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Raytrace simulations and experimental studies of luminescent solar concentrators

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Bose-R-2014-PhD-Thesis.pdfPhD Thesis by Rahul Bose15.15 MBAdobe PDFView/Open
Title: Raytrace simulations and experimental studies of luminescent solar concentrators
Authors: Bose, Rahul
Item Type: Thesis or dissertation
Abstract: The luminescent solar concentrator is a planar, non-tracking device. Originally introduced more than three decades ago, it has yet to establish itself as a means of making photovoltaic solar energy more cost effective. Advances in organic luminescent centres, the emergence of inorganic nanocrystals and the development of new light trapping techniques have created promising opportunities for the LSC. This thesis investigates novel geometries and materials for the practical exploitation of LSCs. The research is based on experimental measurements as well as computational simulations using a Raytrace Model. It is shown both experimentally and computationally that a thin- lm structure produces the same effciency as a homogeneously doped LSC. Two building integrated applications are examined. The rst one is a power generating window employing a Lumogen Violet dye that absorbs short wavelength radiation and is mostly transparent in the visible. Annual yields of over 23 kWh/m2 and a conversion effciency of over 1% are predicted for a 50 cm by 50 cm device. The second BIPV application is the light-bar, which is designed to act as the secondary concentrator in a Venetian blind-like system. With linear Fresnel lenses producing a primary concentration factor of 20, an optimised system could generate nearly 60W/m^2 of power at an effciency of nearly 6% using direct sunlight only. Two novel luminescent materials, nanorods and phycobilisomes have been tested for their potential to reduce re-absorption losses. Despite current practical limitations, these materials are found to be promising due to enhanced Stokes shifts. LSCs with optical concentrations of 10 to 20 could be feasible by addressing the key shortcomings in the form of unabsorbed light and escape cone losses. Their versatility with regards to shape, colour and light absorption makes LSCs particularly relevant for building integrated photovoltaics.
Content Version: Imperial Users Only
Issue Date: May-2012
Date Awarded: Feb-2014
URI: http://hdl.handle.net/10044/1/23272
DOI: https://doi.org/10.25560/23272
Supervisor: Barnham, Keith
Chatten, Amanda
Department: Physics
Publisher: Imperial College London
Qualification Level: Doctoral
Qualification Name: Doctor of Philosophy (PhD)
Appears in Collections:Physics PhD theses

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