/cm2) and a fill factor (FF) increase (0.6%) with respect to the homogeneously doped cells on the micro-pyramid surface, resulting in about 0.27% enhanced conversion efficiency.

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Zakirullin, R., e I. Odenbakh. "Smart window for angular selective filtering of solar radiation". E3S Web of Conferences 124 (2019): 01002. http://dx.doi.org/10.1051/e3sconf/201912401002.

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A new approach to angular selective filtering of the solar radiation without using the sunlight redistribution devices is proposed. Parallel strips of chromogenic materials on two surfaces of the pane(s) form an optical filter having angular selective light transmission. Clarified methods to calculate the optimum slope angle of the strips on the pane(s), their widths and relative position on two surfaces considering the seasonal and daily change in the solar radiation, the location of the building and the window’s azimuth are presented. Such a smart window blocks the direct radiation in a preset angular range and transmits the scattered and reflected radiation that is provides comfortable daylighting indoors.

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Haddad, Fouzi, Mustapha Hatti, Khadidja Rahmoun e Katir Ziouche. "Selective Surfaces for Photo-Thermal Conversion for Medium Solar Temperature Applications". International Journal of Heat and Technology 40, n. 1 (28 febbraio 2022): 219–24. http://dx.doi.org/10.18280/ijht.400126.

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There are many effective technologies that have been developed in the field of renewable energy. In this context, this study covers a selective coating used in the photo-thermal conversion on macro-scale devices. The objective of this work is to optimize a silicon-based paint layer for solar application in the low temperature range (T<80℃) where the optimization thickness is found 21 µm. In order to apply the optimization layer (21 µm) in the solar devices that work in the medium temperature range (80℃<T<200℃), we propose to deposit a thin film of indium oxide using an ultrasonic spray chemical vapor deposition USCVD process to obtain finally a bilayer structure (silicon-based paint Thickness-Insensitive Selective Solar TISS / In2O3). The obtained bilayer structure was tested and characterized using spectroscopy of UV-VIS and IR, the last one was used in two modes: specular and diffuse reflection. The structural properties were investigated using the X-rays diffraction (XRD) and the morphological character was analyzed using Scanning Electron Microscope (SEM). In addition, the global results denote that the deposition of In2O3 layer improves the reflection capacity of the optimization layer (21 µm) from 8 to 11 in the NIR range.

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Pratesi, Stefano, Elisa Sani e Maurizio De Lucia. "Optical and Structural Characterization of Nickel Coatings for Solar Collector Receivers". International Journal of Photoenergy 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/834128.

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The development of spectrally selective materials is gaining an increasing role in solar thermal technology. The ideal spectrally selective solar absorber requires high absorbance at the solar spectrum wavelengths and low emittance at the wavelengths of thermal spectrum. Selective coating represents a promising route to improve the receiver efficiency for parabolic trough collectors (PTCs). In this work, we describe an intermediate step in the fabrication of black-chrome based solar absorbers, namely, the fabrication and characterization of nickel coatings on stainless steel substrates. Microstructural characteristics of nickel surfaces are known to favorably affect further black chrome deposition. Moreover, the high reflectivity of nickel in the thermal infrared wavelength region can be advantageously exploited for reducing thermal emission losses. Thus, this report investigates structural features and optical properties of the nickel surfaces, correlating them to coating thickness and deposition process, in the perspective to assess optimal conditions for solar absorber applications.

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Family, Roxana, e M. Mengüç. "Analysis of Sustainable Materials for Radiative Cooling Potential of Building Surfaces". Sustainability 10, n. 9 (28 agosto 2018): 3049. http://dx.doi.org/10.3390/su10093049.

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The main goal of this paper is to explore the radiative cooling and solar heating potential of several materials for the built environment, based on their spectrally-selective properties. A material for solar heating, should have high spectral emissivity/absorptivity in the solar radiation band (within the wavelength range of 0.2–2 μm), and low emissivity/absorptivity at longer wavelengths. Radiative cooling applications require high spectral emissivity/absorptivity, within the atmospheric window band (8–13 μm), and a low emissivity/absorptivity in other bands. UV-Vis spectrophotometer and FTIR spectroscopy, are used to measure, the spectral absorption/emission spectra of six different types of materials. To evaluate the radiative cooling potential of the samples, the power of cooling is calculated. Heat transfer through most materials is not just a surface phenomenon, but it also needs a volumetric analysis. Therefore, a coupled radiation and conduction heat transfer analysis is used. Results are discussed for the selection of the best materials, for different applications on building surfaces.

