DESEMPENHO TÉRMICO DE COBERTURAS VERDES COM DIFERENTES CONFIGURAÇÕES EM FLORIANÓPOLIS – SC

Abstract

Green roofs are systems that can improve the thermal performance of buildings, reducing the energy consumption of air-conditioning systems. In tropical regions, which are exposed to high solar radiation and where cooling energy demand is significant, reducing heat gains through the roof is particularly important. Thus, this work aimed to compare the thermal performance of green roofs with different substrate thicknesses, leaf area indexes and irrigation conditions, under the climatic conditions of Florianópolis – SC. Computational simulations of green roofs were carried out over a year, using the EnergyPlus 9.3 computer programme. The results showed that the increase in the substrate thickness protected the internal surface of the slab from great temperature variations, while the increase in the leaf area index, despite having contributed to the reduction of surface temperatures during the warmer months, also reduced the temperatures during the coldest months. Irrigation of green roofs only in the warmest period reduced surface temperatures in the warmer months, and also increased temperatures in the coldest months. The ideal thermal loads decreased 46.2% when the substrate thickness increased, 74.7% when the leaf area index increased and 65.0% when there is roof irrigation only in the warmest period. It was concluded that choosing the project characteristics and analysing the green roof irrigation considerably influence the thermal performance of buildings.