Tecnologias Sustentáveis: a importância dos telhados verdes na amenização microclimática

Abstract

Among the different environmental problems that affect urban centres, we face the increase on temperature and the decrease on relative humidity on cities. The formation of heat islands and the thermal discomfort are changes observed in the urban thermal area of the cities climatic system, with serious problems to the general population. In this context, this work has as its main aim to verify the thermal performance of the green roof in analogy to other three toppings commonly used in civil construction (ceramic tile, cement tile and exposed slab). It was verified the thermal behaviour of the photovoltaic panels with the green roofs – hybrid roof. The research also had as a challenge to construct all the prototypes for microclimate monitoring. The microclimate monitoring happened in two different periods: dry and rainy season. To record the air temperature data, thermal hidrometers were used for inside measurements, and thermocouples to external measurement in photovoltaic panels. During the rainy season, the difference of up to 2° C was registered comparing the green roof to the cement tile prototype, and to the others the difference was 1°C. In the dry season the heat difference was 3° C related to the cement tile prototype, and 2° C when compared to the other toppings. In relation to external measurements done with the Thermocouples, the results are positive both on the superior or on the inferior surface of the Panel. That is, it was observed that the green roof contributes to soothe microclimate on the external environment, and consequently to the efficiency of the Panel. With these results, it is concluded that the green roof is a sustainable technology that helps soothing microclimate, on the internal and on the external environment.