Relevant bibliographies by topics / Solar absorptivity

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Solar absorptivity'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Solar absorptivity"

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Hernandez, D., D. Antoine, G. Olalde, and J. M. Gineste. "Optical Fiber Reflectometer Coupled With a Solar Concentrator to Determine Solar Reflectivity and Absorptivity at High Temperature." Journal of Solar Energy Engineering 121, no. 1 (February 1, 1999): 31–35. http://dx.doi.org/10.1115/1.2888139.

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Devices and methods are presented in which an optical fiber reflectometer and a solar concentrator are used to determine solar reflectivity and absorptivity for opaque and diffuse materials. The measurements can be taken at high temperature, the final aim is to reach 2500°C. Firstly we will present the specific reflectometer and its measurement principles. We will then describe the whole experimental hardware (solar concentrator, associated devices) and the method used to determine solar reflectivity and absorptivity. Finally, we will present examples of results obtained on a metallic sample.
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Fan, Desong, Qiang Li, and Yimin Xuan. "Tailoring the solar absorptivity of thermochromic material." Journal of Quantitative Spectroscopy and Radiative Transfer 112, no. 18 (December 2011): 2794–800. http://dx.doi.org/10.1016/j.jqsrt.2011.08.007.

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Family, Roxana, and M. Mengüç. "Analysis of Sustainable Materials for Radiative Cooling Potential of Building Surfaces." Sustainability 10, no. 9 (August 28, 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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He, Song, Yanmei Zhang, Wansheng Yang, Zhangyuan Wang, Xudong Zhao, and Pingnuo Wang. "Investigation on the Solar Absorption Property of the Nanoporous Alumina Sheet for Solar Application." Materials 12, no. 14 (July 22, 2019): 2329. http://dx.doi.org/10.3390/ma12142329.

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In order to improve the absorption performance of the aluminum sheet for solar application, the nanoporous alumina sheets with the pore diameters of 30 nm and 400 nm were prepared by the anodic oxidation method. The absorption properties of the nanoporous alumina sheets under different solar radiation intensity were studied and compared with the conventional polished aluminum sheet. The results showed that the average absorptivity of the aluminum sheets decreased with the increase of the radiation intensity. When the radiation intensity was 100 W/m2, the nanoporous alumina sheet with the 30 nm pore diameter had the highest average solar absorptivity of 0.39, which was 18% higher than that of the nanoporous alumina sheet with 400 nm pore diameter, and 50% higher than that of the polished aluminum sheet. The maximum instantaneous absorption efficiency of the nanoporous alumina sheet with 30 nm pore diameter was found at 0.92 when the radiation intensity was 100 W/m2. The testing results indicated that the nanoporous alumina sheet with the 30 nm pore diameter performed the best compared with the other two aluminum sheets. By error propagation analysis, the relative error of the average amount of heat absorption and the average absorptivity were acceptable.
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Trupke, T. "Absorptivity of silicon solar cells obtained from luminescence." Solar Energy Materials and Solar Cells 53, no. 1-2 (May 12, 1998): 103–14. http://dx.doi.org/10.1016/s0927-0248(98)00016-6.

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Gong, Mi Mi, Xiang Rui Meng, Xin Ling Ma, and Xin Li Wei. "Economic Analysis of Solar Wall System in Northern China Heating Region." Advanced Materials Research 347-353 (October 2011): 241–45. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.241.

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The economic feasibility of solar wall system was assessed with RETScreen software for 15 widespread locations in northern China heating region. Several different economic and financial indicators were calculated, such as the internal rate of return, net present value, simple payback and benefit-cost ratio. Results showed that the solar wall system was only profitable for four sites according to the current domestic price of solar wall plate and its absorptivity. When the price was reduced or the absorptivity under the condition of invariable price was improved, there were more sites profitable for this system. So, only when the price of energy increases 95% or the price of solar wall plate falls 50%, the solar wall system will be profitable for all sites in northern China heating region.
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Mrňa, Libor, Jan Řiháček, Martin Šarbort, and Petr Horník. "SOLAR ABSORBER WITH A STRUCTURED SURFACE – A WAY TO INCREASE EFFICIENCY." Acta Polytechnica 59, no. 2 (April 30, 2019): 134–43. http://dx.doi.org/10.14311/ap.2019.59.0134.