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Mihelčič, Mohor, Marta Klanjšek Gunde e Lidija Slemenik Perše. "Rheological Behavior of Spectrally Selective Coatings for Polymeric Solar Absorbers". Coatings 12, n. 3 (15 marzo 2022): 388. http://dx.doi.org/10.3390/coatings12030388.

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Since the world’s energy demands are growing rapidly, there is a constant need for new energy systems. One of the cleanest, most abundant, and renewable natural resources available is solar energy; therefore, the development of surfaces with high absorption of solar radiation is increasing. To achieve the best efficiency, such surfaces are coated with spectrally selective coatings, which are strongly influenced by the pigments and resin binders. Spectrally selective paints have a very specific formulation, and since the applied dry coatings should exhibit high spectral selectivity, i.e., high solar absorptivity and low thermal emissivity, the rheological properties of liquid paints are of great importance. In the present work, we studied the effect of the rheological properties of liquid thickness-insensitive spectrally selective (TISS) paints on the spectral selectivity and adhesion of dry coatings on a polymeric substrate. The results showed that the functional and adhesion properties of dry coating on polymeric substrates is strongly dependent on the rheological properties of the binder and catalyst used for the preparation of the liquid paints. It was shown that the paints with good spectral selective properties (thermal emissivity eT < 0.36 and solar absorptivity aS > 0.92) and good adhesion (5B) can be prepared for polymer substrates.

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Wrobel, Edyta, Piotr Kowalik e Janusz Mazurkiewicz. "Selective metallization of solar cells". Microelectronics International 32, n. 1 (5 gennaio 2015): 1–7. http://dx.doi.org/10.1108/mi-05-2014-0020.

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Purpose – This paper aims to present the possibility of the technology of chemical metallization for the production of contact of photovoltaic cells. The developed technology allows you to perform low-cost contacts in any form. Design/methodology/approach – The study used a multi- and monocrystalline silicon plates. On the surface of the plates, the contact by the electroless metallization was made. After metallization stage, annealing process in a temperature range of 100-700°C was conducted to obtain ohmic contact in a semiconductor material. Subsequently, the electrical parameters of obtained structures were measured. Therefore, trial soldering was made, which demonstrated that the layer is fully soldered. Findings – Optimal parameters of the metallization bath was specified. The equations RS = f (metallization time), RS = f (temperature of annealing) and C-V characteristics were determined. As a result of conducted research, it has been stated that the most appropriate way leading to the production of soldered metal layers with good adhesion to the portion of selectively activated silicon plate is technology presented below in the following steps: masking, selective activation and nickel-plating of activated plate. Such obtained metal layers have great variety in application and, in particular, can be used for the preparation of electric terminals in silicon solar cell. Originality/value – The paper presents a new, unpublished method of manufacturing contacts in the structure of the photovoltaic cell.

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Pirouzfam, Niloufar, e Kursat Sendur. "Tungsten Based Spectrally Selective Absorbers with Anisotropic Rough Surface Texture". Nanomaterials 11, n. 8 (7 agosto 2021): 2018. http://dx.doi.org/10.3390/nano11082018.

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Spectrally selective absorbers have received considerable interest due to their applications in thermophotovoltaic devices and as solar absorbers. Due to extreme operating conditions in these applications, such as high temperatures, thermo-mechanically stable and broadband spectrally selective absorbers are of interest. This paper demonstrates anisotropic random rough surfaces that provide broadband spectrally selective absorption for the thermo-mechanically stable Tungsten surfaces. Anisotropic random rough surface has different correlation lengths in the x- and y-directions, which means their topography parameters have directional dependence. In particular, we demonstrate that spectral absorptance of Tungsten random rough surfaces at visible (VIS) and near-infrared (NIR) spectral regions are sensitive to correlation length and RMS height variations. Our results indicate that by optimizing random rough surface parameters, absorption values exceeding 95% can be obtained. Moreover, our results indicate that anisotropic random rough surfaces broaden the bandwidth of the high absorption region. It is shown that in VIS and NIR regions, the absorption enhancements of up to 47% and 52% are achieved for the isotropic and anisotropic rough surfaces, respectively.

