Análise do desempenho termoenergético do prédio Ntic da Universidade Federal Do Pampa Campus Alegrete

Abstract

The present work aims to analyze the thermoenergetic performance of the NTIC building (Information and Communication Technology Nucleus) of the Federal University of Pampa Campus Alegrete – Rio Grande do Sul. The software used to analyze the building thermoenergetic performance is EnergyPlus, version 8.6.0. The simulation is performed by using the design days and the weather data of the city of Artigas – Uruguay. The building model is formed by 27 thermal zones, each one with all heat transfer surfaces. In the total, there are 9 conditioned thermal zones and the air conditioned system currently installed in the building is Split. A VRF (Variable Refrigerant Flow) air conditioned system is proposed and simulated in order to reduce the electrical energy consumption of the building. Thermal comfort parameters, such as the average air temperature, the operating temperature and the relative humidity in design days for two representative zones of the building, are analyzed. At the end of the work, the monthly and annual consumption of electricity with the installed and proposed air conditioned system are compared. The study shows that the refrigeration capacity currently installed in the building for most of the rooms analyzed is above 21% in average of the cooling load demand necessary for the room. The analysis of thermal comfort of the rooms with the new air-conditioning system shows that the operative temperature remains above the comfort limits, due to the influence of the mean radiant temperature of the room surfaces, where there are no internal shading devices. The relative humidity for the analyzed rooms remains within the range for comfort limits. The zone mean air temperature for the meeting room at the 1st floor remained above the air conditioning set point control, due to the influence of mean radiant temperature of room surfaces, which can be decreased by installing internal shading devices and a ceiling. By comparing the systems energy consumption, a reduction of 39.78 % in the annual electricity consumption with the VRF system was verified.