The study of Turbulent Natural buoyant flows of Newtonian fluids has received considerable attention in the recent past. The study concerns with motion and conditions that cause the motion. This book presents a numerical study of the structure of the flow and heat transfer rates due to temperature differences on opposite walls in an enclosure. The temperature distribution, velocity profiles and turbulent intensities in the whole enclosure are important in order to ascertain how flow conditions deviate from the desired micro-climatological condition for human comfort, stored food and sensitive electronic equipment. It is shown that the location of the heater and window has an important influence on the overall heat transfer in the room.