Evaluation of influences of the external temperature in the building energy consumption

Forward of the shortage of energy resources, the rational use of the energy started to be a subject of great relevance. In the last years, the countries come taking conscience of this and searching alternatives to optimise the energy use. For constructed buildings, the alternative is to use installations efficiently. In this purpose, a posoccupation evaluation becomes necessary to know the building performance and then helps an energy management. In countries of hot climate, the external temperature affects the thermal building performance and its energy consumption. Thermal inertia is a building factor that gives attenuation in the thermal load transferred into the building due the outdoor climatic. The time delay and the damping of the heat transference caused for thermal inertia cause delay in time response of the HVAC system and in the energy impact. This work searches the relationship between the building energy consumption and the external temperature. Analysing simulated and actual data it can be seen how the external temperature affects the energy consumption. Using that information it is possible to obtain an normalised energy performance index.