As illustrated in the European directive 2010/31/EU nearly Zeb means reducing energy loads and using renewable resources. Although an operational framework is not yet consistent in term of definition and methodology, research is moving towards Nzeb based on three main principles: system boundary, metrics and criteria. The system boundary is the link between the building and the energy supply system (footprint/on-site/off-site production). Metrics define the accuracy level of the analysis, while criteria help to set the most accurate assessment methodology in order to evaluate and rate the energy and environmental building performances. Therefore, the choice of a suitable method of analysis for the assessment of energy and environmental building performance is an essential issue and it can be influenced by the purposes of the study or by the architecture features. Nzeb’s assessment methods should take into consideration: goals and scope of the analysis, time frame of the energy balance, expected duration of comfort state, variable factors influencing the energy bal-ance (i.e. comfort level, climate, etc.) (Sartori et al., 2012). The energy efficiency fulfil-ment is limited to the computation of energy imported and exported during the opera-tional phase of the building. However, this initial vision based on the reduction of en-ergy consumption in the use stage of Nzeb, gradually spreads to encompass a wider per-spective of the whole building life cycle. It means more complexity, due to the evaluation of energy and resource demand and impacts for individually life cycle stages (operable via Lca normed by Iso 14040-44), but it means also to reduce the burden shift between single life cycle stages. The energy consumptions of the life cycle stages are interrelated, thus, by limiting the system boundary to the management phase, the consumption gener-ated in the pre-management stage, attributable to the production of materials or con-struction of industrial and power plants, is neglected. This aspect is not explicitly cov-ered in the European directive 2010/31/EU, but is nevertheless implicit in the reference to a cost-benefit analysis that includes operational energy consumption and energy re-quired for construction.

L’approccio nearly Zeb, secondo la direttiva europea 2010/31/EU, è finalizzato all’abbattimento del fabbisogno energetico in fase d’uso e alla riduzione degli impatti ambientali tramite l’uso di fonti rinnovabili. Nonostante il quadro appli-cativo sia ancora disomogeneo, in termini di definizioni e metodologie di calco-lo, si sta delineando un asse operativo per raggiungere gli obiettivi Nzeb1. Pos-siamo evidenziare tre elementi portanti: il confine, la metrica e il criterio. Il confine dovrà essere rappresentato dal sistema di approvvigionamento energe-tico (generazione nell’impronta dell’edificio, on-site, off-site) e dalla definizio-ne delle fasi del ciclo di vita che si vogliono valutare. La metrica definisce il livello di accuratezza che s’intende raggiungere secondo gli obiettivi. Il criterio, infine, stabilisce la metodologia di valutazione energetica più opportuna per ottenere l’indice di prestazione globale dell’edificio.

Valutazione delle prestazioni energetico-ambientali per l'architettura nearly zero energy

MONTICELLI, CAROL;
2016-01-01

Abstract

As illustrated in the European directive 2010/31/EU nearly Zeb means reducing energy loads and using renewable resources. Although an operational framework is not yet consistent in term of definition and methodology, research is moving towards Nzeb based on three main principles: system boundary, metrics and criteria. The system boundary is the link between the building and the energy supply system (footprint/on-site/off-site production). Metrics define the accuracy level of the analysis, while criteria help to set the most accurate assessment methodology in order to evaluate and rate the energy and environmental building performances. Therefore, the choice of a suitable method of analysis for the assessment of energy and environmental building performance is an essential issue and it can be influenced by the purposes of the study or by the architecture features. Nzeb’s assessment methods should take into consideration: goals and scope of the analysis, time frame of the energy balance, expected duration of comfort state, variable factors influencing the energy bal-ance (i.e. comfort level, climate, etc.) (Sartori et al., 2012). The energy efficiency fulfil-ment is limited to the computation of energy imported and exported during the opera-tional phase of the building. However, this initial vision based on the reduction of en-ergy consumption in the use stage of Nzeb, gradually spreads to encompass a wider per-spective of the whole building life cycle. It means more complexity, due to the evaluation of energy and resource demand and impacts for individually life cycle stages (operable via Lca normed by Iso 14040-44), but it means also to reduce the burden shift between single life cycle stages. The energy consumptions of the life cycle stages are interrelated, thus, by limiting the system boundary to the management phase, the consumption gener-ated in the pre-management stage, attributable to the production of materials or con-struction of industrial and power plants, is neglected. This aspect is not explicitly cov-ered in the European directive 2010/31/EU, but is nevertheless implicit in the reference to a cost-benefit analysis that includes operational energy consumption and energy re-quired for construction.
2016
Cluster in progress. La Tecnologia dell'architettura in rete per l'innovazione / The Architectural technology network for innovation
9788891612496
L’approccio nearly Zeb, secondo la direttiva europea 2010/31/EU, è finalizzato all’abbattimento del fabbisogno energetico in fase d’uso e alla riduzione degli impatti ambientali tramite l’uso di fonti rinnovabili. Nonostante il quadro appli-cativo sia ancora disomogeneo, in termini di definizioni e metodologie di calco-lo, si sta delineando un asse operativo per raggiungere gli obiettivi Nzeb1. Pos-siamo evidenziare tre elementi portanti: il confine, la metrica e il criterio. Il confine dovrà essere rappresentato dal sistema di approvvigionamento energe-tico (generazione nell’impronta dell’edificio, on-site, off-site) e dalla definizio-ne delle fasi del ciclo di vita che si vogliono valutare. La metrica definisce il livello di accuratezza che s’intende raggiungere secondo gli obiettivi. Il criterio, infine, stabilisce la metodologia di valutazione energetica più opportuna per ottenere l’indice di prestazione globale dell’edificio.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1017032
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