Transformación de las viviendas  de la burbuja inmobiliaria en  edificios de consumo energético  casi nulo: estudio de casos

Authors

Spanish residential buildings built during the real estate bubble

(200-2009) complied with the Spanish Basic Building Standard

on building thermal conditions NBE-CT-79. In 2006, the Basic

Energy Saving Document of the Spanish Technical Building

Code (CTE-DB-HE) came into effect. This code developed the

Spanish Organic Law on Buildings 38/1999 and it was also

much more restrictive. Recently, this regulatory framework has

been updated by the Spanish Royal Decree 732/2019 on energy

efficiency. This Royal Decree transposes European Directives

2010/31/EU, 2012/27/EU and 2018/844/EU on nearly-zero

energy consumption buildings (NZEB). In this paper, the energy,

emissions and economic impact caused by this legislation

change on a standard semi-detached house in the 153 cities

of Andalusia is analyzed. In each location, the household’s

original thermal behavior with the compliant with current

legislation is compared. The calculations are performed with

HULC energy simulation tool and the European PVGIS climate

data, considering the most adverse orientations. The house

adaptation involves a partial modification of the envelope, the

inclusion of solar-thermal energy for the domestic hot water

supply (DHW) and photovoltaic energy to reduce electricity

consumption. Results show that European objectives are

largely exceeded. Energy savings vary between 81% and 146%,

emissions improve between 71% and 128% and the electricity

and natural gas bill is reduced between 67% and 123%.