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Proceedings of CHT-15. 6th International Symposium on ADVANCES IN COMPUTATIONAL HEAT TRANSFER
May, 25-29, 2015, Rutgers University, New Brunswick, NJ, USA

DOI: 10.1615/ICHMT.2015.IntSympAdvComputHeatTransf


ISBN Print: 978-1-56700-429-8

ISSN: 2578-5486

THREE-DIMENSIONAL STUDY OF NATURAL CONVECTION IN COMBINED DOUBLE-SKIN FACADE/ROOF CONFIGURATION

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

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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