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DOI: 10.1615/ICHMT.2015.IntSympAdvComputHeatTransf.600
pages 700-713

Oksana A. Tkachenko
School of Mechanical & Manufacturing Engineering, UNSW, Sydney, Australia

Victoria Timchenko
School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney 2052, Australia

Guan Heng Yeoh
School of Mechanical and Manufacturing Engineering University of New South Wales, NSW 2052, Australia; Australian Nuclear Science and Technology Organisation (ANSTO), PMB 1, Menai, NSW 2234, Australia

John Reizes
School of Mechanical and Manufacturing Engineering, UNSW-Sydney, Sydney 2052, Australia

Graham de Vahl Davis
University of New South Wales, Kensington, NSW, Australia


As the performance of Building-integrated photovoltaics (BIPV) systems is highly sensitive to the design of the building skin this paper is aimed at advancing the understanding of a combined double-skin facade/roof configuration relevant to real buildings. A combined double-skin configuration which includes both vertical and inclined sections of the open ended channel was studied to achieve a sufficient understanding of the flow and heat transfer phenomena. The flow and thermal fields were modelled using a well-validated three-dimensional in-house Large Eddy Simulation (LES) code as well as ANSYS Fluent software. A modified Vreman SubGrid-Scale (SGS) model has been adopted as it has been shown to be superior to other SGS models for natural convection in the open ended channels in capturing both the instantaneous and time-averaged components of the temperature and velocity fields. The development of the flow and its possible transition from the laminar to the turbulent regime in this double-skin configuration was investigated.

It is shown that separation of the flow in the corner between vertical and inclined walls of the channel causes temperature and flow instabilities, resulting in complex flow structures propagating along the inclined channel. These unsteady flow structures lead to enhanced mixing in the inclined part of the configuration and to transition of the flow to turbulence. The mass flow rate of the entrained air was shown to be higher for the facade-roof configuration (3.75 · 10−2 kg/s) compared with the facade only configuration (2.4 · 10−2 kg/s) which is beneficial for the passive cooling of such systems.

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