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Radiation Performance of a Cavity Receiver for a Parabolic Dish Solar Concentrator System

O. López, A. Arenas, A. Baños

2016/5/20

Abstract

The radiation performance of a modified cavity receiver for a low-cost concentrating solar power plant is studied. The optical phenomenon taking place is modelled by using a ray tracing technique based on a finite element approach. This design is also compared to a flat receiver. Corrections for sunlight and optical errors of the parabolic dish are included. Its efficiency is analysed by varying some geometrical parameters of the receiver, maximizing the total power absorbed. It is found that the flux density on the cavity walls is less than on the flat receiver walls, hence decreasing heat losses. Also, in order to reach a maximum radiation performance the receiver is to be placed closer to the concentrator from the focal position. However, the aperture does not improve notably its efficiency, although it has an important role in the convection heat losses as shown in previous works. Finally by varying the cavity diameter it is possible to improve the efficiency when it is well adjusted to the radiation performance of the concentrator on the focal point.

Published in: Renewable Energy & Power Quality Journal (RE&PQJ, Nº. 14)
Pages:488-493 Date of Publication: 2016/5/20
ISSN: 2172-038X Date of Current Version:2016/05/04
REF:370-16 Issue Date: May 2016
DOI:10.24084/repqj14.370 Publisher: EA4EPQ

Authors and affiliations

O. López(1), A. Arenas(2), A. Baños(1)
1. Departamento de Informática y Sistemas, University of Murcia. Spain
2. Departamento de Electromagnetismo y Electrónica, University of Murcia. Spain

Key words

Radiation performance, Solar Collector, Geometrical optics, Cavity Receiver, Flux Distribution

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