Abstract
This paper describes a numerical method for predicting the concentration of air pollutants in room, and the effects of the factors, the ventilation system, the location of air pollutant generation and so on, on the mechanism for the diffusion. The Two-Equation model of turbulence is applied to the governing equations of room air, and the discretization of the basic equations is formulated by the finite element method. This method is easy to simulate the distribution of air pollutant concentration in the actual room. As the results of computer simulation, the distribution of concentration is varied as the location of inlet and outlet in the air conditioned room. The diffusion of air pollutants have two types of mechanism. The one is the type that the turbulent diffusion exerts an influence on the concentration where the air flow speed is small, and the other is that the convection dominated diffusion where the air flow speed is relatively large. Also the air pollutant concentration is approximately predicted by the air flow speed in the place where the pollutants are generated.
