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Linear Fresnel Collector Mirrors - Measured Systematic Surface Errors and their Impact on the Focal Line

: Heimsath, A.; Schöttl, P.; Bern, G.; Nitz, P.

Fulltext urn:nbn:de:0011-n-5652161 (2.4 MByte PDF)
MD5 Fingerprint: 19fba49a4f5f55d037dac54923e8d262
Copyright AIP
Created on: 30.11.2019

Richter, Christoph (Ed.):
SolarPACES 2018, 24th International Conference on Concentrating Solar Power and Chemical Energy Systems : 2-5 October 2018, Casablanca, Morocco
New York, N.Y.: AIP Press, 2019 (AIP Conference Proceedings 2126)
ISBN: 978-0-7354-1866-0
Art. 100003, 9 pp.
International Conference on Concentrating Solar Power and Chemical Energy Systems (SolarPACES) <24, 2018, Casablanca>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
Thermische Systeme und Gebäudetechnik; CSP; deflectometry; Linear Fresnel Collector; optical characterization; Solarthermische Kraftwerke und Industrieprozesse; konzentrierende Kollektoren

Objective of this article is to show and discuss the shape accuracy of solar reflector panels for linear Fresnel collectors. Systematic shape deviations due to torsion or orientation errors are responsible for severe optical losses and underperformance. This is why this article investigates systematic surface deviations beyond the standard quality parameters like SDx and FDy. We discuss typical characteristics of linear Fresnel collector reflector panels. Our measurement results show local surface slope deviations measured by deflectometry. In the second part of this study, the effect of systematic surface slope deviations is analyzed by use of a parametric model. We apply the model to detect systematic production errors, investigate optical losses and the impact on the focal line with ray tracing.