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Influence of the external envelope u-value decrease on thermal and energy performace of buildings in Brazil


It is widespread amongst professionals and researchers that buildings with higher external envelope thermal resistance are more comfortable and consume less energy. In a previous research, for Portugal and Southern European countries, it was verified that a highly insulated envelope can cause overheating in summer. The aim of this work is to do a similar study applied to Brazilian buildings and climates. The methodology consists in parametric studies obtained through computational simulations. It is intended to consider a considerable range of climates, buildings geometries, patterns of use, etc, in order to identify behavior patterns and tendencies regarding the decrease of the external building envelope U-value. As a final result, it is intended to contribute to a better understanding of the subject through providing indicators that can help to predict when there is overheating as a consequence of an external envelope U-vale decrease. (AU)

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