Modelagem matemática de um sistema de teto-reservatório mais aspersão em telhado: potencial de aplicação em clima tropical

Abstract

Passive cooling strategies have shown promise for tropical climate locations. In addition, the search for the rational use of energy has directed international research towards bioclimatic strategies that make it possible to improve thermal comfort with low consumption of this resource. This work presented a proposal for the application of roofs ponds in full scale, with the use of a retractable roof and sprinkler over covering to protect the water depth. The mathematical modeling of the system was programmed in EES code and the thermal load of a hypothetical construction was calculated using MATLAB code from hourly weather data. The theoretical cooling potential of the roof pond was analyzed in two distinct configurations: i) open attic, with air circulation and ii) closed attic, without air circulation, both tested for humid tropical climates (João Pessoa-PB) and semiarid (Quixeramobim-CE). The results obtained were consistent with experimental data from the literature. For the best configuration (open attic), an average cooling potential of 12.7 W/m² was obtained for João Pessoa, 21.52 W/m² for Quixeramobim. The thermal load has been reduced by up to 34%. In addition, the aspersion on the roof allowed an approximate 8 °C reduction in the temperature of the tile. It was also shown that the depth of the water did not have a great influence in an open attic. It is possible to improve system performance for higher indoor air velocities and full-scale metal ceiling application.