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Technical Briefs

Three-Dimensional Analysis of a Concentrated Solar Flux

[+] Author and Article Information
David Riveros-Rosas

Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Avenida Xochicalco S/N, Temixco, CP 62580 Morelos, México

Marcelino Sánchez-González

 Solucar R&D, Buhaira 2, 41018 Sevilla, Spain

Claudio A. Estrada

Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Avenida Xochicalco S/N, Temixco, CP 62580 Morelos, Méxicocestrada@cie.unam.mx

J. Sol. Energy Eng 130(1), 014503 (Jan 07, 2008) (4 pages) doi:10.1115/1.2807212 History: Received November 15, 2006; Revised June 09, 2007; Published January 07, 2008

In order to improve the durability of receivers used in solar concentrating systems, it is necessary to minimize thermal stress during their operation. A possible way to do that is to design receivers in which the radiative flux density is homogeneous at the surface. For this reason, a detailed 3D study has been carried out for the distribution of concentrated solar radiation in the focal zone of a parabolic concentrator. A computer program has been developed to obtain isosurfaces of solar irradiance and achieve a homogeneous radiation flux on the receiver surface. The algorithm of the program proposes a methodology to obtain flux isosurfaces for a great variety of optical configurations. The effect of the optical errors on the mirror surface has been studied, as well as the effect of the shape of the mirror, e.g., round, square, or faceted. The numerical calculations were made using the convolution ray tracing technique.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the concentrator, the focal point, and the scanning planes

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Figure 2

(a) A protosurface of homogeneous irradiance from a set of horizontal planes and (b) a protosurface of homogeneous irradiance from a set of nonhorizontal planes

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Figure 3

An exaggerated view of the protosurface superposition to generate an isosurface

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Figure 4

Superposition of protosurfaces along the positive X axis in which the irradiance is homogeneous

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Figure 5

Cross section of irradiance isosurfaces considering a parabolic dish concentrator

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Figure 6

Cross section of irradiance isosurfaces assuming different mirror surface errors

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Figure 7

Comparison between the irradiance level on the isosurface for 8×105W∕m2 and a flat plane receptor located at the same distance of the isosurface

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Figure 8

(a) 3D view of an irradiance isosurface of 200W∕cm2 and (b) lateral view of isosurfaces of irradiances of 200W∕cm2 and 400W∕cm2

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Figure 9

(a) Schematic of the facet distribution and the incidence of reflected rays in the vertex of each facet and (b) 3D view of an irradiance isosurface, 200W∕cm2

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