The effect of the solar wall heating on the flow structure within the cross-ventilation of isolated building

In this paper a comprehensive study is conducted on the heat transfer between building and the atmosphere within a cross ventilation situation, this situation is characterized by a transverse flow between the two parallel windows of an isolated building. The study is divided into two parts, in the first part, the effect of the walls, solar heating during the day (windward between sunrise and noon, the roof at the moon and leeward between noon and sunset) on the air temperature distribution and air velocity inside and outside an isolated building is studied when a numerical simulation is conducted in an atmospheric micro scale. For the second part, the study is focused on the effect of temperature change of the building floor, by an external heating source such as a recessed serpentine, on cooling or heating the air but in this case only inside the building by numerical simulation. The numerical results are validated using experimental measurements (velocity profiles and turbulent kinetic energy) of Y. Tominaga realized at Niigata Institute of Technology in Japan, these measurements provide a very useful database for validation of numerical models of computational fluid dynamics (CFD). Compared to those wind tunnel experimental measurements, the numerical results of the cross-ventilation show a good agreement. The detailed results analysis shows that the differential heating of all building surfaces can greatly influence the capacity of the flow to transport and exchange heat.