Advanced high-temperature two-slab selective volumetric receiver

Menigault, T.; Flamant, Gilles; Rivoire, B.

doi:10.1016/0165-1633(91)90059-t

Cited by 34 publications

(9 citation statements)

References 6 publications

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“…Due to its high absorptance values, superficial area, porosity and high fusion point (4), and its good thermo-mechanical properties (5,6) at high temperatures, SiC presents great advantages for applications in solar receptors used in a central tower plant, having a positive impact on the efficiency of the processes of electrical energy production (6)(7)(8). The receptors used in central tower plants usually working from 500°C and above 1000°C (2), at this temperature, the required materials must be able to endure not only everyday use but also long periods of time maintaining its properties and characteristics.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Silicon Carbide in the Application of High Temperature Solar Surface Receptors

et al. 2014

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The use of ceramic surfaces for thermal solar concentrators are not new, but the high costs of fabrication and limited thermal properties have banned the application of such at large scale. Silicon carbide (SiC) is well known due to its high thermo-mechanical properties and spectral absorbance. Because of its capacities to enhance the energy transfer and its resistance to high temperatures silicon carbide have been recognized in our group as a possible improvement to increase the efficiency of electric energy production. At nano-scale SiC shows high surface area and porosity that could be tuned, making it a state-of-the-art material to be used in the application of thermal solar receptors in "Central Tower" power plants. Although the advantages are favorable, the high temperature needs for its synthesis have been an issue for its spread. In the present work, we introduce a novel method to synthesize SiC powders at lower temperature (650°C) we present also its characterization for the potential application in the concentration of thermal solar energy at high temperatures.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Silicon Carbide in the Application of High Temperature Solar Surface Receptors

et al. 2014

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“…The working fluid is generally drawn through their irradiated surface. 11 The receiver was composed of an external silica square-channel monolithic honeycomb (transparent in the solar spectrum and absorbent in the infrared band) and an internal layer of solar absorbent silicon carbide particles. 6 Structures are arranged into a volume so that maximum wall temperatures in operation are found deep inside the heat exchanging matrix.…”

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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“…In order to enhance the spectral selectivity of volumetric absorbers, several works consisting of bilayer structures have been studied. [3] presents a two-slab structure: the first slab is composed of glass-beads transmitting the solar rays to the absorbent second slab made of silica honeycomb. Another way to make bilayer structure is to functionalize the absorber with a selective coating: [4], [5] or [6] present different spinel oxide coatings with a high temperature and oxidation stability and good selective efficiencies, showing that oxide coatings can be a suitable way to improve spectral selectivity of SiC absorbers.…”

Section: Introductionmentioning

confidence: 99%

Functionalization of SiC-based materials by a selective YBa2Cu3O7-δ coating via sol–gel route in order to optimize their optical properties

2015

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SiC-based materials are good candidates for the application as solar receivers except concerning their optical properties. Indeed, considering the use at high temperature, materials used as solar receivers have to efficiently absorb the visible-near infrared waves (corresponding to solar spectral range) and simultaneously reflect the mid and far-infrared rays but SiC is absorbent in all the whole visible-infrared spectral domain. In this challenging work, a suitable YBa 2 Cu 3 O 7-δ oxide which can present appropriate optical properties is studied. It was synthesized following a sol-gel route and it was obtained with a high level of purity. YBa 2 Cu 3 O 7-δ pellets were realized and heat treated at different temperatures revealing that the higher the heat treatment is, the better the oxygen stoichiometry (7-δ) is and the smoothest the surface is. This directly acts on the YBa 2 Cu 3 O 7-δ optical properties. Considering these results, an YBa 2 Cu 3 O 7-δ coating was realized on SiC pellets by dip-coating. A homogenous and covering layer of about 10 μm was obtained presenting very promising optical properties which were predominant in the FIR-MIR range whereas absorptance was increased in NIR-visible range.

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Advanced high-temperature two-slab selective volumetric receiver

Cited by 34 publications

References 6 publications

Synthesis and Characterization of Silicon Carbide in the Application of High Temperature Solar Surface Receptors

Synthesis and Characterization of Silicon Carbide in the Application of High Temperature Solar Surface Receptors

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

Functionalization of SiC-based materials by a selective YBa2Cu3O7-δ coating via sol–gel route in order to optimize their optical properties

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