The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Ghalya Pikra - One of the best experts on this subject based on the ideXlab platform.
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Absorber Layer Addition and Thermal Storage Media Comparison for Concentrated Solar Power Plant Optimization
Energy Procedia, 2020Co-Authors: Tinton Dwi Atmaja, Ghalya PikraAbstract:Abstract Electricity generation from concentrated Solar power plant can be optimized on its storage system or its receiver system. This paper conducts a review of how to optimize the concentrated Solar power plant by increasing the stored energy capacity or by stabilizing the absorptance and emittance in the Solar Absorber. The additional stages in the CSP may increase thermal efficiency. The stages consist of two oriented Solar Absorber to create superheated steam fed to the steam turbine and one regenerator to optimally regenerate heat for working fluid before pumped to Solar Absorber. A suitable treatment for superheated steam from Solar Absorber can optimally supply the turbine with a continually stable steam. The continuous stable steam can be controlled using steam accumulator right before the superheated steam fed into turbine. The thermal energy storage in the cycle can be optimally selected based on the stored energy capacity per kg of compared material used. The final modification was made using recently developed Absorber material of hafnium molybdenum nitride to create four layer tandem Absorber of HfMoN(H)/HfMoN(L)/HfON/Al2O3. The tandem Absorber indicates a stable absorptance and emittance up until 600 °C (in vacuum) and 525 °C (in air). The final configuration believed to enhance the thermal stability for high temperature concentrated Solar power plant application.
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Absorber layer addition and thermal storage media comparison for concentrated Solar power plant optimization
Energy Procedia, 2013Co-Authors: Tinton Dwi Atmaja, Ghalya PikraAbstract:Electricity generation from concentrated Solar power plant can be optimized on its storage system or its receiver system. This paper conducts a review of how to optimize the concentrated Solar power plant by increasing the stored energy capacity or by stabilizing the absorptance and emittance in the Solar Absorber. The additional stages in the CSP may increase thermal efficiency. The stages consist of two oriented Solar Absorber to create superheated steam fed to the steam turbine and one regenerator to optimally regenerate heat for working fluid before pumped to Solar Absorber. A suitable treatment for superheated steam from Solar Absorber can optimally supply the turbine with a continually stable steam. The continuous stable steam can be controlled using steam accumulator right before the superheated steam fed into turbine. The thermal energy storage in the cycle can be optimally selected based on the stored energy capacity per kg of compared material used. The final modification was made using recently developed Absorber material of hafnium molybdenum nitride to create four layer tandem Absorber of HfMoN(H)/HfMoN(L)/HfON/Al2O3. The tandem Absorber indicates a stable absorptance and emittance up until 600°C (in vacuum) and 525°C (in air). The final configuration believed to enhance the thermal stability for high temperature concentrated Solar power plant application. © 2013 The Authors. Published by Elsevier Ltd.
Pedro Gomezromero - One of the best experts on this subject based on the ideXlab platform.
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electrochemical deposition of black nickel Solar Absorber coatings on stainless steel aisi316l for thermal Solar cells
Solar Energy Materials and Solar Cells, 2005Co-Authors: Monica Liracantu, Alex Brustenga, Angel Morales Sabio, Pedro GomezromeroAbstract:Abstract We report the electrochemical deposition of nanostructured nickel-based Solar Absorber coatings on stainless steel AISI type 316L. A sol–gel silica-based antireflection coating, from TEOS, was also applied to the Solar surface by the dip-coating method. We report our initial results and analyze the influence of the stainless steel substrate on the final total reflectance properties of the Solar Absorber. The relation between surface morphology, observed by SEM and AFM, the composition of the electrodeposited surfaces analyzed by X-ray powder diffraction and the study of different electrodeposition conditions and silica sol–gel coatings is described. The best Solar absorptance and thermal emittance values obtained on stainless steel substrates were 0.91and 0.1, respectively.
Pedro Gómez-romero - One of the best experts on this subject based on the ideXlab platform.
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Electrochemical deposition of black nickel Solar Absorber coatings on stainless steel AISI316L for thermal Solar cells
Solar Energy Materials and Solar Cells, 2005Co-Authors: Monica Lira-cantu, Angel Morales Sabio, Alex Brustenga, Pedro Gómez-romeroAbstract:We report the electrochemical deposition of nanostructured nickel-based Solar Absorber coatings on stainless steel AISI type 316L. A sol-gel silica-based antireflection coating, from TEOS, was also applied to the Solar surface by the dip-coating method. We report our initial results and analyze the influence of the stainless steel substrate on the final total reflectance properties of the Solar Absorber. The relation between surface morphology, observed by SEM and AFM, the composition of the electrodeposited surfaces analyzed by X-ray powder diffraction and the study of different electrodeposition conditions and silica sol-gel coatings is described. The best Solar absorptance and thermal emittance values obtained on stainless steel substrates were 0.91and 0.1, respectively. © 2004 Elsevier B.V. All rights reserved.
