On-line version ISSN 1678-8621
NEVES, Leticia de Oliveira and RORIZ, Maurício. Procedures for estimating the potential use of solar chimneys for natural ventilation enhancement in low-rise buildings. Ambient. constr. [online]. 2012, vol.12, n.1, pp. 177-192. ISSN 1678-8621. http://dx.doi.org/10.1590/S1678-86212012000100012.
Natural ventilation is one of the most important strategies for passive cooling of indoor environments. It can occur by wind forces, by stack effect or by a combination of both strategies. The second choice tends to be more effective in urban areas, where there are obstacles that block or significantly reduce wind speed. This paper analyses prediction procedures for the potential use of solar chimneys in low-rise buildings at low latitude locations. Theoretical predictions were developed using a mathematical model and computer simulation. A calibration procedure was used, based on results obtained through an experimental set up. The procedure consisted in a comparative analysis of chosen variables, considering data of surface temperature, air temperature and volumetric flow rate inside the chimney channel. The results confirmed the great potential of applicability of the theoretical models in the performance analysis of solar chimneys, especially the simulation model, which presented differences lower than 20% between measured and estimated results.
Keywords : Solar chimney; Natural ventilation; Stack effect; Solar energy.