The promise and challenge of solar volumetric absorbers

Kribus, Abraham; Gray, Y.; Grijnevich, Michael; Mittelman, Gur; Sébastien, Mey-Cloutier,; Caliot, Cyril

doi:10.1016/j.solener.2014.09.035

Cited by 121 publications

(39 citation statements)

References 33 publications

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“…Indeed, for a fixed value of , β falls down when rises as was demonstrated in [12], as a consequence we obtain a lower value of . When the beam propagates within the foams, ( ) decreases with a Beerian-like behavior as was also shown in [2,27]. However, the lower the is, the more intense the diminution of ( ) is.…”

Section: Macroscopic Evolution Of the Radiative Flux On A Homogenizedsupporting

confidence: 60%

“…For chemically doped samples ( =1.8 10 21 cm -3 ), ( ) drops 21.5 % at = 300 K and 18.1 % at = 1300 K. When light penetrates within the foams, the effect of the chemical doping is more noticeable on ( ) for the first rank of cells facing the incident beam, whereas ( ) presents similar diminution when light arrives in the second mid part of the foams. A decrease of ( ) near the front face, as it the case for =1.8 10 21 cm -3 , is likely to conduct to a diminution of as it is expected when a spectral selective material is used for designing volumetric solar receiver [2].…”

Section: Macroscopic Evolution Of the Radiative Flux On A Homogenizedmentioning

confidence: 96%

“…Silicon carbide (SiC)-based open-cell foams are, today, considered as attractive porous media for developing hightemperature conversion energy systems (up to 1400 K). For example, they may be used in, porous gas burners [1], volumetric solar receivers [2] or, heat exchangers [3] among others. The growing interest for this family of material is firmly linked to the outstanding high-temperature properties of SiC, when it is considered as a dense material.…”

Section: Introductionmentioning

confidence: 99%

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COMBINING MICRO- MESO- AND MACRO-SCOPIC NUMERICAL METHODS FOR MULTISCALE RADIATIVE TRANSFER MODELING OF SiC-BASED FOAMS UP TO VERY HIGH TEMPERATURES

Badri

Biallais²,

Domingues

et al. 2018

International Heat Transfer Conference 16

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A general multiscale numerical approach is proposed to finely reproduce, up to 1300 K, the radiative heat transfers within alpha silicon carbide-based open-cell foams, with tuned chemical and textural features. The complete modeling is based on a thorough analysis performed at micro-, meso-, and macro-scopic scales. To gauge, at the microscopic scale, the influence of the electron-phonon coupling on the intrinsic optical properties of silicon carbide, a molecular dynamic method involving a modified Tersoff potential is used. Then, at the mesoscopic scale, with optical indices provided by our molecular dynamic simulations, a collision-based Monte Carlo ray tracing method is used for retrieving the homogenized radiative properties of the selected foams. Finally, at the macroscopic scale, for a set of foams (porosity ∼ 0.4-0.9), we used our micro-meso constructed radiative properties for calculating the propagation of radiation by solving the radiative transfer equation using the vectorial finite element method. In addition, a fictitious foam constructed using heavily chemical doping at microscopic level, is put forward to change the volumetric propagation of the thermal radiation.

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Section: Macroscopic Evolution Of the Radiative Flux On A Homogenizedsupporting

confidence: 60%

Section: Macroscopic Evolution Of the Radiative Flux On A Homogenizedmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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COMBINING MICRO- MESO- AND MACRO-SCOPIC NUMERICAL METHODS FOR MULTISCALE RADIATIVE TRANSFER MODELING OF SiC-BASED FOAMS UP TO VERY HIGH TEMPERATURES

Badri

Biallais²,

Domingues

et al. 2018

International Heat Transfer Conference 16

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“…Whenever the volumetric effect is reached and the temperature of the solid phase is characterized by a monotone rising trend, a low thermal conductivity can be beneficial in the conjugate heat transfer process, since it slows down the transport of heat by conduction to the front. Because of this, the rise in temperature toward the front is prevented, keeping a low inlet solid temperature and hence improving the thermal performance [18].…”

Section: Original Designmentioning

confidence: 99%

Optimized volumetric solar receiver: Thermal performance prediction and experimental validation

et al. 2017

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a b s t r a c tIn the last decade, different absorber geometries, such as foams and honeycombs, have been tested at laboratory or industrial scale in order to achieve high performance in the conversion of the solar radiation into usable heat, with the current state-of-the-art, the HiTRec-II monolithic honeycomb, characterized by a square-channel section and made out of siliconized silicon carbide (SiSiC). Such geometry has been so far the best compromise for large-scale application thanks to the low production costs, easy manufacturability through extrusion procedure and overall acceptable performance. However, it does present some drawbacks, since the geometry is not able to contain the radiative heat losses, especially from the front surface. An optimized absorber geometry, capable to reduce overall thermal losses, is presented in this work, being able to increase the final thermal efficiency of more than 12% compared to the current state-of-the-art and showing the presence of the so-called volumetric effect, since the outlet fluid temperature is higher than the solid inlet temperature. A test sample has been produced for laboratory-scale experiments, in the form of a 3:1 scaled prototype through additive manufacturing procedure, using a titanium-aluminium alloy (Ti6Al4V) and the experimental results were in good agreement with the numerical calculation, with a deviation of 3%, computed considering a 3:1 Ti6Al4V scaled-up sample. As the manufacturing technology will progress and become cheaper in the near future, it will be possible to improve the overall Solar Power Tower (SPT) plants performance using advanced micro-geometry for open volumetric receivers.

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“…Hexagonal SiC open-cell foams are unavoidable highly porous materials for developing reliable high-temperature (∼ 1300 K) systems either for solar-to-heat conversion in concentrated solar power (CSP) towers 1 or for thermal hydraulic optimization in porous gas burners. 2 Hexagonal or α-SiC open-cell foams combine light weight, high surface area per unit volume, high thermal conductivity and good thermomechanical properties.…”

mentioning

confidence: 99%

Tuning the spectral emittance of α-SiC open-cell foams up to 1300 K with their macro porosity

et al. 2016

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A simple and robust analytical model is used to finely predict the spectral emittance under air up to 1300 K of α-SiC open-cell foams constituted of optically thick struts. The model integrates both the chemical composition and the macro-porosity and is valid only if foams have volumes higher than their Representative Elementary Volumes required for determining their emittance. Infrared emission spectroscopy carried out on a doped silicon carbide single crystal associated to homemade numerical tools based on 3D meshed images (Monte Carlo Ray Tracing code, foam generator) make possible to understand the exact role of the cell network in emittance. Finally, one can tune the spectral emittance of α-SiC foams up to 1300 K by simply changing their porosity.

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The promise and challenge of solar volumetric absorbers

Cited by 121 publications

References 33 publications

COMBINING MICRO- MESO- AND MACRO-SCOPIC NUMERICAL METHODS FOR MULTISCALE RADIATIVE TRANSFER MODELING OF SiC-BASED FOAMS UP TO VERY HIGH TEMPERATURES

COMBINING MICRO- MESO- AND MACRO-SCOPIC NUMERICAL METHODS FOR MULTISCALE RADIATIVE TRANSFER MODELING OF SiC-BASED FOAMS UP TO VERY HIGH TEMPERATURES

Optimized volumetric solar receiver: Thermal performance prediction and experimental validation

Tuning the spectral emittance of α-SiC open-cell foams up to 1300 K with their macro porosity

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