Optical characterization of TiAlN x /TiAlN y /Al 2 O 3 tandem solar selective absorber coatings

Soum‐Glaude, Audrey; Gal, Alex Le; Bichotte, Maxime; Escape, Christophe; Dubost, Laurent

doi:10.1016/j.solmat.2017.06.007

Cited by 73 publications

(26 citation statements)

References 23 publications

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“…[8] [9]. Typical activation energies per molecule are, e.g., 0.5 eV for the oxidation of cytochrome [10], or 0.72 eV for the CO 2 exchange [11], or 1.6 eV for the CO 2 oxidation [12].…”

Section: Introductionmentioning

confidence: 99%

Probing the Wave Nature of Light-Matter Interaction

Boone¹,

Jackson²,

Swecker³

et al. 2018

WJCMP

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The wave-particle duality of light is a controversial topic in modern physics. In this context, this work highlights the ability of the wave-nature of light on its own to account for the conservation of energy in light-matter interaction. Two simple fundamental properties of light as wave are involved: its period and its power P. The power P depends only on the amplitude of the wave's electric and magnetic fields (Poynting's vector), and can easily be measured with a power sensor for visible and infrared lasers. The advantage of such a wave-based approach is that it unveils unexpected effects of light's power P capable of explaining numerous results published in current scientific literature, of correlating phenomena otherwise considered as disjointed, and of making predictions on ways to employ the electromagnetic (EM) waves which so far are unexplored. In this framework, this work focuses on determining the magnitude of the time interval that, coupled with light's power P, establishes the energy conserved in the exchange of energy between light and matter. To reach this goal, capacitors were excited with visible and IR lasers at variable average power P. As the result of combining experimental measurements and simulations based on the law of conservation of energy, it was found that the product of the period of the light by its power P fixes the magnitude of the energy conserved in light's interaction with the capacitors. This finding highlights that the energy exchanged is defined in the time interval equal to the period of the light's wave. The validity of the finding is shown to hold in light's interaction with matter in general, e.g.

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“…[8] [9]. Typical activation energies per molecule are, e.g., 0.5 eV for the oxidation of cytochrome [10], or 0.72 eV for the CO 2 exchange [11], or 1.6 eV for the CO 2 oxidation [12].…”

Section: Introductionmentioning

confidence: 99%

Probing the Wave Nature of Light-Matter Interaction

Boone¹,

Jackson²,

Swecker³

et al. 2018

WJCMP

View full text Add to dashboard Cite

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“…A heat-flux related loss was seen to be a function of the absorber temperatures, absorber emittance, and also the collector's optical flux concentration ratio. The external receivers, which did not contain a vacuum attachment, must have an extra insert that represents the convective losses occurring between the absorber and environment [63]. This energy loss could be decreased using directional selectivity where the radiation was repressed at the angles greater than the incident angle of the sun rays that hit the absorber [60].…”

Section: Effect Of the Heat Flux On The External Receivermentioning

confidence: 99%

Solar Tower Power: The Impact of External Receiver on Optimal Performance and Energy Storage

Shatnawi,

Lim,

Ismail

2019

IJEAT

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An external receiver was seen as a major component of the Solar Tower Power (STP) plant. This generated stable power from concentrated sunlight. However, the flux distribution on its surface was an issue related to the external receiver that could affect the performance and energy storage in STP. The heat flux increased during long-term use, failure reduction, receiver efficiency and performance. The main advantage of the STP structure was its substantial heat storage capacity which allowed the system to generate stable and continuous electric power. In this study, the researchers reviewed existing literature to investigate the effect of the STP external receiver on the optimum energy storage and performance of the STP; especially regarding the solar flux distribution and efficiency. The researchers aim to improve the external receiver’s optimal performance without affecting the incident heat fluxes. The literature review indicates that ideal receiver conditions lead to solar energy flux distribution optimal performance. Therefore, system optimisation was necessary to satisfy all limitations; like loss occurring due to heliostat field, solar flux flow patterns, external tubular receiver designs, and Heat Transfer Fluid (HTF) selection. These limitations, along with factors affecting these limitations, are reviewed in this study.

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“…One of the most common coatings in high-temperature CSP systems is Pyromark 2500 [6], which loses a significant amount of heat through emission in the IR range due to the lack of high spectral selectivity in spite of high solar absorption and thermal stability at elevated temperatures [7]. Artificial composites or micro/nanostructured metamaterials have been recently developed as selective solar thermal absorbers [8][9][10][11][12][13][14] such as subwavelength gratings [15][16][17][18][19][20], nanocomposites [21] or nanoparticles [22], cermet [23][24][25], photonic crystals [26][27], and multilayers [28][29][30][31]. We recently reported the design and fabrication of an ultrathin multilayer selective solar absorber [30], namely metafilm absorber, which is thermally stable in air up to 600C, while thermal cycle testing revealed its long-term thermal stability at 400C in ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Solar Thermal Energy Conversion Enhanced by Spectrally-Selective Metafilm Absorber under Concentrated Solar Irradiation

Alshehri¹,

Ni²,

Taylor³

et al. 2020

ES Energy Environ.

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Concentrating solar power, particularly parabolic trough system with solar concentrations less than 50, requires spectrally selective solar absorbers that are thermally stable at high temperatures of 400C above to achieve high efficiency. In this work, the solar-thermal energy conversion performance of a selective multilayer metafilm absorber with excellent thermal stability is characterized along with a black absorber for comparison by a lab-scale experimental setup that measures the steady-state absorber temperature under multiple solar concentrations. Heat transfer analysis is employed to elucidate different energy conversion modes and validate the solar-thermal experiment. The solar-thermal efficiency was measured to be 38% from the experiment and projected to be 86% without parasitic heat losses for the selective metafilm-on-Si absorber at the temperature of 336C under 9.1 suns, in comparison with measured 30% and projected 55% efficiency for the black absorber at a lower temperature of 266C under the same solar concentration. In addition, the metafilm absorber deposited on the flexible cost-effective stainless steel foil achieves the solar-thermal efficiency 57% at a steady-state temperature of 371C under 10 suns during the lab-scale experiment with losses, while a highest efficiency of 83% was projected under the same conditions for practical solar thermal applications. The results here will facilitate the research and development of novel solar materials for high-efficiency solar thermal energy conversion.

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Optical characterization of TiAlN x /TiAlN y /Al 2 O 3 tandem solar selective absorber coatings

Cited by 73 publications

References 23 publications

Probing the Wave Nature of Light-Matter Interaction

Probing the Wave Nature of Light-Matter Interaction

Solar Tower Power: The Impact of External Receiver on Optimal Performance and Energy Storage

High-Temperature Solar Thermal Energy Conversion Enhanced by Spectrally-Selective Metafilm Absorber under Concentrated Solar Irradiation

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