Análise do comportamento térmico de uma cobertura verde leve (CVL) e diferentes sistemas de cobertura / Analysis of the thermal behavior of an extensive green roof and different roof systems

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The present research main objective was to experimentally analyze the thermal behavior of an extensive green roof system and also to compare different roof system thermal behavior, considering their thermal profits in the period of transition between the stations spring-summer, in the city of São Carlos-SP. The roof systems analyzed were: 1) galvanized steel, 2) earth flax, 3) paving-stone, 4) ceramic tile and 5) extensive green roof. The extensive green roof can be characterized as a constructive system that holds a waterproofed paving-stone with vegetable resin, a slight and flexible three-dimensional geomat, used for draining, a reduced layer of substratum and grass in its surface. The green roofs advantages are mainly related to temperatures regulation, improvement of energy efficiency in constructions, possibility of pluvial waters retention (runoff), increase of green areas, attenuation of heat islands effects, beyond the aesthetic and social contribution for the urban environment. The methodology used was based on the definition of the experimental typical day and the parameters of the thermal inertia applied to the constructive components of the cover. The experimental measurements had been carried in test of cells located in the experimental base of the University of São Paulo (USP), by the group of ecotecnologys: new materials and procedures. They were stored in a system of automatic acquisition of facts, records regarding the temperatures of the internal and external air in the test of cells, and the superficial temperature of the internal roof systems. As a result, the extensive green roof presented a good behavior, considering the attenuation of the construction internal temperatures variations, facing the temperatures of the external air. It presented, also, the lesser superficial temperature of the internal face of the roof system, when compared with the other constructive systems. Therefore, one concludes that the extensive green roof consists of a feasible alternative for construction, due to its capacity of damping and delaying the thermal flow (thermal inertia), contributing to the establishment of pleasant internal temperatures and, moreover, for basing its rules on architecture patterns more sensitive to environmental issues.

ASSUNTO(S)

thermal inertia coberturas verdes experimental typical day thermal behavior comportamento térmico dia típico experimental green roofs inércia térmica

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