Modelagem e simulação termoenergética de um sistema híbrido de trocador de calor solo-ar e dispositivos eletrocrômicos

Abstract

In the last decades there is a great search for technologies that can help in the thermal comfort of buildings in order to obtain recommendations for the design of different devices used in the use of renewable energy sources and energy reuse. In this study, the thermoenergetic performance of a building, called Casa Ventura, using two renewable energy technologies, will be evaluated through computer simulation, contributing to the economic development of society by using such technologies. Four simulations were carried out for the building under study, the simulation using natural ventilation, the earth-air heat exchanger (EAHE), the electrochromic device (ED) and, finally, the simulation that includes the hybrid system, which the EAHE and the ED running simultaneously. For the simulations, the EnergyPlus software was used, with the objective of computationally analyzing the thermoenergetic performance of the hybrid system. A meteorological file from the year 2007 was developed to simulate Casa Ventura which is located in Viamão in the state of Rio Grande do Sul. The thermal performance of the building was analyzed using adaptive comfort, calculating the number of hours in comfort, based on the operating temperature of each thermal zone simulated by EnergyPlus. Comparing the results of this research with existing numerical data, it is still possible to infer that in the computational model the variation between the external air temperature has an agreement rate of 0,97, indicating that the simulated natural ventilation data present good accuracy with the data experimental; the same occurs with the result of the simulation using the EAHE, presenting a confidence index of 0,90. Regarding the thermal comfort of the four simulations, a good DE result was found during the summer months of 2007, where the studied environment of the building presented greater comfort of 95,0%, while the hybrid system had 6,8% less comfort. With the data obtained, it is concluded that the hybrid system did not present the expected performance in this work, thus, it is intended to continue the research, analyzing other types of configurations for these technologies, in the search for significant savings in electrical energy. and better thermal comfort at Casa Ventura.