Search results for "nZeb"

The redesign of an Italian building to reach net zero energy performances: A case study of the SHC Task 40 - ECBCS Annex 52

2011

In the framework of international actions to reduce the energy requirements and greenhouse gases emissions due to buildings, a new International Energy Agency task has been recently established in order to study Net Zero Energy Buildings (NZEBs). The commonly shared concept of NZEB, is a building whose annual balance of energy consumptions tends to zero. This concept is still too imprecise and the authors of this paper participate to the activities of SubTask B of IEA Task40 with the aim of establishing an internationally agreed understanding on NZEBs. The task is based on a common methodology for identifying and refining design approaches and tools to support industry adoption of innovativ…

A review on optimization and cost-optimal methodologies in low-energy buildings design and environmental considerations

2019

Abstract The topic of low-energy buildings received a widespread and growing interest in last years, thanks to energy saving policies of developed countries. The design of a low-energy building is addressed with energy saving measures and renewable energy generation, but the correct assessment of phenomena occurring in a building usually requires to perform dynamic simulations and to analyze multiple scenarios to attain the optimal solution. The optimality of a technical solution may be subject to contrasting constraints and objectives. For this reason, designers may employ mathematical optimization techniques, a non-familiar topic to most of building designers. In this paper, a review on o…

Life cycle energy performances and environmental impacts of a prefabricated building module

2018

Abstract The paper explores the energy performances and environmental impacts of a prefabricated building module located in Messina (Sicily, Italy) through an approach that combines both the non-steady state building simulation and the Life Cycle Assessment methodology. The building uses renewable energy technologies and is usable in emergency situations or as simply temporary housing. Results show that the building module causes the emission of 1.5 t of CO2eq/m2 and consumes 29.2 GJ/m2 of primary energy during its life cycle. The building achieves the Net Zero Energy Building target even if it has relevant environmental impacts in the materials production stage (72% on average of the total…

Sur la fonction des « sphéroïdes » en tôle de l’Age du bronze

2013

La fonction des quatre sphéroïdes en tôle de bronze de France et de Suisse connus, souvent décrits, n’a jamais été établie. En raison de leur mode de façonnage, de leur technique de montage et du style de leur décoration, ils sont rapprochés ici des sphéroïdes italiens qui sont généralement complets. Ces derniers, découverts en général dans des sépultures, étant interprétés comme des encensoirs, il est proposé de considérer comme tels, avec des réserves du fait de leur état fragmentaire, les exemplaires de France et de Suisse. Ces récipients, datés en France du Bronze final IIIb, connaissent en Italie une évolution qui se prolonge jusqu’au début du VIIe s. av. J.-C. Although the four known …

Refurbishment scenario to shift nearly net ZEBs towards net ZEB target: an Italian case study

2013

Is the NZEB Benchmarking Approach Suitable for Assessing Energy Retrofit Design?

2013

Currently, many effort have been done to enable energy saving issues in building design and many definitions have been introduced for most performing constructions based on energy balance between energy demand and supply. Recently, the Net Zero Energy Building theory has bypassed old Passive House concept but many questions still remain open. Present work aims to estimate how NZEB requirements matching could be affected by the choice of their definition and the choice of weighting factor system, to be count in the energy balance. NZEB concept is mainly referred to new buildings design. Its application to existing buildings is for sure an hard task provided the architecture and physical cons…

Overview and future challenges of nearly zero energy buildings (nZEB) design in Southern Europe

2017

In times of great transition of the European construction sector to energy efficient and nearly zero energy buildings (nZEB), a market observation containing qualitative and quantitative indications should help to fill out some of the current gaps concerning the EU 2020 carbon targets. Next to the economic challenges, there are equally important factors that hinder renovating the existing residential building stock and adding newly constructed high performance buildings. Under these circumstances this paper summarises the findings of a cross-comparative study of the societal and technical barriers of nZEB implementation in 7 Southern European countries. The study analyses the present situat…

Reaching net zero energy at the neighbourhood scale: feasibility studies in the south of Italy

2020

Il concetto di “edificio a energia netta zero” è stato recentemente implementato in tutti i regolamenti dei paesi europei. Tuttavia, l’approccio dettato dall’Europa si concentra principalmente sulla scala dell’edificio singolo, tralasciando alcuni aspetti riguardanti ad esempio l’interazione di generazione e carico tra edifici e le interazioni energetiche tra edifici. L’obiettivo di questo studio consiste nell’applicazione della definizione di net zero energy building ad un gruppo di edifici ubicati nell’Italia meridionale e caratterizzati da una destinazione d’uso variegata. Lo status quo di una ventina di edifici è stato simulato in ambiente energy plus e sono state successivamente selezi…

Impianti energetici in edifici nZEBs: uno studio di LCA

2022

Il presente lavoro descrive l’applicazione della LCA per stimare gli impatti energetici e il global warming potential (GWP) associati a due configurazioni di un edificio nZEB ad uso ufficio che differiscono per la presenza di un sistema di accumulo di energia elettrica. I risultati mostrano che l’impiego del sistema di accumulo consente di ridurre sia l’energia primaria del 2% sia il GWP di circa il 4%. Tuttavia, i vantaggi ambientali che si ottengono sono di ridotta entità a causa della limitata riduzione dell’import conseguibile con il sistema di accumulo (-15%) e della contemporaneità tra generazione e consumo per la maggior parte delle ore di utilizzo dell’edificio. Pertanto, si evidenz…

STRATEGIE PER LA RIQUALIFICAZIONE ENERGETICA DELL’EDILIZIA SCOLASTICA IN CLIMA MEDITERRANEO

2018

Il patrimonio edilizio italiano è composto principalmente da costruzioni realizzate nel secondo dopoguerra, quando la speculazione economica e l’urbanizzazione hanno prodotto edifici con caratteristiche di scarsa qualità architettonica ed energetica. Agire sul rendimento energetico degli edifici esistenti, adattandoli alle caratteristiche richieste dalla normativa, a parità di condizioni di comfort, rappresenta una strategia importante per la riduzione dei consumi energetici e per la tutela dell’ambiente. Attraverso l’applicazione di tecnologie e metodologie innovative e la scelta di investimenti adeguati, il retrofit energetico può rappresentare, oggi, la principale opportunità di crescita…