Two novel high-porosity materials as volumetric receivers for concentrated solar radiation

Fend, Thomas

doi:10.1016/s0927-0248(04)00177-1

Cited by 26 publications

(45 citation statements)

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“…To design it, porous ceramic foams appear very interesting in the range of 300-1200°C because of their large specific surface which directly heats the air flowing through them. Generally, porous SiC-based materials are chosen as solar receivers because of their high temperature mechanical resistance [1]. Note that materials used as solar receivers have to efficiently absorb the visible-near infrared waves (corresponding to the solar spectral range).…”

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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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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“…Researchers have suggested various configurations for volumetric receiver designs, including: gas-particle suspensions (Bertocchi et al, 2004;Miller and Koenigsdorff, 1991), liquid films (Bohn and Wang, 1988;Caouris et al, 1978), and metal foams (Fend et al, 2004;Pitz-Paal et al, 1997). In this study, we focus on liquid-based volumetric receivers with integrated storage for central receiver CSP systems with beam-down optics (Epstein et al, 1999;Kribus et al, 1998;Yogev et al, 1998); an example configuration was recently described by Slocum et al (2011) where hillside heliostats focus light onto a molten salt volumetric receiver.…”

Section: Introductionmentioning

confidence: 99%

Optimization of nanofluid volumetric receivers for solar thermal energy conversion

2012

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Improvements in solar-to-thermal energy conversion will accelerate the development of efficient concentrated solar power systems. Nanofluid volumetric receivers, where nanoparticles in a liquid medium directly absorb solar radiation, promise increased performance over surface receivers by minimizing temperature differences between the absorber and the fluid, which consequently reduces emissive losses. We present a combined modeling and experimental study to optimize the efficiency of liquid-based solar receivers seeded with carbon-coated absorbing nanoparticles. A one-dimensional transient heat transfer model was developed to investigate the effect of solar concentration, nanofluid height, and optical thickness on receiver performance. Simultaneously, we experimentally investigated a cylindrical nanofluid volumetric receiver, and showed good agreement with the model for varying optical thicknesses of the nanofluid. Based on the model, the efficiency of nanofluid volumetric receivers increases with increasing solar concentration and nanofluid height. The total receiver-side efficiencies are predicted to exceed 35% when nanofluid volumetric receivers are coupled to a power cycle and optimized with respect to the optical thickness and solar exposure time. This work provides insights as to how nanofluids can be best utilized as volumetric receivers in solar applications, such as receivers with integrated storage for beam-down CSP and future high concentration solar thermal energy conversion systems.

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“…Porous materials with a parallel channel geometry with thin walls showed disadvantageous permeability properties. These printed-material properties can be significantly changed by applying a new manufacturing process and modifying the channel geometry and porosity [19].…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis and design of a volumetric solar absorber depending on the porosity

Roldán¹,

Smirnova

Fend

et al. 2014

Renewable Energy

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a b s t r a c tThe thermal evaluation of different absorber configurations for a volumetric solar receiver designed for a solar furnace has been carried out by means of commercial Computational Fluid Dynamics (CFD) software in a 2D numerical model. Simulation results for proposed configurations depending on the porosity are discussed and compared to find the optimum configuration for which flow instabilities and thermal stresses are minimized and higher efficiencies are reached. The results obtained from the comparison of air velocity and thermal profiles at the absorber outlet propose a gradual-porosity configuration as an alternative to a previous design of a porous silicon-carbide honeycomb structure in order to heat an air stream up to temperatures suited for several high-temperature industrial processes.

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Two novel high-porosity materials as volumetric receivers for concentrated solar radiation

Cited by 26 publications

References 0 publications

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

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

Optimization of nanofluid volumetric receivers for solar thermal energy conversion

Thermal analysis and design of a volumetric solar absorber depending on the porosity

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