Solar Flux Map Distribution of a Parabolic-Spheric Dish Based on Photographic Method

Roccabruna, Mattia; Menna, Fabio; Remondino, Fabio; Crema, Luigi

doi:10.18086/eurosun2018.10.10

Cited by 1 publication

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“…In the second part, taking into account the lab results, we modelled the performance of two HVR geometries coupled with a real concentrated solar system. In these simulations, a solar dish geometry of a real prototype [21], Contest project, was used as a concentrated source that hits the HVR geometry.…”

Section: Receivermentioning

confidence: 99%

“…The optical concentrator was designed based on the geometrical generatrix of a solar dish of the CONTEST project [21]. The solar dish used was a spherical-parabolical optical concentrator with an aperture diameter of 8.6 m. In the central part of the dish there were spherical curved mirrors with a curvature of 9.293 m. The peripheral ring had, instead, a parabolic curvature, with a focal distance of 4.5 m. As parameters of the mirrors, we set 85% of reflectivity and a specular error of 4 mrad.…”

Section: Mcrt Simulations Using Concentrated Radiative Sourcementioning

confidence: 99%

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Analysis of Radiation Propagation inside a Hierarchical Solar Volumetric Absorber

Pratticò

Bartali

Crema

et al. 2020

The First World Energies Forum—Current and Future Energy Issues

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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%.

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Section: Receivermentioning

confidence: 99%

Section: Mcrt Simulations Using Concentrated Radiative Sourcementioning

confidence: 99%