Abstract
The natural ventilation in a building performs a fundamental role in users' welfare and health, when used as a bioclimatic and architectural strategy, it can provide brighter projects. Increasing the indoor air speed ventilation has an important performance maintaining indoor air quality, contributing to thermal interactions between human body and environment, which can significantly reduce the building's energy cost. In this study, a numerical research of natural convection in single-sided and cross ventilation is developed using the finite volume method, taking account the internal heat sources influence. The numerical model is used to determine the effects of wind and thermal forces combined by analyzing the stream functions and temperature distribution within an office. The turbulence model is the two differential equations for the low Reynolds number. The building's internal heat sources influence is analyzed herein. The results show that the single-sided ventilation presents excellent conformity with the results obtained in literature. The influence of the internal heat source is considered and it has been observed that the best source position is near to the air exit for both single-sided ventilation and cross ventilation.
Highlights
Natural ventilation can be used as an important strategy for local passive cooling and achieving a more comfortable indoor environment
The ventilation is linked to the temperature difference due to thermal buoyancy
Among the usual engineering solutions, cross ventilation is very efficient and provided by openings in opposite walls with pressure differential caused by the wind action
Summary
Natural ventilation can be used as an important strategy for local passive cooling and achieving a more comfortable indoor environment. When there is no combining of these two phenomena, the opposite could result in some inconveniences, such as greater pressure due to the wind from the upper openings when compared to those originated in the stuck effect, impeding the escape of smoke and dust generated internally (Heiselberg, Svidt and Nielsen, 2001; Li and Delsante, 2003). In this context, the study of the influence of power and the position of an internal heat source in an office, it helps to understand the direction of air currents and the degree of warming within this environment
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