Ultra-refractory ceramics for high-temperature solar absorbers

Sani, Elisa; Mercatelli, Luca; Francini, F.; Sans, Jean-Louis; Sciti, Diletta

doi:10.1016/j.scriptamat.2011.07.033

Cited by 73 publications

(41 citation statements)

References 14 publications

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“…However, the measured emittance value is not exactly a constant and thus some spectral differences with respect to blackbody in the regions 0.6-2.8 mm and 8-14 mm can be demonstrated. These differences are much less pronounced for ZrO 2 _b than for SiC [5] and previously investigated boride and carbide ultra-high temperature ceramics [26,5,6].…”

Section: Resultsmentioning

confidence: 64%

“…Further details of the MEDIASE setup can be found, for instance, in [5]. The emittance was calculated as the ratio between the measured radiance and the blackbody radiance at the same temperature.…”

Section: Optical Measurementsmentioning

confidence: 99%

“…Very recently, our group has studied several non-oxide materials belonging to the family of ultra-high temperature ceramics (UHTCs) [5][6][7][8][9][10], showing promising characteristics for solar absorber applications.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optical properties of black and white ZrO2 for solar receiver applications

Sani

Mercatelli

Sans

et al. 2015

Solar Energy Materials and Solar Cells

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Section: Resultsmentioning

confidence: 64%

Section: Optical Measurementsmentioning

confidence: 99%

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Optical properties of black and white ZrO2 for solar receiver applications

Sani

Mercatelli

Sans

et al. 2015

Solar Energy Materials and Solar Cells

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“…Traditionally, ceramic materials are used to construct solar receivers [18] because of their ability to withstand extreme temperatures. However, ceramic materials have several drawbacks, namely low thermal conductivity and brittleness.…”

Section: Introductionmentioning

confidence: 99%

The use of graphite foams for simultaneous collection and storage of concentrated solar energy

Badenhorst

Fox

Mutalib

2016

Carbon

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Graphite foams of varying composition and density were prepared using a low cost, local pitch material and expandable graphite for use in solar energy capture. The foams have a high degree of graphitization but exhibit a fine mosaic texture. A small oxidative treatment (6% mass loss) was necessary to fully open the foam pores. As the density is reduced a large decrease in the foam surface area was observed. Despite this, an increase in solar energy capture efficiency was measured due to increased circulation through the foam. By varying foam geometry and the concentration ratio it was demonstrated that the receiver size can be reduced by 75% at the same efficiency.The foam with the lowest density was used to test the thermal performance of a simultaneous energy capture and storage concept using a phase change material. The melting time of the phase change material is reduced by 46% whilst only reducing the energy storage density by 18%. In addition it was found that the foam composite resulted in more ideal phase transition behaviour due to the elimination of incongruent melting. The composite can effectively capture, store and discharge thermal energy, at a constant temperature, without any additional requirements.

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“…In [6,7], it is pointed out that the efficiency of solar power plants increases rapidly with increasing working temperatures. Therefore, the high-temperature operation needs to find the relevant materials, especially for solar energy receivers with low emissivity and high absorptivity.…”

Section: Introductionmentioning

confidence: 99%

Radiative Properties of Stoichiometric Hafnium, Titanium, and Zirconium Carbides: Thermodynamics of Thermal Radiation

Fisenko¹,

Lemberg²

2012

Int J Thermophys

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The true temperatures of the thermal radiation of stoichiometric hafnium, titanium, and zirconium carbides are defined from the generalized Wien displacement law. It is shown that Wien's displacement law for the investigated stoichiometric carbides decreases linearly with increasing temperature. The uncertainties in the determination of the true temperature are no greater than 1 %. For determining the true temperature of stoichiometric carbides, the experimental values of the position of the maximum of the spectral density power are needed. By extrapolating the generalized Wien displacement laws in the ultra-high-temperature region, the positions of the maximum of the normal energy density of hafnium, titanium, and zirconium carbides at melting temperatures are obtained. Thermodynamics of thermal radiation of stoichiometric carbides is constructed by using the temperature dependences of the generalized Stefan-Boltzmann law. The calculated values of the normal total emissivity for the investigated carbides at different temperatures are in good agreement with experimental data. For determining the true temperatures of the thermal radiation of stoichiometric carbides, experimental values of either the normal total emissivity or the normal total energy density are needed. The temperature dependences of the Helmholtz free energy, entropy, heat capacity at constant volume, pressure, enthalpy, and internal energy of the thermal radiation of stoichiometric carbides at high temperature are obtained. It is shown that thermodynamic function values increase with increasing temperature as a power law.Keywords Enthalpy · Entropy · Generalized Wien's displacement and Stefan-Boltzmann's laws · Heat capacity · Helmholtz free energy · A. I. Fisenko (B) · V. Lemberg

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Ultra-refractory ceramics for high-temperature solar absorbers

Cited by 73 publications

References 14 publications

Optical properties of black and white ZrO2 for solar receiver applications

Optical properties of black and white ZrO2 for solar receiver applications

The use of graphite foams for simultaneous collection and storage of concentrated solar energy

Radiative Properties of Stoichiometric Hafnium, Titanium, and Zirconium Carbides: Thermodynamics of Thermal Radiation

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