Abordagem analítica para análise térmica dos trocadores de calor solo-ar na cidade de Pelotas/RS

Abstract

Abstract: Earth-air heat exchangers (EAHE) represent a promising option for reducing the heating/cooling load of buildings. Unlike traditional air conditioning systems, EAHE employs a renewable energy source and can operate with little electricity. Basically, they use underground ducts, where air circulates in order to exchange heat with the soil. Because the first layers of soil are warmer than the outside air in winter and cooler in summer, the earth's crust can be used as a heat source or sink. Recent research has shown that these devices can function properly in southern Brazil, where a subtropical climate prevails. Thus, in this work, the thermal performance of the EAHE applied in the municipality of Pelotas, located in the Brazilian state of Rio Grande do Sul, is analyzed. In the methodology employed, data "in situ" of the geotechnical profile of the soil obtained at many locations in the city, through percussion sounding tests (SPT). To perform the computer simulations, an analytical model was tested and validated, in addition to the creation of a numerical code to determine the soil temperature. The results point to good prospects for the installation of these devices in the city of Pelotas, with instantaneous thermal potentials around 6 ºC in the months of picode temperatures.