Dissertação
Análise comparativa de simulação de ventilação em contexto urbano com coeficientes de pressão tabelados e oriundos de CFD
Fecha
2022-03-04Autor
Ribeiro, Mateus Fonseca
Resumen
The limited availability of natural resources raised a global awareness to the necessity
of optimizing the consumption of these resources in the civil construction. Thermal
comfort is an important factor in the pursuit of making sustainable buildings since active
conditioning systems are quite responsible for the high energy consumption in
buildings. A properly designed natural ventilation is capable to provide thermal comfort
during most of the time in the many climatic regions of Brazil. The use of thermal
simulations assists the design process of natural ventilation, in which the context where
the building is inserted must be considered. The aim of this research is to evaluate the
influence of the pressure coefficients in the natural ventilation of an isolated residential
building located in a specific context created in the city of Porto Alegre. The pressure
coefficients are relevant components of the equations that evaluate the natural
ventilation in the computer simulation. The method applied in this research relied on a
Computational Fluid Dynamics simulation to obtain pressure coefficients specific to the
context created and compared to the widely used AIVC pressure coefficients. In order
to analyze the impact of the different pressure coefficients, the housing unit was
modeled in an energy simulation software. Hence, it was simulated with the CFD
pressure coefficients and the AIVC database pressure coefficients. The results found
indicated overpredicted levels of air exchange for the AIVC pressure coefficients,
considering the context evaluated. Differences in hourly operative temperature
reached 1.05º C between the two models.