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Yin, Y., Y. Pan, L. X. Hang, D. R. McKenzie e M. M. M. Bilek. "Direct current reactive sputtering Cr–Cr2O3 cermet solar selective surfaces for solar hot water applications". Thin Solid Films 517, n. 5 (gennaio 2009): 1601–6. http://dx.doi.org/10.1016/j.tsf.2008.09.082.

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Bogatu, Cristina, Cristina Cazan, Ileana Manciulea e Anca Duta. "Corrosion Resistance in Saline Environment of Colored Based Alumina Spectrally Selective Surfaces". Solid State Phenomena 227 (gennaio 2015): 103–6. http://dx.doi.org/10.4028/www.scientific.net/ssp.227.103.

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The paper presents the results on accelerated corrosion/erosion tests, of Thickness Insensitive Spectrally Selective paints, based on alumina matrix infiltrated with inorganic oxide pigments used in the solar-thermal energy conversion. The mechanism of the corrosion/erosion process is presented and discussed based on the polarization Tafel curves obtained in NaCl 3.5% solution. Optical properties (solar absorptance and thermal emittance) were measured before and after the corrosion tests and the results were correlated with the sample’s morphologies and the corrosion parameters. The influence of the antireflection layer on the corrosion resistance and spectral selectivity is also discussed.

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Ma, Wei, Yang Li, Christopher Y. H. Chao, Chi Yan Tso, Baoling Huang, Weihong Li e Shuhuai Yao. "Solar-assisted icephobicity down to −60°C with superhydrophobic selective surfaces". Cell Reports Physical Science 2, n. 3 (marzo 2021): 100384. http://dx.doi.org/10.1016/j.xcrp.2021.100384.

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Mwamburi, Mghendi, Ewa Wäckelgård e Arne Roos. "Preparation and characterisation of solar selective SnOx:F coated aluminium reflector surfaces". Thin Solid Films 374, n. 1 (ottobre 2000): 1–9. http://dx.doi.org/10.1016/s0040-6090(00)01045-2.

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Avila G., A. "Cobalt oxide films for solar selective surfaces, obtained by spray pyrolisis". Solar Energy Materials and Solar Cells 82, n. 1-2 (1 maggio 2004): 269–78. http://dx.doi.org/10.1016/j.solmat.2004.01.024.

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Hutchins, M. G., P. J. Wright e P. D. Grebenik. "Comparison of different forms of black cobalt selective solar absorber surfaces". Solar Energy Materials 16, n. 1-3 (agosto 1987): 113–31. http://dx.doi.org/10.1016/0165-1633(87)90013-x.

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Yanbin, Huang, Yin Zhiqiang e Shi Yueyan. "Optical properties of multilayer stack models for solar selective absorbing surfaces". Renewable Energy 8, n. 1-4 (maggio 1996): 559–61. http://dx.doi.org/10.1016/0960-1481(96)88918-x.

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Si, Xiu Li, Shao Long Wu, Bo Yang, Guo An Cheng e Rui Ting Zheng. "Numerical Simulations of Optical Absorption and Spectral Selective of Ni Nanowire/AAO Composites". Key Engineering Materials 602-603 (marzo 2014): 975–79. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.975.

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Spectral selectivity absorber is a key component in the solar collectors, which absorbs solar energy and converts it to thermal energy by heating liquid water. Metal nanowire arrays (NWAs) have potential to be used as solar collector because of good optical absorption in the visible region. In the paper, we use finite-difference time-domain (FDTD) solutions to calculate the optical absorption and spectral selectivity of nickel (Ni) NWA/AAO composites. By changing the length (L), fill-factor (FF), and surface roughness, we simulate the optical absorption and the spectral selectivity in terms of structural parameters of Ni NWA/AAO composites. Results demonstrate that Ni NWA/AAO composites with the length of 2 μm and the fill-factor of 0.13 (the diameter is 0.04 μm) have good optical absorption and spectral selectivity,and rough surfaces is better for higher conversion efficiency of Ni NWA/AAO composites.

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Fan, Z., J. Yang, J. N. Ding e N. Y. Yuan. "Influence of microstructured substrate on solar selective absorbing films". Surface Engineering 29, n. 6 (luglio 2013): 484–88. http://dx.doi.org/10.1179/1743294413y.0000000143.

