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Analysis of high concentration passively cooled CPV module designs using mirror optics

: Dreger, M.; Wiesenfarth, M.; Schmid, T.; Bett, A.W.

Fulltext urn:nbn:de:0011-n-2798625 (652 KByte PDF)
MD5 Fingerprint: 4498c818d97d01b83c7b18a5a8c066f8
Created on: 1.5.2015

Mine, A. ; European Commission:
28th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2013. Proceedings. DVD-ROM : 30 September to 04 October 2013, Paris, France
München: WIP-Renewable Energies, 2013
ISBN: 3-936338-33-7
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <28, 2013, Paris>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
Materialien - Solarzellen und Technologie; III-V und Konzentrator-Photovoltaik; Konzentrator-Bauelemente; Konzentrator-Optik; Hochkonzentrierende Systeme (HCPV); Module; design; optics; cooling; management

In high concentrating photovoltaic (HCPV) modules the solar radiation is focused on high efficient multi-junction solar cells. One option to distinguish between different system approaches is the applied optics. For example, Frensel lenses or parabolic mirrors can be used as primary optics. Another aspect of the module design is how the thermal energy is distributed. There are actively and passively cooled systems. In any case, the way of thermal management is essential for the high performance of the system. In this paper passively cooled systems with mirrors as primary optics are investigated. Different designs of modules with on-axis, off-axis and Cassegrain optics were chosen and evaluated in terms of thermal management, optical efficiency, acceptance angle and manufacturing efforts. For the analysis of the optical and thermal behavior, ray tracing and FEM simulations were applied. In terms of temperature of the solar cell the Cassegrain design has the lowest operating temperature as the heat spreader does not shade the primary optics and can be generously dimensioned. Comparing the acceptance angle and the optical efficiency a special on-axis design with the heat spreader assembled inside of the module performs best.