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Analysis of Drift Phenomena in Heliostat Images

[+] Author Affiliations
Martha Escobar-Toledo, Camilo A. Arancibia-Bulnes, Manuel I. Peña-Cruz, Claudio A. Estrada

Universidad Nacional Autonoma de Mexico, Temixco, MOR, Mexico

David Riveros-Rosas

Universidad Nacional Autonoma de Mexico, Mexico, DF, Mexico

Rodolfo Peón-Anaya, Cuitlahuac Iriarte-Cornejo, Rafael E. Cabanillas

Universidad de Sonora, Hermosillo, SON, Mexico

Paper No. ES2012-91187, pp. 385-392; 8 pages
doi:10.1115/ES2012-91187
From:
  • ASME 2012 6th International Conference on Energy Sustainability collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology
  • ASME 2012 6th International Conference on Energy Sustainability, Parts A and B
  • San Diego, California, USA, July 23–26, 2012
  • Conference Sponsors: Advanced Energy Systems Division, Solar Energy Division
  • ISBN: 978-0-7918-4481-6
  • Copyright © 2012 by ASME

abstract

Heliostat image drift is defined as the wandering of the irradiance spot produced by a heliostat on a receiver or observation screen. Two factors producing heliostat image drift have been analyzed theoretically in the present paper: errors in reference position, and time delay. Some regular behavior is found in the drift curves. Maximum deviations from target tend to be linearly dependent with either angular error, or time delay. In particular, the curves produced by this later effect are circular or elliptical. Heliostats at different distances from a tower have been analyzed. For heliostats far from the tower the drift curves due to errors in reference position also have a more or less elliptical shape. Results are presented as dimensionless quantities. Some practical implications of these results are discussed.

Copyright © 2012 by ASME
Topics: Delays , Errors , Shapes

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