A numerical investigation of air flow and temperature distribution in a ventilated room

University of Technology, Sydney. Faculty of Engineering and Information Technology.A numerical investigation of ventilation enhancement by a roof-mounted fan has been performed. The commercial code CFD-ACE is used for the quantitative and qualitative analysis of velocity and temperature distributions in a ventilated room . The parametric study is based on the results of flow and thermal fields obtained from the numerical simulations of three-dimensional models to optimise the location and through flows of a roof-mounted fan to minimise the cooling time of a space once the fan is switched on. The four ventilator locations have been modelled and the environmental indoor conditions analysed for different speeds of extracted and injected air and temperature of walls. For all cases, Reynolds Average Navier-Stokes, continuity, energy and k-ε equations were defined for steady state and transient, incompressible, turbulent air flows. The second order upwind differential scheme was used and Boussinesq approximation was applied. The equations were solved by using a commercial code based on the finite volume method in a staggered grid system