In standard heliostat design, the usual strategy of cost reduction is to increase the mirror area of the heliostats. This not only leads to a reduction of specific drive cost but also to an increase of the torques caused by the wind loads, resulting in higher specific weight and higher specific drive power. These drawbacks are avoided when small heliostats are coupled. At the torque tube heliostat (TTH), the mirrors are mounted on torque tubes to simplify the coupling mechanism for the elevation angle. Ray tracing calculations were done to obtain optimized heliostat configurations and to compare the energy yield of a heliostat field built of TTHs with a conventional heliostat field. To get an idea of the weight reduction potential of the TTH, the dimensions of the torque tubes, the secondary axis tubes, and the mirror support structure were weight optimized via finite element method. The layout criterion was a mean mirror error of under wind load and gravity.
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February 2008
Research Papers
Optical Performance and Weight Estimation of a Heliostat With Ganged Facets
L. Amsbeck,
L. Amsbeck
German Aerospace Center (DLR),
e-mail: lars.amsbeck@dlr.de
Institute of Technical Thermodynamics
, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany
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R. Buck,
R. Buck
German Aerospace Center (DLR),
Institute of Technical Thermodynamics
, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany
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A. Pfahl,
A. Pfahl
German Aerospace Center (DLR),
Institute of Technical Thermodynamics
, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany
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R. Uhlig
R. Uhlig
German Aerospace Center (DLR),
Institute of Technical Thermodynamics
, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany
Search for other works by this author on:
L. Amsbeck
German Aerospace Center (DLR),
Institute of Technical Thermodynamics
, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germanye-mail: lars.amsbeck@dlr.de
R. Buck
German Aerospace Center (DLR),
Institute of Technical Thermodynamics
, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany
A. Pfahl
German Aerospace Center (DLR),
Institute of Technical Thermodynamics
, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany
R. Uhlig
German Aerospace Center (DLR),
Institute of Technical Thermodynamics
, Pfaffenwaldring 38-40, D-70569 Stuttgart, GermanyJ. Sol. Energy Eng. Feb 2008, 130(1): 011010 (3 pages)
Published Online: December 28, 2007
Article history
Received:
October 27, 2006
Revised:
August 29, 2007
Published:
December 28, 2007
Citation
Amsbeck, L., Buck, R., Pfahl, A., and Uhlig, R. (December 28, 2007). "Optical Performance and Weight Estimation of a Heliostat With Ganged Facets." ASME. J. Sol. Energy Eng. February 2008; 130(1): 011010. https://doi.org/10.1115/1.2804630
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