Direct transfer of solar radiation to high temperature applications

Rahou, M, Andrews, J and Rosengarten, G 2013, 'Direct transfer of solar radiation to high temperature applications', in James Friend, H. Hoe Tan (ed.) Proceedings of SPIE 8923, Micro/Nano Materials, Devices, and Systems, Melbourne, Australia, 8 - 11 December 2013, pp. 1-10.

Document type: Conference Paper
Collection: Conference Papers

Title Direct transfer of solar radiation to high temperature applications
Author(s) Rahou, M
Andrews, J
Rosengarten, G
Year 2013
Conference name SPIE 8923, Micro/Nano Materials, Devices, and Systems
Conference location Melbourne, Australia
Conference dates 8 - 11 December 2013
Proceedings title Proceedings of SPIE 8923, Micro/Nano Materials, Devices, and Systems
Editor(s) James Friend, H. Hoe Tan
Publisher SPIE
Place of publication Bellingham, Australia
Start page 1
End page 10
Total pages 10
Abstract This paper reviews the different methods of directly transferring solar radiation from concentrated solar collectors to medium to high temperature thermal absorbers, at temperatures ranging from 100 to 400°C. These methods are divided into four main categories associated with the radiation transfer medium: optical fibres, photonic crystal fibres, metal waveguides and light guides. The reviewed methods are novel compared to most rooftop solar concentrators that have a receiver and a thermal storage unit coupled by heat transfer fluids. Bundled optical fibres have the capability of transferring concentrated solar energy across the full wavelength spectrum with the maximum optical efficiency. In this study two different types of optical bundle, including hard polymer cladding silica (HPCS) and polymer clad silica (PCS) fibres are introduced which offer a broad spectrum transmission range from 300 to 1700 nm, low levels of losses through attenuation and the best resistance to heating. These fibres are able to transmit about 94% of the solar radiation over a distance of 10 m. The main parameters that determine the overall efficiency of the system are the concentration ratio, the acceptance angle of the fibres, and the matching of the diameter of the focus spot of the concentrator and the internal diameter of the fibre. In order to maximize the coupling efficiency of the system, higher levels of concentration are required which can be achieved through lenses or other non-imaging concentrators. However, these additional components add to the cost and complexity of the system. To avoid this problem we use tapered bundles of optical fibres that enhance the coupling efficiency by increasing the acceptance angle and consequently the coupling efficiency of the system.
Subjects Renewable Power and Energy Systems Engineering (excl. Solar Cells)
Keyword(s) Radiation
solar concentrators
optical fibers
tapered fibers
DOI - identifier 10.1117/12.2033795
Copyright notice © 2013 SPIE
ISBN 9780819498144
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