Graça, Guilherme Carrilho daNunes, Hugo Miguel Luís2025-01-252025-01-2520252024http://hdl.handle.net/10400.5/97749Tese de mestrado, Engenharia da Energia e Ambiente, 2025, Universidade de Lisboa, Faculdade de CiênciasGlobal warming will have severe consequences in the building sector, increasing energy demand and exposing more people to potential health consequences caused by lack of appropriate indoor conditions. Consequently, the necessity to implement adequate building design practices and prepare for climate change is evident. This thesis assesses the performance of an enhanced cross-ventilation system which incorporates a chimney. This is done in a selected case study originally designed for the southern European climate. Its performance is compared to a traditional single side ventilation configuration (SSV), across different levels of urban surroundings, and the current and future climates of seven locations. The results indicate the chimney system (CV-1H) exhibits superior airflow performance compared to the single side system (SSV) with the same opening areas. When subjected to similar conditions, the CV-1H configuration can achieve up to nine times greater airflow, and this increase is even more pronounced – up to 20 times – in urban environments shielded by tall buildings. Moreover, the height of the chimney in CV-1H systems can be increased (CV-2H) to enhance airflow by an additional 20%. In the seven locations studied, an average increase in outdoor air temperature of 2°C by 2050 and 4°C by 2090 is expected. The developed chimney system effectively counteracts the rise in temperature by harnessing wind-driven ventilation potential, which is notably beneficial in hotter climates such as Dakar and Saint-Denis, where it reduces mechanical cooling needs by approximately 20%. Additionally, the chimney system results in substantial energy savings, on average three times greater than those observed with single side configurations.engVentilação NaturalAquecimento GlobalConservação de EnergiaSimulação Dinâmica ComputacionalEnergyPlusTeses de mestrado - 2025master thesis