Liping Wang - One of the best experts on this subject based on the ideXlab platform.
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Highly efficient selective metamaterial Absorber for high-temperature Solar thermal energy harvesting
Solar Energy Materials and Solar Cells, 2015Co-Authors: Hao Wang, Vijay Prasad Sivan, Patrick Phelan, Arnan Mitchell, Gary Rosengarten, Liping WangAbstract:In this work, a selective Solar Absorber made of nanostructured titanium gratings deposited on an ultrathin MgF2spacer and a tungsten ground film is proposed and experimentally demonstrated. Normal absorptance of the fabricated Solar Absorber is characterized to be higher than 0.9 in the UV, visible and, near infrared (IR) regime, while the mid-IR emittance is around 0.2. The high broadband absorption in the Solar spectrum is realized by the excitation of surface plasmon and magnetic polariton resonances, while the low mid-IR emittance is due to the highly reflective nature of the metallic components. Further directional and polarized reflectance measurements show wide-angle and polarization-insensitive high absorption within Solar spectrum. Temperature-dependent spectroscopic characterization indicates that the optical properties barely change at elevated temperatures up to 350 C. The Solar-to-heat conversion efficiency with the fabricated metamaterial Solar Absorber is predicted to be 78% at 100 C without optical concentration or 80% at 400 C with 25 suns. The performance could be further improved with better fabrication processes and geometric optimization during metamaterial design. The strong spectral selectivity, favorable diffuse-like behavior, and good thermal stability make the metamaterial selective Absorber promising for significantly enhancing Solar thermal energy harvesting in various systems at mid to high temperatures.
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highly efficient selective metamaterial Absorber for high temperature Solar thermal energy harvesting
arXiv: Materials Science, 2014Co-Authors: Hao Wang, Arnan Mitchell, Gary Rosengarten, Vijay Sivan, Patrick E Phelan, Liping WangAbstract:In this work, a metamaterial selective Solar Absorber made of nanostructured titanium gratings deposited on an ultrathin MgF2 spacer and a tungsten ground film is proposed and experimentally demonstrated. Normal absorptance of the fabricated Solar Absorber is characterized to be higher than 90% in the UV, visible and, near infrared (IR) regime, while the mid-IR emittance is around 20%. The high broadband absorption in the Solar spectrum is realized by the excitation of surface plasmon and magnetic polariton resonances, while the low mid-IR emittance is due to the highly reflective nature of the metallic components. Further directional and polarized reflectance measurements show wide-angle and polarization-insensitive high absorption within Solar spectrum. Temperature-dependent spectroscopic characterization indicates that the optical properties barely change at elevated temperatures up to 350{\deg}C. The Solar-to-heat conversion efficiency with the fabricated metamaterial Solar Absorber is predicted to be 78% at 100{\deg}C without optical concentration or 80% at 400{\deg}C with 25 suns, and could be further improved with better fabrication processes and geometric optimization during metamaterial design. The strong spectral selectivity, favorable diffuse-like behavior, and excellent thermal stability make the metamaterial selective Absorber promising for significantly enhancing Solar thermal energy harvesting in various system at mid to high temperatures.
Gabriel Olalde - One of the best experts on this subject based on the ideXlab platform.
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aging of Solar Absorber materials under highly concentrated Solar fluxes
Solar Energy Materials and Solar Cells, 2014Co-Authors: Antoine Boubault, Bernard Claudet, Olivier Faugeroux, Gabriel OlaldeAbstract:Abstract This article introduces an experimental approach to study the aging of Absorber materials used in the receivers of CSP power plants. The term ‘aging’ is discussed in the case of Solar Absorber materials and a definition is suggested. A two-layer material (metal+paint coating) that is commonly used in Solar tower receivers is studied. Accelerated aging tests are performed on this material with the Solar Accelerated Aging Facility (SAAF) available at PROMES laboratory (Odeillo, France). To evaluate the aging state of the samples after being Solar-treated, the thermoradiative and thermophysical properties that characterize the aging of the coating are estimated with two experimental devices. The results show the influence of the mean irradiance, amplitude, period, and exposure time of the radiative cycles on the estimated properties. The absorptance appears to be the most sensitive property causing the thermal performance to decrease. Particular attention should be paid to the application of the paint coating which needs to be vitrified carefully in order to obtain optimal and stable absorption properties.
