Abonnement à la biblothèque: Guest
Page d'accueil ICHMT DL Année en cours Archives Comité de direction Centre international pour le transfert de chaleur et de masse

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

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

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.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH