1,720,995 research outputs found
Assessment of cost-optimal energy performance requirements for the Italian residential building stock
Full text linkDirective 2010/31/EU establishes that Member States must ensure that minimum energy performance requirements for buildings are set with a view to achieve cost-optimal levels. The paper presents a methodology for identifying the cost-optimal levels for the Italian residential building stock, following the Guidelines accompanying the Commission Delegated Regulation No. 244/2012. The methodology is applied to a reference building of the IEE-TABULA project and considering different energy efficiency measures. The energy performance and the global cost calculations are performed according to UNI/TS 11300 and EN 15459, respectively. A new cost optimisation procedure based on a sequential search-optimisation technique considering discrete options is applied
Application of the comparative methodology for the definition of individual building elements energy requirements in Italy
Full text linkDirective 2010/31/EU establishes that Member States must ensure that minimum energy performance requirements for buildings as well as for individual building elements are set with a view to achieve cost-optimal levels. The comparative methodology is here applied to two reference buildings; different energy efficiency measures are considered one at a time in order to find the optimality in terms of costs/benefits; results are then discussed. The definition of the individual building elements refurbishment cost/benefits effectiveness wants to address building administrations to define suitable energy requirements as well as economic incentives, as to promote the energy consumption reduction according to EU requirements
Prestazione termica dinamica dei componenti edilizi in regime di sollecitazione dinamica: modelli di calcolo a confronto
No full textCost-optimal approach to transform the public buildings into nZEBs: an European cross-country comparison
Full text linkA cross-country comparison of the RePublic_ZEB project results is presented. The paper reports on the energy efficiency measures and on the options considered for the refurbishment of the public buildings taken as representative of the building stock in the countries involved in the project. The nZEB solutions are compared in terms of adopted energy efficiency measures; moreover, the nZEBs are quantitatively defined through a set of energy, economic and environmental parameters. The paper aims at giving an overview on the meaning of nZEB in the European context, and on its energy and economic feasibility for real public existing buildings
La nuova legislazione sull'efficienza energetica degli edifici. Requisiti e metodi di calcolo
No full textLivelli ottimali di costo per i requisiti di prestazione energetica degli edifici
Full text linkL'articolo presenta la metodologia per l'analisi comparativa messa a punto ed applicata ad edifici di riferimento su scala nazionale con il proposito di determinare livelli ottimali di costo da utilizzare come metro per la formulazione di prescrizioni energetiche in ambito edilizi
New equivalent parameters for thermal characterization of opaque building envelope components under dynamic conditions
No full textAs reported in the scientific literature and mentioned in building energy performance legislation, the thermal inertia of the opaque building envelope can have a significant positive impact on the reduction of summer indoor overheating, of space cooling peak load and of electricity consumption. At the early stages of the envelope design, there is a need to use simplified as well as effective parameters to correctly characterize the thermal performance of the opaque envelope under dynamic conditions. In this work, a new methodology to describe the dynamic thermal behavior of opaque components is proposed. The approach is based on the harmonic parameters specified in ISO 13786 but it also takes into account realistic boundary conditions for different orientations and solar absorptance values. New equivalent thermal parameters are determined by means of dynamic simulations. The use of these parameters to assess the conduction heat flow rate by means of a simplified model is validated through a comparison with the results of a dynamic simulation. The method presented in the article represents an improvement with respect to the parameters usually applied at the early design stage to thermally characterize the opaque envelope of the building under dynamic conditions. In fact, it allows simplified but reliable performance parameters referring to actual boundary conditions to be obtained. The application potential of the proposed methodology lies in the drawing-up of catalogues and technical standards that supply the values of the new equivalent thermal parameters for different technical solutions
Livelli ottimali in funzione dei costi dei requisiti energetici ed edifici di riferimento
Full text linkIn ambito europeo i principi relativi al miglioramento della prestazione energetica degli edifici sono definiti nella direttiva 2002/91/UE (EPBD), così come riformulata dalla direttiva 2012/31/UE (EPBD recast). Tra i vari chiarimenti e prescrizioni, la EPBD recast ha introdotto a livello nazionale, un meccanismo di analisi comparativa con il proposito di determinare livelli ottimali di costo da utilizzare come metro per la formulazione di prescrizioni energetiche in ambito edilizio.
L’articolo è incentrato sull’esposizione e sulla metodologia di applicazione da parte degli Stati Membri del quadro metodologico comparativo per il calcolo dei livelli ottimali in funzione dei costi per i requisiti minimi di prestazione energetica degli edifici e degli elementi edilizi, così come formulato dal Regolamento delegato (UE) N. 244/2012 e dalle linee guida (Orientamento della Commissione del 19 aprile 2012) ad esso associate, entrambi documenti emanati in ausilio all’applicazione della EPBD recast.
L’articolo espone infine il caso italiano, delineando l’attività svolta da parte del gruppo di lavoro tecnico formato da CTI, ENEA ed RSE istituito presso il Ministero dello Sviluppo Economico, per l’attuazione della Direttiva 31/2010/EU: sulla base di quanto stabilito dalla Commissione Europea, tale gruppo di lavoro si sta adoperando per la definizione della metodologia comparativa da applicare ad edifici di riferimento su scala nazionale, al fine dell’ottenimento dei suddetti cost-optimal levels
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