Análise de desempenho térmico segundo a ABNT NBR 15575/2013: comparação entre steel frame e alvenaria convencional em Palmas-TO

Abstract

The city of Palmas, capital of the state of Tocantins, is considered one of the warmest Brazilians state capitals currently. It has a relatively dry season throughout the year, exceeding 40.0 oC of maximum daily temperature in the dry months. Due to the climatic characteristics of the region, buildings have great difficulty in performing and guaranteeing thermal comfort. This study presents an analysis of the thermal performance in a Steel Frame and a Conventional Masonry residence in Palmas-TO, verifying which construction system provides better performance, according to the minimum requirements established in ABNT NBR 15575:2013. The analysis was performed through the simplified procedure, calculating the thermal transmittance and the thermal capacity of the sealing systems, and through the on-site measurement procedure, measuring the air temperature in the buildings during three consecutive days. It was found that, despite the Steel Frame having materials with high thermal insulation, the construction system did not meet the thermal capacity requirement, keeping the air temperature inside the building about 8 oC above the temperature of the outside air. The analysis of the Conventional Masonry residence, on the other hand, met all the minimum requirements required by the performance standard, making it the masonry construction system to have the best thermal performance.