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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, Karin and Ifland, David and Rebholz, Christian (2008) Solar Concentrating Systems Using Small Mirror Arrays. In: Proc. ES2008 (ES2008-54347), pp. 1-5. Energy Sustainability 2008, 2008-08-10 - 2008-08-14, Jacksonville, FL (USA).

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Abstract

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 heliostats1 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 10 cm x 10 cm) have to be used which are placed in a box with transparent cover. Innovative drive systems are developed in order to obtain a cost-effective design. A 0.5 m x 0.5 m 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 divergence less than 4 mrad.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Solar Concentrating Systems Using Small Mirror Arrays
Authors:
AuthorsInstitution or Email of Authors
Göttsche, JoachimSolar-Institut Jülich
Hoffschmidt, BernhardSolar-Institut Jülich
Schmitz, StefanSolar-Institut Jülich
Sauerborn, MarkusSolar-Institut Jülich
Buck, ReinerUNSPECIFIED
Teufel, EdgarUNSPECIFIED
Badstübner, KarinFraunhofer-IZM
Ifland, DavidFraunhofer-IZM
Rebholz, ChristianFraunhofer-IZM
Date:August 2008
Journal or Publication Title:Proc. ES2008
Refereed publication:Yes
In ISI Web of Science:No
Page Range:pp. 1-5
Editors:
EditorsEmail
ASME, UNSPECIFIED
Status:Published
Keywords:heliostat, small mirror array, solar tower, solar power, field layout
Event Title:Energy Sustainability 2008
Event Location:Jacksonville, FL (USA)
Event Type:international Conference
Event Dates:2008-08-10 - 2008-08-14
Organizer:ASME
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:28 Jan 2009
Last Modified:27 Apr 2009 15:46

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