CFD analysis of convective heat transfer from ground mounted solar panels

The present study deals with the wind induced convective heat transfer from a ground mounted stand-alone solar panel using Reynolds-Averaged Navier–Stokes (RANS) simulation with Shear Stress Transport (SST) k–ω turbulence model. An unsteady solver with a steady inlet condition is employed. The numerical modeling approach is validated for wind flow field around the solar panel with a Particle Image Velocimetry (PIV) experiment performed in the boundary layer wind tunnel. The solar panel is subjected to two different wind directions (0° and 180°), and for each wind direction, three different incoming flows (wind speeds of 1, 5 and 10 m/s at 10 m height) are considered. The Convective Heat Transfer Coefficient (CHTC) distributions on the surfaces of the solar panel are analyzed with respect to the flow field around the solar panel. Similar CHTC distribution is observed on both windward and leeward surfaces of the solar panel where natural convection is dominant over forced convection. In contrast, where forced convection is dominant, higher CHTC values (up-to 128%) are found on the windward surfaces compared to the leeward surfaces of the panel. Relation between the dimensionless CHTC parameter Nusselt number (Nu) and the Reynolds number (Re) are presented and the results are compared with previous existing correlations. The lowest Re case (1.0 × 105), which produces the maximum panel surface temperature and thus will result in minimum electrical efficiency of the panel, is identified to be the most critical case in this study.

[1]  Robert J. Moffat,et al.  Heat transfer with very high free stream turbulence , 1985 .

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

[3]  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 .

[4]  J. Carmeliet,et al.  Convective heat transfer coefficients for exterior building surfaces: Existing correlations and CFD modelling , 2011 .

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

[6]  Dominique Derome,et al.  High-resolution CFD simulations for forced convective heat transfer coefficients at the facade of a low-rise building , 2009 .

[7]  R. J. Kind,et al.  Convective Heat Losses From Flat-Plate Solar Collectors in Turbulent Winds , 1983 .

[8]  Jane H. Davidson,et al.  A model and heat transfer correlation for rooftop integrated photovoltaics with a passive air cooling channel , 2009 .

[9]  E. Skoplaki,et al.  ON THE TEMPERATURE DEPENDENCE OF PHOTOVOLTAIC MODULE ELECTRICAL PERFORMANCE: A REVIEW OF EFFICIENCY/ POWER CORRELATIONS , 2009 .

[10]  Steve Sharples,et al.  Full-scale measurements of wind-induced convective heat transfer from a roof-mounted flat plate solar collector , 1998 .

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

[12]  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 .

[13]  Frank P. Incropera,et al.  Fundamentals of Heat and Mass Transfer , 1981 .

[14]  J. Palyvos.  A survey of wind convection coefficient correlations for building envelope energy systems’ modeling , 2008 .

[15]  K. K. Tien,et al.  Forced Convection Heat Transfer at an Inclined and Yawed Square Plate—Application to Solar Collectors , 1977 .

[16]  Gl Larose,et al.  On the Reynolds number sensitivity of the aerodynamics of bluff bodies with sharp edges , 2006 .

[17]  P. Bradshaw,et al.  Effect of Free-Stream Turbulence on Heat Transfer through a Turbulent Boundary Layer , 1978 .

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

[19]  S. Shakerin.  Wind-Related Heat Transfer Coefficient for Flat-Plate Solar Collectors , 1987 .

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

[21]  P. Maciejewski,et al.  Heat Transfer With Very High Free-Stream Turbulence: Part II—Analysis of Results , 1992 .

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

[23]  A. Johary,et al.  Heat Transfer During Wind Flow over Rectangular Bodies in the Natural Environment , 1981 .

[24]  D. L. Evans,et al.  Simplified method for predicting photovoltaic array output , 1980 .

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