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Solar Concentrating Systems Using Small Mirror Arrays

Göttsche, Joachim and Hoffschmidt, Bernhard and Schmitz, Stefan and Sauerborn, Markus and Buck, Reiner and Teufel, Edgar and Badstübner, Kathrin and Ifland, David and Rebholz, Christian (2010) Solar Concentrating Systems Using Small Mirror Arrays. Journal of Solar Energy Engineering, 132 (1), pp. 110031-110034. ASME. DOI: 10.1115/1.4000332. ISSN 0199-6231.

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The cost of solar tower power plants is dominated by the heliostat field making up roughly 50% of investment costs. Classical heliostat design is dominated by mirrors brought into position by steel structures and drives that guarantee high accuracies under wind loads and thermal stress situations. A large fraction of costs is caused by the stiffness requirements of the steel structure, typically resulting in 20 kg/m2 steel per mirror area. The typical cost figure of heliostats is currently in the area of 150 € /m2 caused by the increasing price of the necessary raw materials. An interesting option to reduce costs lies in a heliostat design where all moving parts are protected from wind loads. In this way, drives and mechanical layout may be kept less robust, thereby reducing material input and costs. In order to keep the heliostat at an appropriate size, small mirrors (around 10x10 cm2) have to be used, which are placed in a box with a transparent cover. Innovative drive systems are developed in order to obtain a cost-effective design. A 0.5x0.5 m2 demonstration unit will be constructed. Tests of the unit are carried out with a high-precision artificial sun unit that imitates the sun’s path with an accuracy of less than 0.5 mrad and creates a beam of parallel light with a divergence of less than 4 mrad.

Document Type:Article
Title:Solar Concentrating Systems Using Small Mirror Arrays
AuthorsInstitution or Email of Authors
Göttsche, JoachimSIJ
Hoffschmidt, BernhardSIJ
Schmitz, StefanSIJ
Sauerborn, MarkusSIJ
Buck, ReinerDLR
Teufel, EdgarDLR
Badstübner, KathrinFraunhofer IZM
Ifland, DavidFraunhofer IZM
Rebholz, ChristianFraunhofer IZM
Date:February 2010
Journal or Publication Title:Journal of Solar Energy Engineering
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 110031-110034
Keywords:Heliostat, Solarkraftwerk
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 - Solare Hochtemperatursysteme (old)
Location: Stuttgart
Institutes and Institutions:Institute of Technical Thermodynamics > Solar Research
Deposited By: Dr.-Ing. Reiner Buck
Deposited On:20 Jan 2011 10:16
Last Modified:26 Mar 2013 13:26

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