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NATURAL CONVECTION IN A NONUNIFORMLY HEATED CHANNEL WITH APPLICATION TO PHOTOVOLTAIC FACADES

Volume 1, Issue 3, 2009, pp. 231-258
DOI: 10.1615/ComputThermalScien.v1.i3.10
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ABSTRACT

This paper investigates an active component of the building envelope: a photovoltaic-thermal double-skin facade. This element consists of a vertical open air channel bound by two parallel walls: one is made of photovoltaic panels and one is the main frame of the building. Integrating this system in a building facade is not an easy matter because the electrical output is strongly dependent on the operating temperature of the photovoltaic component. The aim of this study is to promote better cooling of the photovoltaic facade working on its typical geometrical arrangement. This consists of an alternation of photovoltaic cells (localized heat sources) and semitransparent window panes (unheated zones). Fundamentally, the flow of natural convection that develops within the vertical channel appears to be subjected to boundary-localized thermally active areas and adiabatic areas, evenly distributed throughout the height. This requires investigations of parametric variations of magnitude and space frequency of the heated areas as well as intermediate spacing. Two complementary experimental apparatuses were developed, namely, at CETHIL and at the CFD Research Laboratory UNSW in collaboration with the DIPTEM. Experiments were conducted on both. For these experiments, Grashof numbers, based on the channel width and the convective heat flux, are about 1010. The results obtained constitute an important database, which allows characterization of convective heat transfer. Some of the results concern the dynamic boundary conditions that are required for the numerical investigation. The present study compares (on a common operating range) both experimental and numerical investigations focusing on the CETHIL experiments.

CITED BY
  1. Lau G.E., Yeoh G.H., Timchenko V., Yueen R.K.K., Natural Convection in a PV-Integrated Double-Skin Façade using Large-Eddy Simulation, Procedia Engineering, 14, 2011. Crossref

  2. Sanvicente E., Giroux-Julien S., Ménézo C., Bouia H., Transitional natural convection flow and heat transfer in an open channel, International Journal of Thermal Sciences, 63, 2013. Crossref

  3. Daverat C., Pabiou H., Ménézo C., Bouia H., Xin S., Experimental investigation of turbulent natural convection in a vertical water channel with symmetric heating: Flow and heat transfer, Experimental Thermal and Fluid Science, 44, 2013. Crossref

  4. Lau G.E., Sanvicente E., Yeoh G.H., Timchenko V., Fossa M., Ménézo C., Giroux-Julien S., Modelling of natural convection in vertical and tilted photovoltaic applications, Energy and Buildings, 55, 2012. Crossref

  5. Lau G. E., Yeoh G. H., Timchenko V., Reizes J. A., Large-Eddy Simulation of Turbulent Natural Convection in Vertical Parallel-Plate Channels, Numerical Heat Transfer, Part B: Fundamentals, 59, 4, 2011. Crossref

  6. Timchenko Victoria, Eddie Leonardi Memorial Lecture: “Natural Convection From Earth to Space”, Journal of Heat Transfer, 134, 3, 2012. Crossref

  7. Gaillard Leon, Giroux S., Pabiou H., Ménézo C., Full-Scale Experimentation on Building an Integrated Photovoltaic Component for Naturally Ventilated Double-Skin Configuration, Journal of Fundamentals of Renewable Energy and Applications, 2, 2012. Crossref

  8. Gaillard Leon, Giroux-Julien Stéphanie, Ménézo Christophe, Pabiou Hervé, Experimental evaluation of a naturally ventilated PV double-skin building envelope in real operating conditions, Solar Energy, 103, 2014. Crossref

  9. Timchenko V., Tkachenko O. A., Giroux-Julien S., Ménézo C., Dančová Petra, Vít Tomáš, Numerical and Experimental Investigation of Natural Convection in Open-Ended Channels with Application to Building Integrated Photovoltaic (BIPV) Systems, EPJ Web of Conferences, 92, 2015. Crossref

  10. Tkachenko O.A., Timchenko V., Giroux-Julien S., Ménézo C., Yeoh G.H., Reizes J.A., Sanvicente E., Fossa M., Numerical and experimental investigation of unsteady natural convection in a non-uniformly heated vertical open-ended channel, International Journal of Thermal Sciences, 99, 2016. Crossref

  11. Timchenko Victoria, Reizes John A., Validation Problems in Computational Modelling of Natural Convection, in 50 Years of CFD in Engineering Sciences, 2020. Crossref

  12. Cortés Jesús, Herrero Henar, Pla Francisco, A Galerkin/POD Reduced-Order Model from Eigenfunctions of Non-Converged Time Evolution Solutions in a Convection Problem, Mathematics, 10, 6, 2022. Crossref

  13. Sharma Manoj Kumar, Alternative designs and technological advancements of phase change material integrated photovoltaics: A state-of-the-art review, Journal of Energy Storage, 48, 2022. Crossref

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