Avaliação dos limites das propriedades térmicas dos fechamentos opacos da NBR 15220-3, para Habitações de Interesse Social, da Zona Bioclimática 2

Abstract

The present study aimed to analyze the values recommended by the NBR 15220 - part 3 and considered as limits of thermal transmittance, thermal lag factor and solar heat for both vertical and horizontal components to the bioclimatic zone 2 brazilian. So, at the first moment the construction characteristics of the housing to be simulated in this work were definid, so that they would meet the minimum specifications proposed by the Minha Casa Minha Vida Federal Government Program. The opaque closures walls and roof, of the base case, were defined from the limits set by the thermal properties of NBR 15220-3, for bioclimatic zone 2. The results obtained with the simulation of base case established thermal comfort and energy efficiency, with which various configurations of the envelope were simulated and subsequently compared, making possible to verify the relevance of the recommendations set forth in the standard. The results indicated that the limits established by NBR 15220-3 are not justified for thermal lag factor and solar heat variables, when evaluated by thermal comfort indices obtained by simulation. It was possible to verify that both the thermal lag as the solar absorptance increasing are beneficial for the indoor thermal comfort over the years climatic zone 2, where the situations of discomfort in winter are predominant.