Abstract
Solar radiation is the main energy source and responsible for heat gain in buildings, particularly in tropical climate regions. In general, roofing is one of the constructive components that receive most of incident solar radiation in single-storey buildings. One of the techniques to attenuate the solar heat gain is the use of radiant barrier in the roofing system. This paper presents results about thermal performance of different kinds of radiant barrier applied to tiles to verify the temperature attenuation. The study was performed in test cells, where the radiant barrier (aluminum film) was applied to a roofing system consisting of metallic tiles and PVC membrane. Results show that radiant barriers are efficient in providing a good thermal performance of roofing systems and are expected to contribute for the knowledge transfer to designers so as to provide thermal comfort and energy saving in buildings.
Highlights
The thermal behaviour of buildings depends on several factors such as implantation, orientation, materials and constructive components
The purpose of this paper is to report measured data of radiant cooling roofing with materials largely used in Brazilian civil construction
The best results for thermal behaviour of white metallic tiles are those in the attic of test-cells, because concrete slab has worked as attenuator of curves differences
Summary
The thermal behaviour of buildings depends on several factors such as implantation, orientation, materials and constructive components. The designer should consider the climatic conditions of the place, having in mind that the built environment acts as a control mechanism of the climatic variables, through the building envelope (walls, floor, roofing and openings) and the nearby climatic elements (presence of water masses, vegetation, buildings in neighborhood, soil type and others). In this context, the roof is the constructed component with the strongest thermal load due to incident direct solar radiation for a long period during the day. Results of many researches show that it is possible to achieve development and at the same time to save more natural sources than it had been done for many years
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