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Bacelis-Martínez, Reyna Dianela, Dallely Melissa Herrera-Zamora, Manuel Ávila Santos, Octavio García-Valladares, Adriana Paola Franco-Bacca, Geonel Rodríguez-Gattorno e Miguel Ángel Ruiz-Gómez. "Enhanced Performance of Nickel–Cobalt Oxides as Selective Coatings for Flat-Plate Solar Thermal Collector Applications". Coatings 13, n. 8 (28 luglio 2023): 1329. http://dx.doi.org/10.3390/coatings13081329.

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Solar thermal collectors represent a practical option to capture energy from the sun, providing low-cost domestic and industrial heating and decreasing the dependency on fossil fuels. Spinel-type metal oxides show interesting physicochemical properties and so can be used as active materials for converting solar energy to electrical, chemical, and heat energy. We report the synthesis and characterization of nickel–cobalt mixed metal oxides used as an active phase in selective paints for solar absorber coatings applied to a domestic flat collector. The nickel–cobalt mixed oxides crystallized in the cubic phase related to the spinel structure, exhibiting good thermal stability and reproducibility. These mixed oxides presented oxidation states (2+ and 3+) for both nickel and cobalt. The coatings fabricated from the selective paints based on nickel–cobalt mixed oxides showed a solar absorptance value of 94%, while for the commercial paint Solkote®, the value was 93%. A representative coating based on the NiCo2O4 composition was evaluated for the first time in a domestic-type flat solar collector for water heating under real operating conditions, achieving an outstanding performance that competes with that of commercial collectors. The potential application of nickel–cobalt mixed oxides in solar collectors opens up new opportunities for future innovations and developments in functional absorber coatings.

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37

Katzen, Dahn, Esthy Levy e Yitzhak Mastai. "Thin films of silica–carbon nanocomposites for selective solar absorbers". Applied Surface Science 248, n. 1-4 (luglio 2005): 514–17. http://dx.doi.org/10.1016/j.apsusc.2005.03.037.

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38

Yin, Y., e R. E. Collins. "Optimization and analysis of solar selective surfaces with continuous and multilayer profiles". Journal of Applied Physics 77, n. 12 (15 giugno 1995): 6485–91. http://dx.doi.org/10.1063/1.359124.

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39

Fuente, Raquel, Telmo Echániz, Iñigo González de Arrieta, Irene Urcelay-Olabarria, Josu M. Igartua, Manuel J. Tello e Gabriel A. López. "High accuracy infrared emissivity between 50 and 1000 ᵒC for solar materials characterization". MATEC Web of Conferences 307 (2020): 01043. http://dx.doi.org/10.1051/matecconf/202030701043.

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The total hemispherical emissivity of materials used in the solar energy industry is a critical parameter in the calculation of the radiative thermal losses and material efficiency, especially in solar thermal collector absorbing surfaces. This is because the radiative heat losses have a significant economic impact on the final cost of the electricity produced in solar plants. Our laboratory, HAIRL, in the University of the Basque Country (UPV/EHU) in Spain [1] is the first to have published infrared spectral emissivity measurements in Solar Absorber Surfaces (SAS) at working temperature [2]. The laboratory allows measuring between 50 and 1000 ºC in the 0.83-25 μm range and is also capable of doing directional measurements at different angles between 0 and 80 degrees. Therefore, it is suitable for measuring solar selective coatings, for studying high temperature stability and for characterizing thermal energy harvesting materials. In this presentation, we show the specifications of our laboratory, the results of spectral emissivity measurements in air-resistant solar selective coatings and in eutectic alloys for thermal storage and we demonstrate the necessity of measuring at working temperature in order to possess reliable data.

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40

Hu, Mingke, Gang Pei, Lei Li, Renchun Zheng, Junfei Li e Jie Ji. "Theoretical and Experimental Study of Spectral Selectivity Surface for Both Solar Heating and Radiative Cooling". International Journal of Photoenergy 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/807875.