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The basic idea of a solar absorber’s thermal gain increase is the keyhole effect utilization during which the radiation is absorbed by multiple reflections on cavity walls. The lattice of pyramidal or conical cavities on the solar absorber surface can be formed to create a structured surface leading to its overall absorptivity increase and to a reduction of the surface absorptivity dependence on the solar radiation incident beam angle changes caused by the daily and annual solar cycles. This contribution concludes the results of simulations of the effect of cavity geometry, geographical position and absorber orientation on its thermal gain with respect to the technological manufacturability of cavities. Furthermore, the real construction of the absorber with a structured surface using laser welding and parallel hydroforming is briefly described.
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Feng, Chi, Chen Chen Wu, and Qing Lin Meng. "Experimental Study on the Radiative Properties of a Sedum lineare Greenroof." Applied Mechanics and Materials 174-177 (May 2012): 1986–89. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.1986.

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Greenroofs are increasingly popular throughout the world. Radiative properties of greenroofs are important for the analysis and enhancement of their thermal performance. The radiative properties of a typical Sedum lineare greenroof were studied in this paper. Experimental results revealed that the solar radiation absorptivity, longwave radiation absorptivity and emissivity of this Sedum lineare greenroof were 0.84, 1.0 and 1.0 respectively.
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Wang, Cong, Xin Kang Du, and Tian Min Wang. "Nb-NbN Cermet Film as Solar Selective Coating." Advanced Materials Research 26-28 (October 2007): 899–904. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.899.

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A new cermet film Nb-NbN, deposited on the stainless steel substrate by direct reactive magnetron sputtering, was reported as solar selective absorptive coating. Some fundamental studies on microstructure and optical properties of the Nb-NbN cermet films were carried out by XRD, EDX, SEM and spectrophotometer. A solar absorptivity of 0.94 and a normal emissivity of 0.16 at room temperature were achieved for the coating. Thermal stability was investigated at 350°C and 500°C and it was observed that the absorptivity was changed in a range from 0.92 to 0.94 and the surface emissivity varied firstly from 0.16 to 0.14 and then increasing to 0.19 when the temperature was increased from room temperature to 350°C and up to 500°C.
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Yerudkar, Aditi, Mamta Nair, Vishwanath H. Dalvi, Sudhir V. Panse, Vineeta D. Deshpande, and Jyeshtharaj B. Joshi. "Development of inexpensive, simple and environment-friendly solar selective absorber using copper nanoparticle." International Journal of Chemical Reactor Engineering 19, no. 7 (February 10, 2021): 727–37. http://dx.doi.org/10.1515/ijcre-2020-0154.

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Abstract Concentrating solar power is the most challenging and expensive yet highly efficient source of thermal energy from solar power. This is mainly due to the intermittency of the sun rays and expensive materials used to harness its energy. One of the main components adding to the cost is the solar selective absorber materials which are simply put spectrally selective coatings on a receiver system to capture maximum heat from the sun. These materials add to a large extent to the efficiency of converting the sun’s energy to thermal energy and in turn electricity. An ideal solar selective absorber possesses the property of absorbing maximum radiations in the solar spectrum and emit minimum in the thermal energy spectrum. In the current study, an inexpensive, simple and environment-friendly solar selective absorber is fabricated by a galvanic displacement reaction of copper nanoparticles on galvanised metal substrates. These copper nanoparticles have high absorptivity (0.8–0.9) by virtue of plasmon resonance property. The emissivity is low due to the highly reflective metal substrate. By varying size of the copper nanoparticles from 100 nm to 2 μm emissivity and absorptivity can be varied. However, achieving low emissivity and high absorptivity requires some optimising. The size depends on the concentration of precursor solution and immersion time of substrate. One of the remedies for controlling the deposition rate to tune the nanoparticle size and microstructure of deposited copper nanoparticle is by addition of a deposition inhibitor (e.g. Polyethylene glycol).
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Dissertations / Theses on the topic "Solar absorptivity"

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Tambwe, Kevin. "P- and e- type Semiconductor layers optimization for efficient perovskite photovoltaics." University of Western Cape, 2019. http://hdl.handle.net/11394/7414.

