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Proceeding Paper

Analysis of Radiation Propagation inside a Hierarchical Solar Volumetric Absorber

1
Department of Astronautical, Electric and Energy Engineering, Sapienza University of Rome, 00185 Rome, Italy
2
Fondazione Bruno Kessler, ARES Unit, 38123 Trento, Italy
*
Authors to whom correspondence should be addressed.
Presented at the First World Energies Forum, 14 September–5 October 2020; Available online: https://wef.sciforum.net/.
Proceedings 2020, 58(1), 27; https://doi.org/10.3390/WEF-06932
Published: 12 September 2020
(This article belongs to the Proceedings of The First World Energies Forum—Current and Future Energy Issues)
The solar receiver is a critical component of concentrated solar power technology; it works as a heat exchanger, transforming the concentrated solar radiation into high-temperature heat. Volumetric receiver technologies, using air as a heat transfer fluid, are designed to reach higher temperatures than the current receiver technology, which is limited by material resistance and fluid instability. The higher temperature, up to 1200 K, could be used in high-temperature industrial processes or a high-temperature thermodynamic cycle. A correct radiation propagation is essential to develop their performances, reducing reflection and emission losses and promote the heat transfer to the fluid. In this study, the optical behaviour of a hierarchical volumetric receiver (HVR) developed in Bruno Kessler Foundation (FBK) has been studied using Monte Carlo ray tracing (MCRT) simulations. The simulations have been validated in an experimental setup that evaluates the light transmissivity of the HVR porous structure. Two different HVR structures are evaluated with MCRT simulations that use a real solar dish geometry to configure a complete concentrated solar power (CSP) plant. Results show that frontal and rear losses are, respectively, 12% and 3% of the incoming concentrated radiation. Inside the HVR, 15% of the incoming power is propagated trough the lateral void spaces. Therefore, the power spreading avoids the overconcentration of the centre of the focalized area. The HVR optical behaviour has been investigated, showing an optical efficiency of 85%.
Keywords: concentrated solar power; radiation propagation; volumetric receivers; Monte Carlo ray tracing; high-temperature heat concentrated solar power; radiation propagation; volumetric receivers; Monte Carlo ray tracing; high-temperature heat
MDPI and ACS Style

Pratticò, L.; Bartali, R.; Crema, L.; Sciubba, E. Analysis of Radiation Propagation inside a Hierarchical Solar Volumetric Absorber. Proceedings 2020, 58, 27. https://doi.org/10.3390/WEF-06932

AMA Style

Pratticò L, Bartali R, Crema L, Sciubba E. Analysis of Radiation Propagation inside a Hierarchical Solar Volumetric Absorber. Proceedings. 2020; 58(1):27. https://doi.org/10.3390/WEF-06932

Chicago/Turabian Style

Pratticò, Luca, Ruben Bartali, Luigi Crema, and Enrico Sciubba. 2020. "Analysis of Radiation Propagation inside a Hierarchical Solar Volumetric Absorber" Proceedings 58, no. 1: 27. https://doi.org/10.3390/WEF-06932

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