Modelagem por diferenças finitas do telhado verde para o clima de Crateús

Abstract

The green roof has been proposed as an alternative to mitigate the thermal discomfort caused by the increase in temperature in the urban environment, in order to reduce the energy consumption of buildings and provide a more sustainable and ecological development of the space. For this purpose, the present study aimed to compare the thermal performance of two buildings, one with a conventional solid concrete roof and the other with a green aloe roof applied to the meteorological conditions of the city of Crateús-CE. For this purpose, a mathematical model was developed in a one-dimensional transient regime of heat transfer from walls and roof, using the energy balance analysis as a tool to determine the temperature variation inside the environment every hour during 24 hours. The numerical solution of the mathematical model was carried out using the finite difference method implemented in the Matlab software, in which values of the temperature of the roof and interior of the environments were obtained, through simulation, using solar radiation, wind speed as input data. and the ambient temperature of the analyzed day. The input data were acquired from the meteorological station A342 located in the municipality of Crateús, available on the website of the National Institute of Meteorology (INMET). For comparison purposes, May 27, 2021 was chosen, during the period known as the rainy season, and October 16, 2021, during the dry period, in order to understand the thermal behavior of these roofs at different times of the year. year. The results prove the efficiency of the green roof compared to the conventional roof, since they reduce temperature fluctuations inside the building by almost 2 °C and are more thermal insulators, that is, they are less likely to exchange heat with the environment. external environment. Thus, it was possible to verify that the green roofs inserted in the meteorological conditions of the city of Crateús can be considered as a viable alternative to promote thermal comfort in buildings in the municipality.