Publicação
Numerical analysis of cross-ventilation in generic isolated building configurations
| Resumo: | This thesis presents a numerical analysis of cross-ventilation in generic isolated building configurations. This study focuses on understanding how cross-ventilation is affected by changing the length of the building, the number of partitions and the position of the partition opening for a generic building configuration. Firstly the depth of the building was changed (2.5, 5 and 10 times the building height) and it was found that the volume flow rate through the inlet opening was constant, the air exchange rate decreased proportionally with the building depth, the CO2 concentration and the mean age of air increased with the building depth. The air exchange efficiency was higher in the deepest building and, for this particular case, cross-ventilation was efficient for a building depth ten times the building height. Secondly three different buildings with a partition wall and a door opening were tested for two different building depths. It was concluded that the geometries where the door opening was located close to the side wall (not in front of the inlet/outlet openings) outperformed the other different geometries (including the cases without partition) in terms of mean age of air, CO2 concentration, volume flow rate, air exchange rate and air exchange efficiency. |
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| Autores principais: | Dias, João Maria Bravo Vieira |
| Assunto: | CFD Ventilação cruzada Ventilação natural Teses de mestrado - 2015 |
| Ano: | 2015 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório da Universidade de Lisboa |
| Resumo: | This thesis presents a numerical analysis of cross-ventilation in generic isolated building configurations. This study focuses on understanding how cross-ventilation is affected by changing the length of the building, the number of partitions and the position of the partition opening for a generic building configuration. Firstly the depth of the building was changed (2.5, 5 and 10 times the building height) and it was found that the volume flow rate through the inlet opening was constant, the air exchange rate decreased proportionally with the building depth, the CO2 concentration and the mean age of air increased with the building depth. The air exchange efficiency was higher in the deepest building and, for this particular case, cross-ventilation was efficient for a building depth ten times the building height. Secondly three different buildings with a partition wall and a door opening were tested for two different building depths. It was concluded that the geometries where the door opening was located close to the side wall (not in front of the inlet/outlet openings) outperformed the other different geometries (including the cases without partition) in terms of mean age of air, CO2 concentration, volume flow rate, air exchange rate and air exchange efficiency. |
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