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pubblicazioni - Presentazione

Identification of energy efficiencies measures

pubblicazioni - Presentazione

Identification of energy efficiencies measures

La Direttiva 2010/31/UE sulla prestazione energetica in edilizia, impone l’istituzione di un quadro metodologico comparativo per calcolare i livelli ottimali di prestazione energetica degli edifici e degli elementi edilizi in funzione dei costi. L’intervento illustra una delle componenti del quadro metodologico, corrispondente all’individuazione e catalogazione delle misure di efficienza ed introduce l’articolazione della tematica dei costi.

The European Parliament, by the Directive 2010/31/UE on the energy performance of buildings, continues the action (started with Directive 2002/91/EC) to reduce energy consumption and to increase the use of energy from renewable sources in the building sector, in order to reduce the Union’s energy dependency and greenhouse gas emission. The Directive mentions cost optimality as a driver in fixing building energy requirements. Particularly, the Commission established a comparative methodology framework for calculating cost-optimal levels of minimum energy performance requirements for building and buildings elements. With this methodology, Member States have to verify the strictness of their current requirements and periodically review their calculations in time for the review of their requirements. The methodology is articulated around 6 steps: establishment of reference buildings, identification of energy efficiency measures and measures based on RES, calculation of the primary energy demand, calculation of the global cost (in term of Net Present Value), derivation of a cost-optimal level of energy performance and sensitivity analysis on key parameters. The presentation illustrates the processes behind the identification of measures and the calculation of global cost. Particularly measures are divided in four areas, namely building envelope (passive measures), building systems, renewable energy sources and lighting systems. For each measure we consider up to five variants which may be different according to building typology and location. These variants are identified by the value of a parameter. The different values of each parameters correspond to different levels of the measures. Finally, the theme of cost categorization is introduced (initial investment costs, running costs including energy costs and periodic replacement costs, disposal costs). The workshop belongs to a set meetings organized by the European Commission to harmonize and facilitate the application of the methodology by Member States.

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