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This chapter presents a numerical investigation of thermal comfort in a square cavity with displacement ventilation. Two configurations have been compared: in the first case, the air diffuser is located in the heated wall, while in the second case, it is placed in the opposite adiabatic wall. The conservation equations for mass, momentum, and energy are solved using the lattice Boltzmann method with multi-relaxation time (LBM-MRT) method. In addition, the values of the control parameters within the laminar regime, namely: Reynolds and Rayleigh numbers in the range [20–500] and [10–106], respectively, and the Prandtl number is fixed at 0.7. In the forced convection regime, results obtained as a function of control parameters (Re, Ra) relating to flow structure, isotherms, and average Nusselt number showed situations that guarantee thermal comfort against energy savings. Another important result is the average chamber temperature for H = 0.6, corresponding to the standing positions. All these results were compared with the two configurations, and correlations were established as well as mapping according to the Re-Ra pair.

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LBM Simulation of Thermal Comfort in a Room Cooled by Displacement Ventilation: Effect of Inlet-Outlet Layouts

  • 章节

  • 发表日期：

    2025年

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  • Zouhira Hireche,
  • Lyes Nasseri,
  • Djamel Eddine Ameziani,
  • Smail Ghodbane

摘要

This chapter presents a numerical investigation of thermal comfort in a square cavity with displacement ventilation. Two configurations have been compared: in the first case, the air diffuser is located in the heated wall, while in the second case, it is placed in the opposite adiabatic wall. The conservation equations for mass, momentum, and energy are solved using the lattice Boltzmann method with multi-relaxation time (LBM-MRT) method. In addition, the values of the control parameters within the laminar regime, namely: Reynolds and Rayleigh numbers in the range [20–500] and [10–106], respectively, and the Prandtl number is fixed at 0.7. In the forced convection regime, results obtained as a function of control parameters (Re, Ra) relating to flow structure, isotherms, and average Nusselt number showed situations that guarantee thermal comfort against energy savings. Another important result is the average chamber temperature for H = 0.6, corresponding to the standing positions. All these results were compared with the two configurations, and correlations were established as well as mapping according to the Re-Ra pair.