Análise da transferência de calor multidimensional em solo e fundação sob edificação

Abstract

The heat transfer occurs due to temperature differential. This phenomenon has direction and intensity, being influenced according to the thermal properties of the material or the temperature differential that it is subjected. The heat flux calculation can variate due to the considerations that are taken, for instance the multidimensional effect and the conditions imposed. In the case of buildings, the heat flux may suffer deviations in its direction due to changes in the thermal resistance of the materials and irregular geometries. These variations generate the called thermal bridges. This work has as objective to analyse the multidimensional effects in the simulations of heat flux in the lower structure of a building. In this region, the interaction between internal and external environments is studied through the floor, foundation and soil. For this analysis, simulations in steady flow had were performed through the software ANSYS Mechanical APDL Solver varying in one-dimensional, two-dimensional and three-dimensional effects. In addition, two weather conditions were imposed in the simulations: summer, with higher temperatures, and winter, with lower temperatures. The results of these simulations are illustrated by temperature and heat flux profiles in the studied conditions. Thus, it is possible to compare the multidimensional effects in the heat transfer of the lower structure of a building and evaluate the influence of thermal bridges.