INFLUÊNCIA DO ENVELHECIMENTO, LIMPEZA E PINTURA DA SUPERFÍCIE DE TELHAS DE FIBROCIMENTO SOBRE O DESEMPENHO TÉRMICO DA COBERTURA

Abstract

This work aims to analyze the influence of aging, cleaning and painting of the surface of fiber cement roof tiles, over its thermal emittance and solar reflectance, on the thermal performance of the roof. The evaluation was carried out by means of measurements of these properties in gray and white samples with long exposure to the weather in the city of Florianópolis. The measured data were inserted in a computational simulation in the EnergyPlus software, observing the variation of thermal performance of a detached house. It was observed that the aging of the samples caused a reduction in solar reflectance and an increase in emittance, leading to the addition of 9.4% and 7.8% of the sum of annual cooling load for gray and white samples, respectively. Cleaning the tiles allowed the recovery of the original properties, with a reduction of 10.5% (gray) and 13.4% (white), when compared to the aged material. Painting the tiles was only relevant when it is intended to change the color of the roof in order to improve thermal performance.