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Structural Optimization of a Line-Focussing Solar Collector With Stationary Absorber Tube

Prahl , Christoph and Schapitz, Tamara and Uhlig, Ralf (2011) Structural Optimization of a Line-Focussing Solar Collector With Stationary Absorber Tube. 17th SolarPACES Conference, 20. - 23. September 2011, Granada/Spain.

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A preliminary study on a line concentrating solar collector with stationary absorber tube has revealed significant cost reduction and performance enhancement compared to state-of-the-art Parabolic Trough Collectors. To decide whether this so called Fixed Focus Parabolic Trough concept is worth continuing, a pre-design of the concentrator structure for such a collector must be investigated. In this paper, the effects of operating conditions represented by wind forces and dead load on the shape accuracy of the concentrator are determined via finite element method (FEM). An optimization procedure written in ANSYS is applied to determine appropriate geometry and dimensions of the structure to obtain best optical performance at lowest material consumption. To maintain a mean focus deviation of the reflected rays from the focal line of less than 6 mm under operating conditions, a specific weight of 14 kg/m2 could be reached. As structural elements of the collector are located between mirror and absorber, ray tracing analysis is performed for one selected conceptual design to estimate the effects of blocking and shading on the optical performance. The ray tracing revealed a reduction of the optical performance due to blocking and shading of 27 % for an incidence angle of 45° compared to 0° incidence angle.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Structural Optimization of a Line-Focussing Solar Collector With Stationary Absorber Tube
AuthorsInstitution or Email of Authors
Prahl , Christophchristoph.prahl@dlr.de
Schapitz, TamaraUNSPECIFIED
Refereed publication:Yes
Keywords:line-concentrating solar collector, stationary absorber tube, optimization, FEM, ray tracing
Event Title:17th SolarPACES Conference
Event Location:Granada/Spain
Event Type:international Conference
Event Dates:20. - 23. September 2011
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Applikationsentwicklung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research
Deposited By: Christoph Prahl
Deposited On:15 Dec 2011 14:25
Last Modified:26 Jul 2013 17:57

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