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IJSTR >> Volume 3- Issue 12, December 2014 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Numerical Study Of Natural Convection Through A Photovoltaic-Thermal (PV/T) Building Solar Chimney Suitable For Natural Cooling

[Full Text]



A. Ndiho, K. N’wuitcha, H.A. Samah, M. Banna



Index Terms: Fluid flow, convective heat transfer, transparent photovoltaic (PV), building solar chimney, simulation



Abstract: Transient mixed convective airflow in a novel Building Solar Chimney, designed in connecting together, as a single device, a Photovoltaic/Thermal (PV/T) collector with transparent PV cells as active wall and a solar thermal flat-plate collector, has been analyzed numerically using a stream function, vorticity formulation and employing a finite difference scheme. The Photovoltaic-Thermal Building Solar Chimney could not only generate electricity but also achieve potential energy saving by the reduction of the air conditioning cooling loads when it is applied in tropical climate conditions. The results are presented in the form of streamlines, isotherm contours, local Nusselt number, mass air flow characteristics and the dimensionless temperature. The effects of Grashof and Reynolds numbers and the geometrical parameters on the performances of the Building Solar Chimney are presented and analyzed. Based on the resulting numerical prediction, it is found that the Photovoltaic/Thermal Building Solar Chimney (PV/T-BSC) model offers a good electrical efficiency while Photovoltaic/Thermal Reverse Building Solar Chimney (PV/T-RBSC) collector offers a good thermal efficiency. Finally, the results showed that no Building Solar Chimney studied can simultaneously provide good electrical and thermal efficiency.



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