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Light concrete shells for parabolic trough collectors – Conceptual design, prototype and proof of accuracy

Forman, P. and Müller, S. and Ahrens, M.A. and Schnell, J. and Mark, P. and Höffer, R. and Hennecke, Klaus and Krüger, J. (2015) Light concrete shells for parabolic trough collectors – Conceptual design, prototype and proof of accuracy. Solar Energy (111), pp. 364-377. Elsevier. ISSN 0038-092X

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1016/j.solener.2014.11.002

Abstract

Up to now modules of parabolic trough collectors are usually made from steel frames carrying curved mirror elements. With these, the crucial disadvantage is the separation between supporting structure and reflecting surface. Here, the independent parts are merged to a very thin and light-weight but solid concrete shell having a highly precise inner surface that serves as substrate for mirror elements. Since concrete is originally very brittle and weak in tension, a special high-strength concrete with remarkable tensile strength is developed. Based on numerical analyses employing linear elastic material behaviour and limiting stresses below the tensile strength, two alternative module candidates have been designed with geometries close to already existent modules. Their design accounts for operation states by means of analytically and experimentally derived actions and constraints as well as time-dependent material effects. A first prototype on novel concrete supports demonstrates general feasibility. Highly accurate surfaces of the concrete shell, having a few centimetres of thickness only, prove structural stiffness and full optical efficiency in tests employing digital close range photogrammetry and analytically derived precision rates based on the surface slope error.

Item URL in elib:https://elib.dlr.de/101266/
Document Type:Article
Title:Light concrete shells for parabolic trough collectors – Conceptual design, prototype and proof of accuracy
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Forman, P.Ruhr-Universität BochumUNSPECIFIED
Müller, S.TU KaiserslauternUNSPECIFIED
Ahrens, M.A.Ruhr-Universität BochumUNSPECIFIED
Schnell, J.TU KaiserslauternUNSPECIFIED
Mark, P.Ruhr-Universität BochumUNSPECIFIED
Höffer, R.Ruhr-Universität BochumUNSPECIFIED
Hennecke, Klausklaus.hennecke (at) dlr.deUNSPECIFIED
Krüger, J.Solarlite CSP Technology GmbHUNSPECIFIED
Date:2015
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Page Range:pp. 364-377
Publisher:Elsevier
ISSN:0038-092X
Status:Published
Keywords:Parabolic trough; Slope error; Wind loads; High-strength concrete; Shell structures; Photogrammetry
HGF - Research field:Energy
HGF - Program:other
HGF - Program Themes:E - no assignment
DLR - Research area:Energy
DLR - Program:E - no assignment
DLR - Research theme (Project):E - no assignment
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Linienfokussierende Systeme
Deposited By: Hennecke, Klaus
Deposited On:17 Dec 2015 14:07
Last Modified:10 May 2016 23:39

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