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Aging of Solar Absorber materials under highly concentrated Solar fluxes
Solar Energy Materials and Solar Cells, 2014Co-Authors: Antoine Boubault, Bernard Claudet, Olivier Faugeroux, Gabriel OlaldeAbstract:This article introduces an experimental approach to study the aging of Absorber materials used in the receivers of CSP power plants. The term 'aging' is discussed in the case of Solar Absorber materials and a definition is suggested. A two-layer material (metal+paint coating) that is commonly used in Solar tower receivers is studied. Accelerated aging tests are performed on this material with the Solar Accelerated Aging Facility (SAAF) available at PROMES laboratory (Odeillo, France). To evaluate the aging state of the samples after being Solar-treated, the thermoradiative and thermophysical properties that characterize the aging of the coating are estimated with two experimental devices. The results show the influence of the mean irradiance, amplitude, period, and exposure time of the radiative cycles on the estimated properties. The absorptance appears to be the most sensitive property causing the thermal performance to decrease. Particular attention should be paid to the application of the paint coating which needs to be vitrified carefully in order to obtain optimal and stable absorption properties. ?? 2014 Elsevier B.V.
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Study of the aging of a Solar Absorber material following the evolution of its thermoradiative and thermophysical properties
High Temperatures - High Pressures, 2013Co-Authors: Antoine Boubault, Nathan Guerin, Bernard Claudet, Olivier Faugeroux, Gabriel OlaldeAbstract:Absorber materials used in concentrating Solar power systems are subjected to extreme conditions stich as high irradiation, high temperature and strong thermal shocks. These factors accelerate aging mechanisms that are responsible for the decrease of the material's thermal performance. To evaluate the service lifetime of Solar Absorber materials, some thermoradiative and thermophysieal properties need to be monitored. Our study focuses on a twolayer material (metal + black paint) that is commonly used in Solar power tower receivers. Two devices are described: a Solar optical fiber retlectometer allows estimating the normal Solar absorptance of the paint coating; an impulse photothermal method coupled with an inverse method algorithm allows estimating the thermal diffusivity. cffusivity. and conductivity of the coating, as well as the thermal contact resistance between the paint coating and the metal substrate. Some uncxposcd and aged material samples are characterized. Both devices enable us to estimate the properties accurately
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Accelerated aging of a Solar Absorber material subjected to highly concentrated Solar flux
Energy Procedia, 2013Co-Authors: Antoine Boubault, Bernard Claudet, Olivier Faugeroux, Gabriel OlaldeAbstract:To support the fast growth of Concentrating Solar Power (CSP) technologies, R&D efforts need to be continued to minimize costs. Reducing manufacturing, processing and maintenance costs is key to reach a competitive low production price for electricity. From this perspective, one issue that becomes increasingly significant is the service lifetime of Solar Absorber materials. In Solar tower receivers, Absorber materials are subjected to very intense Solar flux and cyclic thermal stresses. The chemical and physical aging mechanisms such as corrosion and oxidation, or the possible apparition of cracks or delamination are responsible for the change of the material's surface and bulk properties over time. This causes the thermal performance of the material to decline more or less rapidly. Taking a two-layer Solar Absorber material (metal + coating) that is commonly used in power tower receivers (Solar TWO, GEMASolar, SOLHYCO), we have designed several accelerated aging tests by analyzing the thermal behavior of the material in permanent and variable regimes. The experimental tests consist in subjecting the material to cyclic irradiance of variable intensity, amplitude and period to determine the fastest and most realistic tests. A Solar Accelerated Aging Facility (SAAF) was built for this purpose. It is made of a 2-meter diameter parabola concentrating the Solar radiation (up to 16, 000 times) onto a material sample that is cooled by air or water in direct contact with its rear face. A flux sensor coupled to a shutter allows us to apply the desired Solar irradiance while an infrared pyrometer monitors surface temperature of the sample. Following different constant-irradiance Solar aging treatments, the properties that are characteristic of the aging are estimated. The normal Solar absorptance of each sample is evaluated by a Solar optical fiber reflectometer. The thermophysical properties of the paint such as the thermal diffusivity, effusivity, conductivity and the thermal contact resistance between the paint layer and the metal substrate are estimated by inverse method using the measurements of an impulse photothermal experiment. In addition, untreated samples are characterized in order to provide rare data on the 'not aged' material. Careful attention should be paid to the preliminary vitrification heat treatment carried out to give the black paint its optimal absorption properties before being used. The results of the aging tests show a slight deterioration of the properties corresponding to the first aging signs of the material. The Solar absorptance and the thermal effusivity of the paint coating are the most affected properties during the tests. ?? 2013 The Authors.
