Evaluación de la sostenibilidad en la rehabilitación energética de vivienda social en países mediterráneos = Evaluation of sustainability in the energy rehabilitation of social housing in Mediterranean countries

In Spain, where there are more than 18 million households according to the last census of the National Institute of Statistics in 2011, around 8% of the population lives in social rental housing. Of the Spanish housing stock, more than half of the buildings were built before 1980 and around 35% between 1981 and 2006, the year in which the Technical Building Code was implemented. Likewise, more than 80% of the energy certificates of existing buildings registered until July 2015, obtain an E rating or lower in terms of CO₂ emissions. To improve these results, the European Union aims to achieve a private buildings rehabilitation rate of 2.5% per year, improving energy efficiency and extending the useful life of the building park. However, CEEEs only represent part of the use stage, leaving behind others, such as production, whose impact can represent a quarter of the building's CO₂ emissions throughout ist life cycle. To develop an optimal rehabilitation, it is proposed to evaluate the sustainability of the rehabilitation projects including the stages of production, construction, use and end of life and considering the environmental and economic impact, as well as social aspects related to the characteristics of social housing. This article analyzes the environmental impacts of different rehabilitation solutions in social housing, taking as a case study a social housing building in Zaragoza. The building before the rehabilitation supposes almost 50 kgCO₂-eq / m² year, where 60% correspond to the electrical consumption during the phase of use of the building. The study also includes the thermal comfort variable in situations of energy vulnerability.