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Potential gain through implementation of astigmatic corrected heliostats

: Rooyen, W. van de; Schöttl, P.; Bern, G.; Heimsath, A.; Nitz, P.; Dinter, F.; Harms, T.M.

Fulltext urn:nbn:de:0011-n-4589396 (401 KByte PDF)
MD5 Fingerprint: 2d534a824e4ad5136f914af8d6b7beea
Created on: 11.8.2017

Univ. of Stellenbosch:
4th Southern African Solar Energy Conference, SASEC 2016 : 31st October to the 2nd of November 2016, Stellenbosch, South Africa
Stellenbosch, 2016
ISBN: 978-0-7972-1658-7
4 pp.
Southern African Solar Energy Conference (SASEC) <4, 2016, Stellenbosch>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
Solarthermie und Optik; Solarthermie; Thermische Kollektoren und Komponenten; Heliostat; astigmatism; receiver system; solar power

Heliostats in a central receiver system (CRS) field used for concentrated solar power (CSP) experience a range of incidence angles during operation. The thus incurring astigmatism inflicts optical losses and reduces solar concentration through enlarging the focal spot at the receiver. A heliostat can theoretically be continuously astigmatism free if the shape of the concentrator/reflector is continuously adapted to the occurring incidence angle. In order to show the potential optical benefits of such an implementation, raytracing simulations were performed with models using both conventional and astigmatic-corrected heliostats. We show that the implementation of the astigmatic corrected heliostat allows a reduction in receiver aperture at equal optical yield as compared to conventional heliostats (heliostats with constant focus), and which heliostats in a field are affected most by astigmatism.