Optimization of High Temperature SiC Volumetric Solar Absorber

Mey, Sebastian; Caliot, Cyril; Flamant, Gilles; Kribus, Abraham; Gray, Y.

doi:10.1016/j.egypro.2014.03.051

Cited by 33 publications

(11 citation statements)

References 15 publications

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“…Therefore, the use of analytical models (e.g. Rosseland, P-1 model or two-flux approximation) that simplify the calculation of radiation propagation is a common practice (Mey et al, 2014;Wang et al, 2013;Wu et al, 2011b). The analysis of these models indicates that the radiation propagation in open-cell foam absorbers is lower than in honeycombs.…”

Section: Introductionmentioning

confidence: 98%

Numerical analysis of radiation propagation in a multi-layer volumetric solar absorber composed of a stack of square grids

et al. 2015

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Section: Introductionmentioning

confidence: 98%

Numerical analysis of radiation propagation in a multi-layer volumetric solar absorber composed of a stack of square grids

et al. 2015

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“…6 Structures are arranged into a volume so that maximum wall temperatures in operation are found deep inside the heat exchanging matrix. But researchers still rely on semiempirical correlations for radiative and convective heat transfer, [16][17][18] and optimisation is complex because of conjugate effects. 7 Relatively colder outer surfaces and minimum thermal emission losses are produced as a result, which allows volumetric receivers to operate at irradiance levels approximately 5 times higher than tubular ones.…”

Section: Introductionmentioning

confidence: 99%

“…12 Recent advances in computational simulations have facilitated investigations into the combined heat transfer mechanisms found in volumetric receivers, [13][14][15] including the absorption of incident radiation into their solid structure and the local convective heat transfer coefficient distributions. But researchers still rely on semiempirical correlations for radiative and convective heat transfer, [16][17][18] and optimisation is complex because of conjugate effects. It is thus common that numerical studies address specific aspects of the system, rather than provide precise fully integrated validations.…”

Section: Introductionmentioning

confidence: 99%

A new calorimetric facility to investigate radiative-convective heat exchangers for concentrated solar power applications

et al. 2017

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Summary A new calorimetric facility for the aerothermal assessment of radiative‐convective heat exchangers in concentrating solar power applications has been developed and is described in this paper. The configuration of volumetric solar receivers enables concentrated sunlight to be absorbed and conducted within their solid volume, from where it is gradually transferred by forced convection to a heat transfer fluid flowing through their structure. Current design trends towards higher thermal conversion efficiencies have led to the use of complex intricate geometries to maximise temperatures deep inside the structure. The work presented aims to aid these objectives by commissioning a new experimental facility for the fully integrated evaluation of such components. The facility is composed of a high‐flux solar simulator that provides 1.2 kW of radiative power, a radiation homogeniser, inlet and outlet collector modules, and a working section that can accommodate volumetric receivers up to 80 mm × 80 mm in aperture. Irradiance levels and flow field nondimensional governing parameters are highly representative of on‐sun experiments at larger scales. Results from experiments with a siliconised silicon carbide monolithic honeycomb are presented, conducted at realistic conditions of incident radiative power per unit mass flow rate to validate its design point operation. Measurements conducted include absorber solid temperature distributions, air inlet and outlet temperatures, pressure drop, incident heat flux, and overall thermal efficiency. The relative influence of different sources of thermal loss is analysed and discussed.

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“…Regarding foam structure, different models have been used in order to compute the radiative term, such as the two flux approximation [6][7], the Rosseland diffusion equation [8][9] and the P-l model [10]. However, in the previous studies, the real geometry of the foam structure is not considered and simple representation of the structure as a porous media is employed.…”

Section: Introductlonmentioning

confidence: 99%

Optical study of using ceramic foams for volumetric solar receivers

Mahmoud

Rady

Attia

et al. 2016

2016 International Renewable and Sustainable Energy Conference (IRSEC)

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Ceramic foams are promlsmg materials for volumetrie solar receivers in concentrated solar power (CSP) plants. Understanding the solar heat flux distribution on the receiver is of great importance for optimizing the receiver volumetrie efficiency and thermal performance. This work presents a 3D optical analysis of ceramic based volumetrie solar receivers. The optical analysis is conducted using a Monte Carlo based solar ray tracing software. Ceramic foams are represented by idealized packed tetrakaidecahedron structures. The absorbed heat flux distribution and the effect of cell size, porosity and absorptivity on the penetration depth of the absorbed heat flux are investigated. Comparisons have been made with extruded honeycomb receivers. The results clearly demonstrate the dependence of flux distribution and penetration depth of solar rays on the material absorptivity and structure. The simulation results show a uniform heat flux distribution on the frontal faces with an intensity that increases with increasing the material absorptivity. Both the porosity and the cell size have a great effect on the penetration depth of the absorbed heat flux. In general, foam structure shows larger penetration depths than extruded honeycombs.

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Optimization of High Temperature SiC Volumetric Solar Absorber

Cited by 33 publications

References 15 publications

Numerical analysis of radiation propagation in a multi-layer volumetric solar absorber composed of a stack of square grids

Numerical analysis of radiation propagation in a multi-layer volumetric solar absorber composed of a stack of square grids

A new calorimetric facility to investigate radiative-convective heat exchangers for concentrated solar power applications

Optical study of using ceramic foams for volumetric solar receivers

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