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>Magister Scientiae - MSc
Perovskite solar cells have attracted a tremendous amount of research interest in the scientific community recently, owing to their remarkable performance reaching up to 22% power conversion efficiency (PCE) in merely 6 to 7 years of development. Numerous advantages such as reduced price of raw materials, ease of fabrication and so on, have contributed to their increased popularity.
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Vieira, Samuel Guerra. "ObtenÃÃo, caracterizaÃÃo e aplicaÃÃo de uma nova superfÃcie Seletiva para coletores solares tÃrmicos." Universidade Federal do CearÃ, 2011. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6923.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico
O estudo de superfÃcies seletivas para coletores solares tÃrmicos, hà alguns anos, enfoca o uso de pastas e tintas para recobrir chapas de cobre ou alumÃnio, formando a placa absorvedora do coletor. Essas tintas ou pastas sÃo eletrodepositadas em placas metÃlicas, sendo este processo muitas vezes responsÃvel pelo levado custo de superfÃcies seletivas. O uso de compÃsitos obtidos a partir do Ãxido de cromo, Ãxido de ferro e Ãxido de titÃnio em um processo cerÃmico, utilizando a tÃcnica de deposiÃÃo por screen-printing pode ser uma alternativa para a obtenÃÃo de novas superfÃcies seletivas que tenham eficiÃncia prÃxima Ãs tintas e pastas jà comercializadas e com baixo custo de fabricaÃÃo. O objetivo deste trabalho à obter e caracterizar superfÃcies seletivas à base de cromo, ferro e titÃnio e comparÃ-las com outras superfÃcies jà comercializadas (Ãxidos metÃlicos), encontrar os valores da absortividade e caracterizar as mesmas por espectroscopÃa raman e infavermelho.
The study of selective coating for thermal solar collectors has been carried out with focus on the use of selective paints and coatings for copper and aluminum plates, which are used to manufacture the absorber plate. The processes, such as electrodeposition, used in these paints and coatings are expensive and they increasing the price of the final product. The use of composite obtained from chromium oxide, iron oxide, and titanium oxide in a ceramic process using the screen-printing deposition technique is an alternative to develop new selective coating with approximately the same thermal efficiency, but at a lower cost than the commercial ones. The results show that the absorptivity values measured with the new coatings are close to those presented by the manufacturers in the commercial sufaces. The objective is to obtain and characterize selective surfaces based on chromium, iron and titanium and compares them to other areas already marketed (metal oxides), find the values of absorptivity and characterize them by raman and infrared spectroscopy.
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Brodu, Etienne. "Thermal radiative properties and behavior of refractory metals, highly textured metallic coatings and pyrolytic boron nitride on C/C composite for the Solar Probe Plus mission." Thesis, Perpignan, 2014. http://www.theses.fr/2014PERP1203.

