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Title: Effect of thickness on the thermo-hydraulic performance of porous volumetric solar receivers with different internal geometries
Authors: Barreto, Germilly
Canhoto, Paulo
Collares-Pereira, Manuel
Keywords: Solar Energy
Volumetric receiver
Porous media
Thermal efficiency
Issue Date: 8-Dec-2021
Citation: Barreto, G., Canhoto, P., Collares-Pereira, M. (2021). Effect of thickness on the thermo-hydraulic performance of porous volumetric solar receivers with different internal geometries. 8th European Thermal Sciences Conference (EUROTHERM 2021), Journal of Physics: Conference Series 2116, 012116. doi 10.1088/1742-6596/2116/1/012116
Abstract: In this work, the effect of thickness on the thermal and hydrodynamic performance of porous volumetric solar receivers made of open-cell silicon carbide (SiC) ceramic foam is investigated using an in-house detailed numerical model. The model is based in a Computational Fluid Dynamics (CFD) technique to solve the volume averaged mass, momentum and energy conservation equations, including the exchange of thermal radiation inside the receiver. A Monte Carlo Ray Tracing (MCRT) method was developed and then used to model the solar radiation transport in the porous media. Two optimised internal geometries (porosity and pores size) of the receiver with adiabatic side-walls are investigated for different thicknesses. Results show that the optimal thickness depends on the porosity and pores size and there is a value from which the thermal efficiency is nearly constant and the pressure drop always increase. It was also found that the thickness should be approximately between 5 and 7 cm for porosity and pores diameter between 0.85 and 0.90 and 3.0 mm and 4.5 mm, respectively, aiming to maximise thermal efficiency by decreasing the transmission losses of solar radiation, and to keep low pressure drop.
Type: article
Appears in Collections:ICT - Artigos em Livros de Actas/Proceedings

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