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A spectral selectivity surface for both solar heating and radiative cooling was proposed. It has a high spectral absorptivity (emissivity) in the solar radiation band and atmospheric window band (i.e., 0.2~3 μm and 8~13 μm), as well as a low absorptivity (emissivity) in other bands aside from the solar radiation and atmospheric window wavelengths (i.e., 3~8 μm or above 13 μm). A type of composite surface sample was trial-manufactured combining titanium-based solar selective absorbing coating with polyethylene terephthalate (TPET). Sample tests showed that the TPET composite surface has clear spectral selectivity in the spectra of solar heating and radiation cooling wavelengths. The equilibrium temperatures of the TPET surface under different sky conditions or different inclination angles of surface were tested at both day and night. Numerical analysis and comparisons among the TPET composite surface and three other typical surfaces were also performed. These comparisons indicated that the TPET composite surface had a relative heat efficiency of 76.8% of that of the conventional solar heating surface and a relative temperature difference of 75.0% of that of the conventional radiative cooling surface, with little difference in cooling power.

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41

Subasri, R., K. R. C. Soma Raju, D. S. Reddy, Neha Y. Hebalkar e G. Padmanabham. "Sol–gel derived solar selective coatings on SS 321 substrates for solar thermal applications". Thin Solid Films 598 (gennaio 2016): 46–53. http://dx.doi.org/10.1016/j.tsf.2015.12.002.

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42

Rahman, M. Mahbubur, Zhong-Tao Jiang, Paul Munroe, Lee Siang Chuah, Zhi-feng Zhou, Zonghan Xie, Chun Yang Yin et al. "Chemical bonding states and solar selective characteristics of unbalanced magnetron sputtered TixM1−x−yNy films". RSC Advances 6, n. 43 (2016): 36373–83. http://dx.doi.org/10.1039/c6ra02550a.

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Transition metal nitride Ti_xM_1−x−yN_y (M = Al or AlSi) based thin films are evaluated as solar selective surfaces by correlating their spectral selective features with their crystal structure and chemical bonding state including mechanical strength.

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43

Shim, Ji-Myung, Hyun-Woo Lee, Kyeong-Yeon Cho, Jae-Keun Seo, Ji-Soo Kim, Eun-Joo Lee, Jun-Young Choi et al. "17.6% Conversion Efficiency Multicrystalline Silicon Solar Cells Using the Reactive Ion Etching with the Damage Removal Etching". International Journal of Photoenergy 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/248182.

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For lower reflectance, we applied a maskless plasma texturing technique using reactive ion etching (RIE) on acidic-textured multicrystalline silicon (mc-Si) wafer. RIE texturing had a deep and narrow textured surface and showed excellent low reflectance. Due to plasma-induced damage, unless the RIE-textured surfaces have the proper damage removal etching (DRE), they have a drop inVocand FF. RIE texturing with a proper DRE had sufficiently higher short circuit current(Isc)than acidic-textured samples without a drop in open circuit voltage(Voc). And in order to improve efficiency of mc-Si solar cell, we applied RIE texturing with optimized DRE condition to selective emitter structure. In comparison with the acidic-textured solar cells, RIE-textured solar cells have above 200 mA absolute gain in Isc. And optimized RIE samples with a DRE by HNO3/HF mixture showed 17.6% conversion efficiency, which were made using an industrial screen printing process with selective emitter structure.

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44

Niranjan, K., Paruchuri Kondaiah, Arup Biswas, V. Praveen Kumar, G. Srinivas e Harish C. Barshilia. "Spectrally Selective Solar Absorber Coating of W/WAlSiN/SiON/SiO2 with Enhanced Absorption through Gradation of Optical Constants: Validation by Simulation". Coatings 11, n. 3 (15 marzo 2021): 334. http://dx.doi.org/10.3390/coatings11030334.

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The properties of spectrally selective solar absorber coatings can be fine-tuned by varying the thickness and composition of the individual layers. We have deposited individual layers of WAlSiN, SiON, and SiO2 of thicknesses ~940, 445, and 400 nm, respectively, for measuring the refractive indices and extinction coefficients using spectroscopic ellipsometer measurements. Appropriate dispersion models were used for curve fitting of Ψ and Δ for individual and multilayer stacks in obtaining the optical constants. The W/WAlSiN/SiON/SiO2 solar absorber exhibits a high solar absorptance of 0.955 and low thermal emissivity of 0.10. The refractive indices and extinction coefficients of different layers in the multilayer stack decrease from the substrate to the top anti-reflection layer. The graded refractive index of the individual layers in the multilayer stack enhances the solar absorption. In the tandem absorber, WAlSiN is the main absorbing layer, whereas SiON and SiO2 act as anti-reflection layers. A commercial simulation tool was used to generate the theoretical reflectance spectra using the optical constants are in well accordance with the experimental data. We have attempted to understand the gradation in refractive indices of the multilayer stack and the physics behind it by computational simulation method in explaining the achieved optical properties. In brief, the novelty of the present work is in designing the solar absorber coating based on computational simulation and ellipsometry measurements of individual layers and multilayer stack in achieving a high solar selectivity. The superior optical properties of W/WAlSiN/SiON/SiO2 makes it a potential candidate for spectrally selective solar absorber coatings.

