Influence of the size of facets on point focus solar concentrators

Riveros-Rosas, David; Sánchez-González, Marcelino; Arancibia-Bulnes, Camilo A.; Estrada, Claudio A.

doi:10.1016/j.renene.2010.08.038

Cited by 26 publications

(11 citation statements)

References 8 publications

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“…Moreover, since the final spot is the overlap of the multiple facets reflections, the size and the uniformity of the final spot is influenced by projection and blocking effects which increase with the distance of the facets from the center of the whole assembly. For this reason, such a mosaic system is not able to both have big collecting area and high concentration ratio without embedding a high number of facets and high focal distances, as reported in similar works [30][31][32]. In [32] the economical viability is however claimed for a specific configuration of faceted dense array system since a cost for the output power below 2 euro/W has been calculated.…”

Section: Introductionmentioning

confidence: 94%

Enhancing the efficiency of solar concentrators by controlled optical aberrations: Method and photovoltaic application

et al. 2015

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Section: Introductionmentioning

confidence: 94%

Enhancing the efficiency of solar concentrators by controlled optical aberrations: Method and photovoltaic application

et al. 2015

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“…Basically, the multi-facet type of the dish concentrators behaves in a different manner than the continuous surface concentrators [33]. This can be proven by mapping the irradiance contours from the multi-facet parabolic dish of 68 facets, as displayed in Figure 7.…”

Section: Optimization Of Number Of Facetsmentioning

confidence: 99%

Design and Three-Dimensional Simulation of a Solar Dish-Stirling Engine

Ghafour¹,

Mikhael²,

Ghandour³

2021

ARFMTS

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Design and three-dimensional simulation of a solar Dish-Stirling (SDS) engine is currently performed. The design starts with the GPU-3 Stirling engine, which is originally built to generate power from the fossil fuel exclusively. The design is conducted through three subsequent phases. Firstly, several parabolic dishes with different rim angles and number of facets are investigated to optimally design the dish concentrator. Secondly, different relative positions of the receiver aperture to the dish focal plane are tested to reach the optimal position. The optical simulation of the solar concentration process is carried out using SolTRACE software. Finally, an optimal design for a cavity receiver that involves a new structure of the heater tubes is performed. The simulation of the engine with the designed receiver is implemented using the commercial CFD code ANSYS FLUENT. Having finished the design, a comprehensive energy analysis of the designed SDS engine is carried out. The results show that a nearly uniform temperature distribution of the heater tubes throughout the cycle is achieved. The overall thermal efficiency of the designed SDS engine is about 31.8 % at a DNI of 1000 W/m2.

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“…Ray tracing simulation is a very effective tool to design and optimize parameters of solar concentrators [28]. For the optical analysis, we employed the Tracepro ray-tracing tool [34].…”

Section: Ray-trace Simulationsmentioning

confidence: 99%

A novel 2-stage dish concentrator with improved optical performance for concentrating solar power plants

et al. 2017

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Here we propose a novel 2-stage dish concentrator system for concentrating solar power plants based on the so-called overlap method, which improves both the radial flux concentration ratio (β) and the intercept factor () of the concentrator. The 2-stage dish is composed of paraboloid primary and hyperboloid secondary mirrors having a special hollow structure enabling the mirrors to overlap, but avoiding excess shading. Geometric and optical analyses with ray-tracing show maximum values of β=15,498 and =0.78. Also, the size of the focal spot could be reduced. The concept is applicable for solar tower concepts enabling more compact unit mirrors and reducing the receiver size.

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Influence of the size of facets on point focus solar concentrators

Cited by 26 publications

References 8 publications

Enhancing the efficiency of solar concentrators by controlled optical aberrations: Method and photovoltaic application

Enhancing the efficiency of solar concentrators by controlled optical aberrations: Method and photovoltaic application

Design and Three-Dimensional Simulation of a Solar Dish-Stirling Engine

A novel 2-stage dish concentrator with improved optical performance for concentrating solar power plants

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