Mr. Alex G. Lehmann Profile

Alex G. Lehmann

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Proceedings Article | 9 September 2019 Presentation + Paper

Numerical flowline concentrator design in 3D

Alex Lehmann, Nicholas Ekins-Daukes, Mark Keevers

Proceedings Volume 11120, 111200A (2019) https://doi.org/10.1117/12.2526849

KEYWORDS: Solar concentrators, Receivers, Light sources, Numerical analysis, Freeform optics, Shape analysis, Signal attenuation, Reflection, Photovoltaics, Reflectors

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Freeform optics has great potential for delivering highly effective solar concentrators and lighting systems, but in some cases it can be challenging to implement. A numerical method is described for calculating 3D flowline concentrator shapes in a way that provides complete freedom over the specification of arbitrary source and receiver objects. This lends the approach to a range of practical design problems involving asymmetric systems, non-lambertian and extended light sources. The method reproduces the hyperbolic and hyperparabolic concentrator geometries identified in the literature, operating close to the thermodynamic limit of concentration. A practical example is given in the optimisation of a secondary concentrator for a concentrator photovoltaic array receiving light from a field of heliostats. The secondary improves the overall capture efficiency of the photovoltaic receiver at noon, and is expected to deliver further improvement at other times of day.

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