Numerical prediction of thermo-aeraulic behavior for a cavity with internal linear heat source

Authors

1 Faculty of Building Services and Equipment, Technical University of Civil Engineering, Bucharest 020396, Romania

2 Universite de Lyon, 69361 Lyon Cedex 07, France

Abstract

Computational Fluid Dynamics (CFD) is a promising way, nowadays, to predict the air Flow in enclosures. As a result, the objective of this study is to assess the potential of CFD technique to predict the air Flows driven by buoyancy in heated real-scale rooms. The numerical model is validated using experimental data for fullscale test rooms; therefore, the experimental set-up is rst presented. This is followed by the numerical model description, focusing on its principal elements: computational domain geometry, discretization, turbulence model, radiation model, and thermal boundary conditions. In addition, a simpli ed approach is proposed to integrate a heat source in CFD models: Term source homogeneously spread all over the volume of the heat source. Comprehensive experimental-numerical comparisons are presented in terms of heat transfer to the walls of the test room, heat source behavior, and plume development. The results show that the model developed in this study leads to realistic predictions. Finally, the simpli ed CFD description of heat sources developed here can be extrapolated for other con gurations - di erent power, heat emission (convection/radiation), dimensions, and shape. Consequently, this method can be applied in detailed studies dealing with thermal comfort, indoor air quality, and energy consumption for heated rooms.

Keywords

Scientia Iranica
Volume 23, Issue 2 - Serial Number 2
Transactions on Mechanical Engineering (B)
April 2016
Pages 618-632

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