Reference : Principles for nearly Zero-energy Buildings: Paving the way for effective implementat...
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Principles for nearly Zero-energy Buildings: Paving the way for effective implementation of policy requirements
Atanasiu, Bogdan []
Attia, Shady mailto [Université de Liège > Département ArGEnCo > Techniques de construction des bâtiments >]
Principles for nearly Zero-energy Buildings: Paving the way for effective implementation of policy requirements
Atanasiu, Bogdan
[en] The European Union (EU) aims at drastic reductions in domestic greenhouse gas (GHG)emissions of 80% by 2050 compared to 1990 levels. The building stock is responsible for a major share of GHG emissions and should achieve even higher reductions of at least 88% - 91%. Therefore, without consequently exploiting the huge savings potential attributed to the building stock, the EU will miss its reduction targets. More than one quarter of the 2050s building stock is still to be built. The energy consumption and related GHG emissions of those new buildings need to be close to zero in order to reach the EU’s highly ambitious targets.
The recast of the Energy Performance of Buildings Directive (EPBD) introduced, in Article 9, “nearly Zero Energy Buildings” (nZEB) as a future requirement to be implemented from 2019 onwards for public buildings and from 2021 onwards for all new buildings. The EPBD defines a nearly Zero-Energy Building as follows: [A nearly Zero-Energy Building is a] “building that has a very high energy performance… [ ]. The nearly zero or very low amount of energy required should to a very significant extent be covered by energy from renewable sources, including renewable energy produced on-site or nearby.” Acknowledging the variety in building culture and climate throughout the EU, the EPBD does not prescribe a uniform approach for implementing nearly Zero-Energy Buildings and neither does it describe a calculation methodology for the energy balance. To add flexibility, it requires Member States to draw up specifically designed national plans for increasing the number of nearly Zero-Energy Buildings reflecting national, regional or local conditions. The national plans will have to translate the concept of nearly Zero -Energy Buildings into practical and applicable measures and definitions to steadily increase the number of nearly Zero-Energy Buildings. Obviously the qualitative nature of criteria in the above-mentioned nZEB definition leaves room for interpretation. While illustrating the major pillars of future nZEB – drastically reduced energy demand and a major share of renewable energy supply - the terms “nearly zero or very low amount of energy”, “very significant extent” (to which the energy required should be covered by renewable energy sources), and “renewable energy produced on-site or nearby” require further examination and definition.
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