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The effects of row spacing and ground clearance on the wind load of photovoltaic (PV) arrays

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  • Xu, Ang
  • Ma, Wenyong
  • Yuan, Huanxin
  • Lu, Lihe

Abstract

The accuracy of wind loads is vital for the security and economy of PV power stations. The majority of existing studies focus on the importance of the tilt angle, wind direction, and interference effect on PV modules. However, very few studies investigate the effects of row spacing and ground clearance on wind loads of PV arrays, which probably have considerable influences. The present study combines numerical simulations and wind tunnel tests to explore the impact of row spacing and ground clearance on wind loads. The results reveal that the row spacing considerably influences wind loads, and the influence of ground clearance is inconsiderable. Increasing row spacing notably diminishes the shielding effect of the windward row on subsequent ones. The second row experiences the most noticeable wind load variation when row spacing changes, with the amplitude of wind load variation in the second row being two to three-fold that of the third to eighth rows. The change of ground clearance varies the vortex size and form but exerts an inconsiderable influence on wind loads. The reduction factor is defined to describe the wind loads after the third row, which is suggested to be 0.7 for all tilt angles (β ≥ 15° or β ≤ - 15°) in row spacing from chord length to 5 times chord length in the practice. It should be noted that the wind load on the second row may change the direction at different row spacing. When the row spacing is between double and triple chord lengths, the pressure and torque coefficients obtain the minimum in the present study.

Suggested Citation

  • Xu, Ang & Ma, Wenyong & Yuan, Huanxin & Lu, Lihe, 2024. "The effects of row spacing and ground clearance on the wind load of photovoltaic (PV) arrays," Renewable Energy, Elsevier, vol. 220(C).
    • Handle: RePEc:eee:renene:v:220:y:2024:i:c:s0960148123015422
    DOI: 10.1016/j.renene.2023.119627
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    References listed on IDEAS

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    1. Bahrami, Arian & Okoye, Chiemeka Onyeka & Atikol, Ugur, 2017. "Technical and economic assessment of fixed, single and dual-axis tracking PV panels in low latitude countries," Renewable Energy, Elsevier, vol. 113(C), pages 563-579.
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    3. Winkelmann, Ulf & Kämper, Christoph & Höffer, Rüdiger & Forman, Patrick & Ahrens, Mark Alexander & Mark, Peter, 2020. "Wind actions on large-aperture parabolic trough solar collectors: Wind tunnel tests and structural analysis," Renewable Energy, Elsevier, vol. 146(C), pages 2390-2407.
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