Analysis of solar absorptance and its thermal impact in a tropical region

Abstract

This study analyzes the thermal impact of absorptance on façades of different colors in the city of Cuiabá-MT, a tropical climate region with high solar incidence. The objective of this analysis is to contribute to design choices that promote urban thermal comfort. The methodology encompasses on-site data collection through surface temperature measurements using a digital infrared thermometer and thermal camera, as well as monitoring climatic conditions with a thermohygrometer. The study was conducted on a single façade, which was divided into three paint shades (light, medium, and dark) to analyze the three colors under the same solar incidence during the hot-humid period. The findings demonstrated the impact of varying levels of absorptance on the diurnal temperature fluctuations of façades, offering insights that inform façade design principles in tropical regions. The objective of the research is to promote the development of more efficient and comfortable buildings, with a reduced reliance on artificial air conditioning systems. This approach is intended to contribute to urban sustainability and the quality of life in hot cities.