Optimization of High Temperature SiC Volumetric Solar Absorber

Focusing on radiative properties (absorption and scattering coefficient, scattering phase-function) of silicon carbide foams, several predictive models are compared to spectral transmittance and reflectance measurements (bi-directional and directional- hemispherical) in the aim of determining new co...

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Bibliographic Details
Published in:Energy procedia 2014, Vol.49, p.478-487
Main Authors: Mey, S., Caliot, C., Flamant, G., Kribus, A., Gray, Y.
Format: Article
Language:English
Subjects:
ceramic foam
concentrated solar power (CSP)
conduction
convection
coupled heat transfers
Darcy-Forchheimer law
flow modelling
Monte-Carlo
Navier-Stokes equations
P-1 model
porous medium
pressure drop
radiation
reticulate porous ceramic (RPC)
Rosseland
silicon carbide (SiC)
two-flux approximation
volumetric solar absorber
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Summary:Focusing on radiative properties (absorption and scattering coefficient, scattering phase-function) of silicon carbide foams, several predictive models are compared to spectral transmittance and reflectance measurements (bi-directional and directional- hemispherical) in the aim of determining new correlations based on ceramic foam characteristics (struts/pores size and porosity). A mono-dimensional modeling is developed to solve Navier-stokes equations (conservation of mass and momentum) and energy equations (coupled heat transfers) inside the absorber. Several radiative models are tested to approximate the radiative transfer equation end compute the radiative source term (Rosseland, P-1 model, and two-flux approximation). Numerical simulations are compared to reference results obtained with Monte-Carlo algorithm using net-exchange formulation.
ISSN:1876-6102
1876-6102
DOI:10.1016/j.egypro.2014.03.051