Abstract
Air conditioning systems are seen as a crucial part of any structure because they are directly related to the comfort of the occupants. Finding a conditioning system that exhibits not only a high level of comfort, but also a decrease in energy consumption and cost of the system is now very much preferable, especially with the ever-increasing cost of energy. Mixed convection for different boundary conditions and different configuration is carried out. In addition, a flow is injected through a window and extracted through an opposite window. In this work we examine the influence of the value of the Rayleigh number on the flow structure. The numerical analysis was carried out using the ‘Fluent’ software. To deal with turbulence the RNG k-ε model was adopted in this study. The study of ventilation efficiency has shown that the intensity of the recirculation flow increases near the adiabatic wall with the increase of Rayleigh number.
Highlights
In a context of control of energy demand, the building sector is taking a relatively larger share in total French energy consumption
In France, these thermal regulations apply for all buildings including the tertiary sector, with three major requirements: (1) the improvement of the energy efficiency, (2) the reduction of energy consumption and (3) summer comfort in non-air-conditioned buildings (RT2012, 2012)
Papanicolaou and jaluria [4] presented numerically the influence of the thermal conductivity, Richardson and Reynolds numbers on the average Nusselt number induced by mixed convection within enclosure
Summary
In a context of control of energy demand, the building sector is taking a relatively larger share in total French energy consumption. Papanicolaou and jaluria [4] presented numerically the influence of the thermal conductivity, Richardson and Reynolds numbers on the average Nusselt number induced by mixed convection within enclosure. Overall, they find that the heat transfer increase with increasing this controlling parameters. By adding a heat sources in the ventilated rectangular cavity, the same authors Papanicolaou and jaluria [5] showed that the location of the sources strongly influences the flows structures, and an oscillatory behavior was obtained for Gr/Re2=50. We are interested in the influence of ventilation and heating on the dynamics of the flow and the heat transfer taking into account the Ra number which varies as a function of the heating temperature
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