Abstract
This study investigated high-frequency load fluctuations on a rectangular heliostat model in a boundary layer wind tunnel experiment. Statistical methods for peak wind load predictions were compared with load distributions through load cell and surface pressure measurements on the heliostat model placed in two simulated atmospheric boundary layers (ABLs) representing a flat desert terrain and open country terrain. It was found that statistical peak predictions based on horizontal wind gust velocity amplitude underestimates the load coefficients in stow and at oblique azimuth angles for maximum azimuth moments. In addition, it was shown that the distributions of the centre of pressure position and the hinge moment in stow position are non-Gaussian. It is therefore recommended that the frequency and amplitude of the vertical wind velocity component must be considered for peak load predictions of hinge moments and azimuth moments.
Funder
Australian Renewable Energy Agency
Reference8 articles.
1. J. A. Peterka and R. G. Derickson, Wind load design methods for ground-based heliostats and parabolic dish collectors (Sandia National Laboratories, Albuquerque, New Mexico, 1992), SAND92-7009. https://doi.org/10.2172/7105290
2. M. Emes, A. Jafari and M. Arjomandi, Wind load design considerations for the elevation and azimuth drives of a heliostat, AIP Conference Proceedings 2303, 030013 (2020). https://doi.org/10.1063/5.0028609
3. M. J. Emes, A. Jafari, J. Coventry and M. Arjomandi, The influence of atmospheric boundary layer turbulence on the design wind loads and cost of heliostats, Solar Energy 207, 796-812 (2020). https://doi.org/10.1016/j.solener.2020.07.022
4. E. Simiu and R. H. Scanlan, Wind effects on structures: fundamentals and applications to design, John Wiley & Sons, 1996.
5. N. J. Cook, Designers guide to wind loading of building structures. Part 1, 1986.