Energy Performance Indicators for Energy Management Systems in Net Zero Energy Buildings

The present paper aims to evaluate the energy use, the variables that affect the electric energy consumption of a public building to develop energy performance indicators based on ISO 50001 and ISO 50006, in addition to simulating and evaluating proposals for Energy Efficiency Actions having as study case in point, the restaurant of the Federal University of the Semi-Arid Region (UFERSA), at Caraúbas, located in the northeast region of Brazil, with a semi-arid climate characterized by high temperatures and thermal sensation. The application of the methodology resulted in more than 50% of final energy use being concentrated in air conditioning and refrigeration, for environments or food. Relevant variables were established and verified graphically and statistically, as well as determining static factors that influence consumption, among them air temperature (°C) has the greatest effect on the building. Two Energy Performance Indicators (EnPI) were determined, the active energy consumed per square meter per year, 60.70 kWh/m
²
/year, and the active energy per user per year, 0.83 kWh/m
²
/year, when compared using reference values, it was determined that the building can be classified as energy efficient in terms of the first indicator. Energy efficiency actions was simulated, use of more efficient air conditioning units, application of thermal insulation on the roof and replacement of single-glazed windows with insulated glass were evaluated and compared, technically and economically, against the investment in a grid-connected photovoltaic system, for the same building and based on the Brazilian INI-C methodology, it was assessed whether this building would be classified as Nearly Zero Energy Buildings (NZEB) and Positive Energy Buildings (PEB).