Analysis of the envelope in a higher education building

application of the methodology INI-C

Abstract

The publication of the Inmetros’ Normative Instruction n° 42/2021 updated the evaluation methods and introduced, in the Brazilian scenario, new ways of calculating the thermal load of the envelope. Therefore, it became relevant to test the new programs made availed by the Programa Brasileiro de Etiquetagem (PBE), to better understand the variables and the applicability of the simplified method. The current paper aims to calculate the annual conduction thermal load of the envelope of a higher educational building, located at the city of Belo Horizonte, Minas Gerais, by applying the simplified method of described by INI-C raising positive points and limitations of the new method. The article’s methodology involved the verification of the building’s technical information, through its architectural plans, sections, and descriptive memorial, besides the insertion of the collected data on the metamodel’s web interface in order to obtain the annual thermal load. After collecting all the envelope parameters, the web interface calculated the total annual thermal load. kW/year. Subsequently, it was made a comparison between the calculated thermal load with and without the contribution of natural ventilation. The level of energy efficiency of the building, including the percentage of hours in discomfort and the coefficient of reduction of the total annual thermal load for classification D to A. Natural ventilation allowed a global reduction of 89% of this thermal load and the classification of the individual system of the envelope reached the level A. As for the method barriers were identified in the division of thermal zones and in the final accounting of comfort hours, not possible to be made by the web interface.