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Les travaux menés durant cette thèse s’inscrivent dans le cadre du développement de la mission spatiale Solar Probe Plus (NASA). Cette sonde d’exploration, dont la vocation est l’étude du Soleil, pénétrera la couronne solaire pour y faire des mesures in-situ. Ce travail de thèse a consisté à mener l’étude expérimentale des matériaux constitutifs de la sonde: métaux réfractaires (W, Re, Ta, Mo, Nb, Ti), composite C/C, un revêtement de nitrure de bore pyrolytique (pBN) ainsi que des dépôts métalliques texturés à forte émissivité. L’environnement à l’approche du soleil fut reproduit expérimentalement au sol au laboratoire PROMES-CNRS en associant le four solaire d’1 MW à Odeillo au moyen d’essai MEDIASE (Moyen d’Essai et de Diagnostic en Ambiance Spatiale Extrême). Grâce à ces moyens expérimentaux, ces matériaux candidats ont pu être testés sous formes d’échantillons, à très haute température (1100-2500 K), sous vide (10-4 Pa), ainsi que sous bombardement de protons (1-4 keV, jusqu'à 1018 ions m-2 s-1, pour la simulation du vent solaire). La propriété matériau sur laquelle cette étude expérimentale s’est concentrée est l’émissivité, dans la mesure où celle-ci va conditionner la température des surfaces de la sonde faisant face au Soleil. Celle-ci a été mesurée in-situ dans MEDIASE pendant les différents traitements. Dans le cadre de l’étude des métaux réfractaires, il a s’agit de comprendre la relation entre état de surface et émissivité, ainsi que d’étudier les modifications induites par les traitements. En ce qui concerne les dépôts métalliques texturés ainsi que le dépôt de pBN, leur étude a consisté à évaluer leurs performances radiatives et leurs comportements à haute température
Solar Probe Plus (NASA) will be a historic mission of space exploration as it will consist in the first spacecraft to enter the solar corona. The spacecraft will face harsh environmental conditions that no other spacecraft has ever encountered in the past. One of the most critical technology developments for this mission is thus material science related: the materials constituting all the surfaces directly facing the Sun must be studied and tested in a relevant environment. The study of the candidate materials has been carried out at PROMES-CNRS: refractory metals for the instruments (W, Re, Ta, Mo, Nb, Ti, and their alloys), and refractory ceramics for the thermal protection shield (C/C composite and pyrolytic boron nitride - pBN). Samples of these materials were tested experimentally in a simulated near-Sun environment. This environment was simulated on ground thanks to the association of the 1 MW solar furnace in Odeillo, to the MEDIASE facility. This way materials were tested at very high temperature (1100-2500 K) in high vacuum (10-4 Pa), with the solar wind being reproduced via a proton bombardment (1-4 keV, up to 1018 ions m-2 s-1). The material properties that we have studied the most are the thermal radiative properties as they fully determine the temperature of a free-standing surface exposed to an intense radiative flux in vacuum. For refractory metals, it mainly consisted in studying the relationship between surface state and radiative properties, as well as the effect of the treatments. As for the textured metallic coatings and pBN, it consisted mainly in determining their efficiencies and understanding their behaviors
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Book chapters on the topic "Solar absorptivity"

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Bopche, Santosh B. "Effect of Reflector Absorptivity on Radiative Heat Exchange in Case of Solar Receiver Collection Systems." In Applications of Solar Energy, 29–55. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7206-2_3.

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Penney, William Roy, Kendal J. Brown, Joel D. Vincent, and Edgar C. Clausen. "Solar Flux and Absorptivity Measurements *." In Fluid Mechanics and Heat Transfer, 167–77. CRC Press, 2018. http://dx.doi.org/10.1201/9781351242332-16.

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Conference papers on the topic "Solar absorptivity"

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Granier, Christopher H., Francis O. Afzal, Georgios Veronis, and Jonathan P. Dowling. "Multilayer structures with highly directional absorptivity for solar thermophotovoltaics." In SPIE Solar Energy + Technology, edited by Oleg V. Sulima and Gavin Conibeer. SPIE, 2013. http://dx.doi.org/10.1117/12.2024773.

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Fang, Xing, C. Y. Zhao, and Hua Bao. "Study on a Novel Selective Solar Absorber With Surface Ultrathin Metal Film." In ASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/mnhmt2016-6584.

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In this paper, simple selective solar absorbers with three layers are investigated, and their selective absorptivity spectra are quite appropriate for high performance solar absorbers. The simple solar absorber contains top ultrathin tungsten (W) layer, middle silica layers and W substrate. The thickness of silica can determine the location of absorptivity peak while the thickness of top W layer affects the intensity of absorptivity. Considering the total conversion efficiency, optimized thicknesses in solar absorbers are determined by genetic algorithm. This optimized thin film solar absorber keeps high absorptivities when incident direction varies from 0 degree to 60 degree in both TE and TM polarizations. Experiments validate the effectivity of thin film solar absorbers, and the deviation from simulations comes from increscent refractive index and surface non-uniform.
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Wang, Hao, Jiaqi Chen, P. N. Balaguru, and Leith Al-Nazer. "Low Solar Absorption Coating for Reducing Rail Temperature." In 2014 Joint Rail Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/jrc2014-3819.

