Energy index evaluation of buildings in function of the external temperature

In Brazil, the energy crisis and the scarcity of financial resources to build new plants have increased the interest in saving energy. Buildings are responsible for using a vast amount of energy. To implement actions to save energy in old buildings, it is necessary to measure its energy efficiency. It is difficult to analyze the consumption of energy because of a great amount of variables. Even if there are some fixed variables, the external environment affects strongly the energy use. This paper presents a study, which searches an index of specific consumption with the external temperature. The  present work took as base a acclimatized artificial building analyzed through simulation in the Energyplus and compared with measured values. The results collated by means of mathematical modeling had been adjusted for the considered index.