Publication: Building-integrated Photovoltaic/Thermal systems â numerical prediction of exterior convective heat transfer coefficients and parametric analysis
All || By Area || By Year| Title | Building-integrated Photovoltaic/Thermal systems â numerical prediction of exterior convective heat transfer coefficients and parametric analysis | Authors/Editors* | C M Jubayer, P Karava, E Savory |
|---|---|
| Where published* | Int High Performance Buildings Conf, Purdue University, July |
| How published* | Proceedings |
| Year* | 2010 |
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| Number | |
| Pages | |
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| Keywords | Photovoltaic systems, convective heat transfer, buildings, wind |
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| Abstract |
The wind-induced exterior convective heat transfer coefficients (CHTC) for a photovoltaic/thermal (PV/T) system mounted on the windward 30 degree roof slope of a low-rise building have been computed using high resolution 3-D steady RANS with the Realizable k-epsilon (R k-epsilon) and the Shear Stress Transport k-omega (SST k-omega) turbulence models, as well as unsteady RANS with the SST k-omega turbulence closure. For validation purposes a 1:50 scale model of the building, with full-scale plan dimension of 4.2 m x 6 m and a 3 m roof height, was tested in a boundary layer wind tunnel. Results for the wind direction normal to the eaves show that the SST k-omega turbulence closure performed better than the R k-epsilon model in terms of matching the model-scale wind tunnel velocity profiles over the windward roof. A parametric analysis has been performed for different Reynolds numbers (1.3x10^5 to 7.7x10^5), based on wind speed at eaves height and roof length, using the SST k-omega turbulence model. A correlation has been developed for exterior CHTC, using dimensionless parameters, and compared with results from previous full-scale experiments as well as with boundary layer theory. |
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