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The feasibility of using low-solar-absorption coatings to reduce the temperature rise of rails in summer is investigated in this paper using numerical analysis. Finite element (FE) models were developed based on the theory of heat transfer for predicting temperature fields in the rail track structure. Field measurements of air temperature and rail temperature were used to verify the modeled temperatures. Analysis results show that the developed FE models provide reasonable predictions of rail temperature. The 3-D rail temperature field shows that rail temperature differs spatially in the natural environment, which indicates that the current average temperature models may not provide accurate prediction of peak rail temperature. The peak temperature was observed at the top of rail seated on the wood ties. The developed FE models were further used to analyze the influence of solar absorptivity and emissivity of coating materials on rail temperature. Decreasing the absorptivity and increasing the emissivity of rail surface may decrease the peak rail temperature at different levels. The effect of decreased absorptivity was found to be more significant. This indicates that when an engineered coating material is applied on rail side surfaces, the peak rail temperature can be decreased significantly, which provides an alternative solution to reduce rail buckling risk without decreasing train speed or increasing the laydown temperature of rail. The experimental investigation of the effect of low solar absorption coating on rail temperature is ongoing.
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Özkökdemir, Emir, Berkay Filiz, and Yener Usul. "A Novel Fast Predicting Technique for the Absorptivity of Surface Coating." In ASME 2021 Heat Transfer Summer Conference collocated with the ASME 2021 15th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/ht2021-61956.

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Abstract The most common technique for a surface to have the desired thermo-physical properties or to reflect the desired optical properties is the surface coating. It is used in a wide application area from under the seas to the depths of space. In order for a surface coating to be used, it must have well-defined thermo-physical properties. These properties could be properties that are directly dependent on the material such as heat capacity, heat transfer coefficient and thermal expansion coefficient, as well as material and surface-dependent properties such as absorptivity, reflectivity and transmissivity. Absorptivity is a very important parameter for thermal management of electronics operating under direct solar radiation. Optical methods used to measure the absorptivity are expensive and time consuming methods. In this study, obtaining the absorptivity value of a surface coating with a fast and inexpensive method is investigated. The method consists of two stages; experiment and conduction-based finite element simulation. An aluminum plate with the surface coating to be measured and an aluminum plate with well-known thermo-physical properties without any surface coating are tested in the same environment condition (wind, solar radiation etc.). In the experiment, the time-dependent temperature measurement is taken on both plates separately. Also direct solar radiation and wind speed measurement from the environment are taken. Using these measurements, the FE model is validated and the experiment condition is simulated. The absorptivity of the surface coating is obtained with the iterative solutions made as a result of the analysis test verification studies. The iterative results are presented comparatively with the maximum percent error between simulation and experiment. Consequently, unlike the known methods, the material absorptivity could be measured with a very simple, time efficient and cheap method.
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Hammonds, James S., Kimani A. Stancil, and Olalekan S. Adewuyi. "Selective Infrared Energy Harvesting by Nanoparticle Dispersions in Solar Thermal Desalination Systems." In ASME 2020 14th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/es2020-1654.

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Abstract A significant portion of the infrared solar spectrum is either unused, or wasted by inefficient solar energy conversion. In this paper, we show that infrared light harvesting can also be accomplished by dispersions of polar nanoparticles. Polar nanoparticle dispersions in a selective absorber may result in Solar Thermal Desalination (STD) systems that aim to maximize the solar-to-heat conversion efficiency by managing the thermal radiative and conduction losses. In noting that irregular dispersions of polar nanoparticles are less costly than regularly spaced nanostructures to manufacture at large scales, we describe the solar absorptivity as a function of a nanoparticle chain model determined emissivity and thermal conductance. The near-field interactions between nanoparticles are explained by modeling the nanoparticles as dispersed electromagnetic dipole oscillations that interact with solar light. An FDTD model of polar nanodispersions near an optical cavity is used to demonstrate infrared harvesting. With this model, we show that the infrared light-harvesting mechanisms of silica nanoparticles involve local and propagating surface phonon polaritons and varying the volume fraction changes radiation transport properties by several orders of magnitude. In discussing STD systems, we demonstrate a potential to use nanoparticle chains to create novel selective absorbers with tunable solar absorptivity.
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Al-Azawie, S. S., S. Hassan, and M. F. Zammeri. "Experimental and numerical study on ground material absorptivity for solar chimney power applications." In ENERGY AND SUSTAINABILITY 2014. Southampton, UK: WIT Press, 2014. http://dx.doi.org/10.2495/esus140191.

