Thermal and energy performance of roof vegetation in subtropical climate

• Autor(a) principal: Fernandes, Tatiane Ballerini
• Data de Publicação: 2018
• Outros Autores: Ruivo, Roseana Bonotto, Cunha, Eduardo Grala da, Krebs, Lisandra Fachinello
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: PARC (Campinas)
• Texto Completo: https://periodicos.sbu.unicamp.br/ojs/index.php/parc/article/view/8650882
• topic: Green roofs; energy efficiency; thermal-energetic performance; Cobertura vegetada. Eficiência energética. Desempenho termoenergético.

This article presents the thermal performance of different models of green roofs applied to an office building in the city of Pelotas–RS, Brazilian Climatic Zone 2, observing the contribution of the different vegetated solutions applied to the horizontal plane, regarding the behavior of the opaque and transparent closures. The building is artificially conditioned and has 187,50 m², configuring six thermal zones, and was simulated with the software Energy Plus 8.4.0. As alternatives to the green roofs – configured in four substrate heights –, three other roof models were tested: asbestos cement with a 10 cm concrete slab – with and without thermal insulation of extruded polystyrene – and asbestos cement painted with white color. The study sought to determine which roof is more energy efficient, based on the evaluation of the energy consumption results and the analysis of the thermal flow in the building. The building with the green roof with higher substrate layer depth (50 cm) presented the best performance, with an energy consumption of 84.3 kWh/m2.year. The building with the conventional asbestos cement roof was responsible for the higher energy consumption: 103.5 kWh/m2.year. The green roofs presented better performance due to their thermal capacity and insulation capacity and due to aspects related to evapotranspiration and consequent latent heat exchanges. This work aims to contribute to a better understanding of the thermal energy performance of green roofs.