SHEDS EXTRATORES E CAPTADORES DE AR

SIMULAÇÕES COMPUTACIONAIS E ENSAIOS NO TÚNEL DE VENTO

Abstract

Natural ventilation is one of the most efficient strategies for the passive thermal conditioning of buildings, occurring by the wind-induced natural ventilation, stack effect or by the combination of both. Among the ventilation strategies, sheds roof can be highlighted. Sheds are openings on the roof that act as air collectors or extractors, depending on their location in relation to the prevailing winds. Several tools are available to evaluate the performance of natural ventilation in indoor environments, such as Computational Fluid Dynamics (CFD) simulations and wind tunnel tests. CFD simulations may obtain high precision results. However, several researches recommend that these results should be validated by highly reliable experimental tools, such as the wind tunnel. Therefore, this paper aims is to compare CFD simulations results with wind tunnel tests on sheds roof building, in order to confirm the results similarity. This analysis is complemented with pressure coefficients data in the openings, aiming at a better foundation in the discussion of the results. For this, three configurations of sheds roof were first evaluated by CFD simulations. Then, reduced physical models were made and tested in the wind tunnel, comparing the direction of the airflow vectors in the air inlet and outlet openings. The results showed a good match, allowing to admit the reliability of the data obtained by the simulation. In addition, the tests performed show how qualitative tests are important for understanding of the natural ventilation phenomenon.