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Fu, Rong, Xiaofeng Wu, Xingli Wang, Wei Ma, Long Yuan, Lu Gao, Keke Huang e Shouhua Feng. "Low-temperature hydrothermal fabrication of Fe3O4 nanostructured solar selective absorption films". Applied Surface Science 458 (novembre 2018): 629–37. http://dx.doi.org/10.1016/j.apsusc.2018.07.063.

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46

Nama Manjunatha, Krishna, e Shashi Paul. "Carrier selective metal-oxides for self-doped silicon nanowire solar cells". Applied Surface Science 492 (ottobre 2019): 856–61. http://dx.doi.org/10.1016/j.apsusc.2019.06.286.

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47

Merino, M. Celeste Gardey, M. Emilia Fernández de Rapp, Mónica Pinto, M. Elisa Etchechoury, M. Silvina Lassa, J. Miguel Martín Martínez, Gustavo E. Lascalea e Patricia G. Vázquez. "Combustion Synthesis of Ultrafine Powders of Co3O4 for Selective Surfaces of Solar Collectors". Procedia Materials Science 9 (2015): 230–38. http://dx.doi.org/10.1016/j.mspro.2015.04.029.

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48

Jäger, Ulrich, S. Mack, C. Wufka, A. Wolf, D. Biro e R. Preu. "Benefit of Selective Emitters for p-Type Silicon Solar Cells With Passivated Surfaces". IEEE Journal of Photovoltaics 3, n. 2 (aprile 2013): 621–27. http://dx.doi.org/10.1109/jphotov.2012.2230685.

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49

Mwamburi, Mghendi, Ewa Wäckelgård, Arne Roos e Rogath Kivaisi. "Polarization-dependent angular-optical reflectance in solar-selective SnO_x:F/Al_2O_3/Al reflector surfaces". Applied Optics 41, n. 13 (1 maggio 2002): 2428. http://dx.doi.org/10.1364/ao.41.002428.

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50

Pinho, Diego Caitano, Francisco Nivaldo Aguiar Freire, Felipe Alves Albuquerque Araújo, Kaio Hemerson Dutra, Edwalder Silva Teixeira, Maria Eugênia Vieira da Silva e Paulo Alexandre Costa Rocha. "Characterization and application of a selective coating for solar collectors from of the cashew nut shell liquid". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 234, n. 1 (16 ottobre 2019): 167–74. http://dx.doi.org/10.1177/1464420719880935.

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Solar energy is the most promising energy source, due to its great availability and applicability in thermal energy applications. However, researchers still experience technological and economical challenge, since many systems that use this energy still have low efficiency and high cost. In this way, the development of new materials and technologies to increase the efficiency of solar thermal collectors is both a challenge and a necessity. In this context, the objective of this work is to obtain and analyze selective surfaces for solar thermal collectors, using cashew nut shell liquid. The cashew nut shell liquid can be classified as technical or natural, depending on the mode of extraction of cashew liquid. An experimental bench was built to simulate a flat plate solar collector under real operating conditions. For comparative purposes, the tests were performed between the cashew nut shell liquid and the commercial surface (MRTiNOX). In order to verify the structure morphology and the chemical composition of the surface, analyzes were performed by scanning electron microscopy. In order to identify the presence of components after the sintering process, the infrared analysis technique was used. To analyze the surface absorbance, the ultraviolet–visible spectroscopy absorbance technique was used. With the tests in real conditions, it was possible to perform the temperature measurements, and later, with the energy balance, the absorptivity, emissivity, and efficiency were calculated. The technical cashew nut shell liquid presented efficiency of 42.86%, while the MRTiNOX, 41.8%. In contrast, natural cashew nut shell liquid obtained efficiency of 31.28%. Thus, the use of technical cashew nut shell liquid, a low-cost regional product, was presented as a viable and satisfactory solution for cost reduction in solar thermal collectors.

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