Eficiencia energética de las viviendas de la burbuja inmobiliaria. Estudio de caso

Abstract

This research seeks to quantify the economic condemnation that residential buildings’ end users have to endure, despite being built in the middle of the last decade, in full real estate bubble. They strictly comply with the Basic Building Standard CT-79 on thermal conditions of buildings, prior to the entry into force of the Technical Building Code in 2006 and its modifications related to energy efficiency in 2013, 2017 and 2018. Using the case study methodology, the energy efficiency of a detached single-family house in the coastal area of the province of Cadiz is analysed. Based on the analysis of the thermal behaviour of the house in its current state, 2 alternative cases are proposed (rehabilitation of the existing house and an adapted new one) modifying the constructive characteristics of its envelope, which can be catalogued as a nearly zero-energy building. Despite the fact that it is located in a climate that is not excessively severe in either summer or winter, in both cases energy demands are reduced by around 60-70% in heating and 15-20% in cooling, with costs whose return can be fully depreciated in its remaining life cycle.