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Kra¨upl, Stefan, and Aldo Steinfeld. "Monte Carlo Radiative Transfer Modeling of a Solar Chemical Reactor for the Co-Production of Zinc and Syngas." In ASME 2004 International Solar Energy Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/isec2004-65035.

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Radiation heat transfer within a solar chemical reactor for the co-production of zinc and syngas is analyzed by the Monte Carlo ray-tracing method. The reactor is treated as a 3D non-isothermal cavity-receiver lined with ZnO particles that are directly exposed to concentrated solar irradiation and undergo endothermic reduction by CH4 at above 1300 K. The analysis includes coupling to conduction/convection heat transfer and chemical kinetics. Calculation of the apparent absorptivity indicates the cavity’s approach to a blackbody absorber, for either diffuse or specular reflecting inner walls. Numerically calculated temperature distributions, zinc production rates, and thermal efficiencies are validated with experimental measurements in a solar furnace with a 5-kW prototype reactor. At 1600 K, the zinc production rate reached 0.12 mol/min and the reactor’s thermal efficiency exceeded 16%. Scaling up the reactor to power levels of up to 1 MW while keeping constant the relative geometrical dimensions and the solar power flux at 2000 suns results in thermal efficiencies of up to 54%.
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Hajimirza, Shima, and John R. Howell. "COMPUTATIONAL AND EXPERIMENTAL STUDY OF A MULTI-LAYER ABSORPTIVITY ENHANCED THIN FILM SILICON SOLAR CELL." In RAD-13. Proceedings of the 7th International Symposium on Radiative Transfer, June 2-8, 2013, Kusadasi, Turkey. Connecticut: Begellhouse, 2013. http://dx.doi.org/10.1615/ichmt.2013.intsympradtransf.200.

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Summers, Edward K., John H. Lienhard, and Syed M. Zubair. "Air-Heating Solar Collectors for Humidification-Dehumidification Desalination Systems." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23214.

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Relative to solar water heaters, solar air heaters have received relatively little investigation and have resulted in few commercial products. However, in the context of a Humidification-Dehumidification (HDH) Desalination cycle, air heating accounts for advantages in cycle performance. Solar collectors can be over 40% of an air-heated HDH system’s cost, thus design optimization is crucial. Best design practices and sensitivity to material properties for solar air heaters are investigated, and absorber solar absorptivity and glazing transmissivity are found to have the strongest effect on performance. Wind speed is also found to have an impact on performance. Additionally a well designed, and likely low cost, collector includes a double glazing and roughened absorber plates for superior heat transfer to the airstream. A collector in this configuration performs better than current collectors with an efficiency of 58% at a normalized gain of 0.06 K m2/W.
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Shimizu, Makoto, Kimio Takeuchi, Hitoshi Sai, Fumitada Iguchi, Noriko Sata, and Hiroo Yugami. "High-Temperature Solar Selective Absorber Material Using Surface Microcavity Structures." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54599.

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The spectral properties of thermal radiation can be controlled by surface microstructures with feature size in the optical wavelength range. We applied this technology to solar selective absorbers for concentrated solar power (CSP) generation systems. We investigated the spectral properties and thermal stability of two-dimensional periodic microstructures on a tungsten (W) surface to develop solar selective absorbers for high-temperature applications. The developed absorbers exhibited good spectral selectivity and sufficient thermal stability under vacuum. Although we could verified that the microstructured solar selective absorbers improved CSP efficiency, this method cannot be put into practical use because of cost and time, and also because there is currently no technology for fabricating surface gratings on high melting point materials over a large area. Therefore, we used W–Cu alloys to investigate an approach to mass production of surface microcavity structures over a large area. We then confirmed that the absorptivity in the visible light range could be increased by using this simple method.
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