A numerical approach to the investigation of wind loading on an array of ground mounted solar photovoltaic (PV) panels

Abstract Aerodynamic loads on, and wind flow field around, an array of ground mounted solar photovoltaic (PV) panels, immersed in the atmospheric boundary layer (ABL) for open country exposure, are investigated using the unsteady Reynolds-Averaged Navier–Stokes (RANS) approach. A full scale three-dimensional (3D) solver from OpenFOAM ® (ESI Group) is employed with the Shear Stress Transport (SST) k–ω turbulence closure. Several azimuthal wind directions (South, 0°; Southwest, 45°; Northwest, 135° and North, 180°), for a Reynolds number of 3×10 6 , are considered. The numerical modeling approach is validated by comparing the velocity field surrounding a ground mounted stand-alone solar panel with wind tunnel experiments. Detail analysis of wind loading on the array is provided in relation to the wind flow field surrounding the array. The results for the array configuration show that all the trailing rows are in the complete wake of the leading row for straight winds (0° and 180°), but not for oblique winds (45° and 135°). For all four wind directions studied here, the first windward row experiences the maximum wind loads in terms of drag and lift. In terms of the maximum overturning moment, the 45° and 135° wind directions are critical with similar overturning moment coefficients for each row.

[1]  Adrian Radu,et al.  Steady wind pressures on solar collectors on flat-roofed buildings , 1986 .

[2]  Kenny C. S Kwok,et al.  Wind loads on industrial solar panel arrays and supporting roof structure , 2001 .

[3]  Theodore Stathopoulos,et al.  Local and Overall Wind Pressure and Force Coefficients for Solar Panels , 2014 .

[4]  A. Radu,et al.  Wind forces on structures supporting solar collectors , 1989 .

[5]  P. Spalart.  Comments on the feasibility of LES for wings, and on a hybrid RANS/LES approach , 1997 .

[6]  Robert N. Meroney,et al.  Wind effects on roof-mounted solar photovoltaic arrays: CFD and wind-tunnel evaluation , 2010 .

[7]  Jon Galsworthy,et al.  Wind loading on tilted roof-top solar arrays: The parapet effect , 2013 .

[8]  Kung-Ming Chung,et al.  Wind loads on residential and large-scale solar collector models , 2011 .

[9]  P. Roache.  Perspective: A Method for Uniform Reporting of Grid Refinement Studies , 1994 .

[10]  D. K. Zimmerman,et al.  Wind loads on flat-plate photovoltaic-array fields (nonsteady winds). Phase IV. Final report , 1979 .

[11]  Murray J. Morrison,et al.  Aerodynamic mechanisms for wind loads on tilted, roof-mounted, solar arrays , 2012 .

[12]  Yukio Tamura,et al.  Wind loading characteristics of solar arrays mounted on flat roofs , 2013 .

[13]  Eric Savory,et al.  Numerical modelling of forced convective heat transfer from the inclined windward roof of an isolated low-rise building with application to photovoltaic/thermal systems , 2011 .

[14]  A. Gosman,et al.  Solution of the implicitly discretised reacting flow equations by operator-splitting , 1986 .

[15]  Arindam Gan Chowdhury,et al.  Influence of spacing parameters on the wind loading of solar array , 2014 .

[16]  Freyr Sverrisson,et al.  Renewables 2014 : global status report , 2014 .

[17]  N. Null.  Minimum Design Loads for Buildings and Other Structures , 2003 .

[18]  David Surry,et al.  Wind loads on a solar array , 2002 .

[19]  T. Stathopoulos,et al.  CFD simulation of the atmospheric boundary layer: wall function problems , 2007 .

[20]  David Banks,et al.  Use of the Wind Tunnel Test Method for Obtaining Design Wind Loads on Roof-Mounted Solar Arrays , 2013 .

[21]  H. Tieleman.  Wind tunnel simulation of wind loading on low-rise structures: a review , 2003 .

[22]  Aly Mousaad Aly,et al.  Aerodynamics of Ground Mounted Solar Panels: Test Model Scale Effects , 2013 .

[23]  Girma Bitsuamlak,et al.  Evaluation of wind loads on solar panel modules using CFD , 2010 .

[24]  Jörg Franke,et al.  The COST 732 Best Practice Guideline for CFD simulation of flows in the urban environment: a summary , 2011 .

[25]  Horia Hangan,et al.  Experimental investigation of wind effects on a standalone photovoltaic (PV) module , 2015 .

[26]  Kung-Ming Chung,et al.  Reduction of wind uplift of a solar collector model , 2008 .

[27]  ShademanM.,et al.  Numerical simulation of wind loading on ground-mounted solar panels at different flow configurations , 2014 .

[28]  Aly Mousaad Aly,et al.  Wind-Induced Pressures on Solar Panels Mounted on Residential Homes , 2014 .

[29]  F. Menter.  Two-equation eddy-viscosity turbulence models for engineering applications , 1994 .

[30]  David Banks,et al.  The role of corner vortices in dictating peak wind loads on tilted flat solar panels mounted on large, flat roofs , 2013 .

[31]  Eric Savory,et al.  Effect of incident flow conditions on convective heat transfer from the inclined windward roof of a low-rise building with application to photovoltaic-thermal systems , 2012 .

[32]  Horia Hangan,et al.  Numerical simulation of wind effects on a stand-alone ground mounted photovoltaic (PV) system , 2014 .

[33]  Gregory A. Kopp,et al.  Velocity measurements around low-profile, tilted, solar arrays mounted on large flat-roofs, for wall normal wind directions , 2013 .