Three Dimensional Analysis of Displacement Ventilation Systems

Abstract

In this study a three dimensional computational study is conducted in order to investigate the effect of various parameters on the flow in displacement ventilation systems. In addition to demonstrating the importance of three-dimensional effects, it shows the effect of many important geometric and operational parameters on the displacement ventilation in a room. Effects studied include the height of the ceiling, cooling and heating from ceiling, the location and strength of the source heat flux, and the location of the pollutant source. The predictions are made with the aid of a mathematical model comprising governing partial differential equations expressing balance of momentum in three Cartesian-coordinate directions, conservation of mass and energy, and transport equations for the kinetic energy of turbulence and its rate of dissipation. The latter two equations being required by the adopted turbulence model