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Investigation of peak wind loads on tandem heliostats in stow position

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  • Emes, Matthew J.
  • Ghanadi, Farzin
  • Arjomandi, Maziar
  • Kelso, Richard M.

Abstract

This paper investigates the effects of turbulence in the atmospheric boundary layer (ABL) on the peak wind loads on heliostats in stow position in isolation and in tandem configurations with respect to the critical scaling parameters of the heliostats. The heliostats were exposed to a part-depth ABL in a wind tunnel using two configurations of spires and roughness elements to generate a range of turbulence intensities and integral length scales. Force measurements on different-sized heliostat mirrors at a range of heights found that both peak lift and hinge moments were reduced by up to 30% on the second tandem heliostat when the spacing between the heliostat mirrors was close to the mirror chord length and converged to the isolated heliostat values when the spacing was greater than 5 times the chord length. Peak wind loads on the tandem heliostat were above those on an isolated heliostat for an integral-length-scale-to-chord-length ratio Lux/c of less than 5, whereas tandem loads were 30% lower than an isolated heliostat at Lux/c of 10. The reduced loads on the tandem heliostat corresponded to a shift to higher frequencies of the fluctuating pressure spectra, due to the break-up of large eddies by the upstream heliostat.

Suggested Citation

  • Emes, Matthew J. & Ghanadi, Farzin & Arjomandi, Maziar & Kelso, Richard M., 2018. "Investigation of peak wind loads on tandem heliostats in stow position," Renewable Energy, Elsevier, vol. 121(C), pages 548-558.
    • Handle: RePEc:eee:renene:v:121:y:2018:i:c:p:548-558
    DOI: 10.1016/j.renene.2018.01.080
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    References listed on IDEAS

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    1. Hinkley, James T. & Hayward, Jennifer A. & Curtin, Bryan & Wonhas, Alex & Boyd, Rod & Grima, Charles & Tadros, Amir & Hall, Ross & Naicker, Kevin, 2013. "An analysis of the costs and opportunities for concentrating solar power in Australia," Renewable Energy, Elsevier, vol. 57(C), pages 653-661.
    2. Gong, Bo & Wang, Zhifeng & Li, Zhengnong & Zang, Chuncheng & Wu, Zhiyong, 2013. "Fluctuating wind pressure characteristics of heliostats," Renewable Energy, Elsevier, vol. 50(C), pages 307-316.
    3. Gong, Bo & Li, Zhengnong & Wang, Zhifeng & Wang, Yingge, 2012. "Wind-induced dynamic response of Heliostat," Renewable Energy, Elsevier, vol. 38(1), pages 206-213.
    4. Peterka, J.A. & Bienkiewicz, B. & Hosoya, N. & Cermak, J.E., 1987. "Heliostat mean wind load reduction," Energy, Elsevier, vol. 12(3), pages 261-267.
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    1. Ji, Baifeng & Xiong, Qian & Xing, Panpan & Qiu, Penghui, 2022. "Dynamic response characteristics of heliostat under hail impacting in Tibetan Plateau of China," Renewable Energy, Elsevier, vol. 190(C), pages 261-273.

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