CFD modeling of buoyancy driven cavities with internal heat source—Application to heated rooms

•Comprehensive CFD model for buoyancy driven cavities with internal heat source.•Heat source original simplified description.•Experimental validation based on full scale test cell (heated enclosure).•Results: heat transfer to walls; heat source behaviour; plume characteristics.•Application for other...

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Bibliographic Details
Published in:Energy and buildings Vol. 68; pp. 403 - 411
Main Authors: Teodosiu, C., Kuznik, F., Teodosiu, R.
Format: Journal Article
Language:English
Published: Oxford Elsevier B.V 01.01.2014
Elsevier
Subjects:
Applied sciences
Building technical equipments
Buildings
Buildings. Public works
Buoyancy driven cavity
CFD – Computational Fluid Dynamics modeling
Computation methods. Tables. Charts
Energy management and energy conservation in building
Engineering Sciences
Environmental engineering
Exact sciences and technology
Experimental room
Heat source
Mechanics
Physics
Space heating
Structural analysis. Stresses
Thermal plume
Thermics
CFD – Computational Fluid Dynamics modeling
Heat source
Buoyancy driven cavity
Experimental room
Thermal plume
CFD
Computational Fluid Dynamics modeling
Turbulence
Computational fluid dynamics
Buoyancy
Experimental device
Plume
Experimental study
Modeling
Geometry
Heating
Numerical simulation
Thermal analysis
Room
Heat transfer
ISSN:0378-7788
Online Access:Get full text
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Description
Summary:•Comprehensive CFD model for buoyancy driven cavities with internal heat source.•Heat source original simplified description.•Experimental validation based on full scale test cell (heated enclosure).•Results: heat transfer to walls; heat source behaviour; plume characteristics.•Application for other heat sources that differ in power, heat emission, shape, size. The aim of this work is to examine the capacity and the accuracy of a CFD (Computational Fluid Dynamics) model to characterize the thermo-aeraulic behavior of a heated room. Firstly, we present a brief description of the experimental set-up taken into account (two experimental tests with changed room boundary conditions were taken into account). Afterwards, the focus is on the main features of the numerical model (that strongly influence the accuracy of results): computational domain geometry and discretization, turbulence model, near wall treatment, radiation model and thermal boundary conditions. In addition, a simplified approach is presented here in order to integrate a pure buoyancy source within the model, based on a volumetric heat generation rate which is uniformly distributed within the heater. Furthermore, detailed experimental–numerical comparisons are given with regard to heat transfer to the walls as well as to heat source behavior and plume characteristics. The results obtained demonstrate that the CFD method employed in this work leads to reliable results. Consequently, this approach can be useful in detailed studies dealing with thermal comfort, indoor air quality and energy consumption for heated rooms. Finally, the simplified method presented here, concerning the integration of the heat source in the CFD model, can be effortlessly extended for other localized heat sources that differ in power, heat emission mode (convection or radiation), shape or size.
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ISSN:0378-7788
DOI:10.1016/j.enbuild.2013.09.041