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Wind loads on heliostats and photovoltaic trackers at various Reynolds numbers

Pfahl, Andreas and Uhlemann, Heiko (2011) Wind loads on heliostats and photovoltaic trackers at various Reynolds numbers. Journal of Wind Engineering and Industrial Aerodynamics, 99 (9), 964 bis 968. DOI: 10.1016/j.jweia.2011.06.009. ISSN 0167-6105.

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Wind loads on heliostats are usually determined at boundary layer, low-speed wind tunnels at which the design full-scale Reynolds number cannot be reached. In doing so, it is supposed the wind load coefficients are Reynolds number independent, which is known to be the case for sharp edged bodies. But for the stow position the usually round torque tube is directly exposed to the wind and could influence the wind loads. By measurements in a high-pressure wind tunnel, it can be demonstrated that the design-relevant wind load coefficients are not Reynolds number dependent. However, the inclination of the mirror plane in stow position, due to the deflection of the heliostats structure at high Reynolds number, leads to increased wind loads and must be considered. The results are also valid for photovoltaic trackers of similar shape.

Document Type:Article
Title:Wind loads on heliostats and photovoltaic trackers at various Reynolds numbers
AuthorsInstitution or Email of Authors
Pfahl, AndreasSF-PN ST
Uhlemann, HeikoHeiko.Uhlemann@dnw-germany.aero
Date:September 2011
Journal or Publication Title:Journal of Wind Engineering and Industrial Aerodynamics
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:964 bis 968
Keywords:heliostat, PV tracker, wind load, Reynolds number, high pressure wind tunnel, central receiver, solar tower, concentrated solar power, solar thermal
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 Solar Research
Deposited By: Andreas Pfahl
Deposited On:16 Dec 2011 17:00
Last Modified:25 Nov 2014 15:33

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