The ventilation and indoor air quality were simulated for a mall in Ioannina (Greece), a region with harsh winters. The heat transfer inside the mall was simulated, to examine whether the HVAC system is capable to heat the installation in winter and cool it in summer. So, the simulations covered the cases of summertime without air conditioning and wintertime with and without heating. All the areas of the building were modelled in detail, including the entrances, exits and windows.

The simulation modeled the heat transfer in the building. The heat from the sun was estimated by the solar load model of Fluent, accounting for the geographic location, orientation of the building and the season of the year. Moreover, the thermal properties of the building materials and the heat produced by the presence of people were inserted to the model. The renewal rate of air (Mean Age of Air) was calculated for the whole building, to highlight the dead zones with stagnant air of lower quality. The obtained temperature field and the heat fluxes were assessed, to ensure the comfort of customers and employees in the mall.