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Dimensioning of Heliostat Components under Wind and Gravity Load: the Map Approach

Teufel, Edgar and Buck, Reiner and Pfahl, Andreas and Böing, Georg and Kunert, Jens (2008) Dimensioning of Heliostat Components under Wind and Gravity Load: the Map Approach. In: Conference Proceedings. 14th Biennial CSP SolarPACES Symposium, 2008-03-04 - 2008-03-07, Las Vegas, Nevada (USA).

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Abstract

Estimating annual optical performance of heliostats under realistic load is computationally very expensive as complex structural deformation and ray tracing calculations are necessary. An approach is presented that vastly accelerates these calculations by using pre-calculated multidimensional maps derived from a limited number of precisely computed grid points through linear interpolation. Structural maps represent mirror misalignment as a function of wind velocity, direction and gravity. Power maps contain the intercepted power of a heliostat given its position in the field, mirror misalignment and the current sun position. The maps are generated based on specific assumptions about the tower and receiver dimensions as well as heliostat dimensions and on simple experimental investigations as for the drive properties. An estimation of the annual energy yield is obtained by integrating current intercepted power values chronologically for a given heliostat field configuration. For this purpose, representative time series for weather data (direct normal insolation, wind velocity and direction) are generated artificially. The misalignment of mirrors is calculated from wind loads taking into account wind shading effects. By applying this method to different drive configurations, the impact on the annual yield under wind loads can be rapidly identified. Thus, the method allows easy assessment of drive and other component modifications and therefore can be helpful in reducing specific costs. Results of this method are presented, using a specific heliostat design as reference. A drive train with typical stiffness properties is compared to an ideally stiff one. It is found that the method works in that it provides plausible results within reasonable computing time. Future extensions of the tool to include backlash and other drive effects are briefly described.

Document Type:Conference or Workshop Item (Paper)
Title:Dimensioning of Heliostat Components under Wind and Gravity Load: the Map Approach
Authors:
AuthorsInstitution or Email of Authors
Teufel, EdgarUNSPECIFIED
Buck, ReinerUNSPECIFIED
Pfahl, AndreasUNSPECIFIED
Böing, GeorgSiemens Geared Motors GmbH
Kunert, JensSiemens Geared Motors GmbH
Date:March 2008
Journal or Publication Title:Conference Proceedings
Refereed publication:No
In ISI Web of Science:No
Status:Published
Keywords:heliostat, drive, wind load, weather data, annual yield, optical performance, central receiver solar tower plants
Event Title:14th Biennial CSP SolarPACES Symposium
Event Location:Las Vegas, Nevada (USA)
Event Type:international Conference
Event Dates:2008-03-04 - 2008-03-07
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. Edgar Teufel
Deposited On:13 Jan 2009
Last Modified:12 Dec 2013 20:30

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