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Toward Energy Transition: New Paths, Tools and Technologies Applied to Buildings and Urban Context

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "G: Energy and Buildings".

Deadline for manuscript submissions: closed (9 January 2026) | Viewed by 1136

Special Issue Editors


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Guest Editor
Department of Industrial Engineering, University of Naples Federico II, Piazzale Vincenzo Tecchio 80, 80125 Naples, Italy
Interests: building energy efficiency; performance simulation modeling; innovative building plant solutions; integrated construction techniques; innovative HVAC systems; renewable energy technologies; solar heating and cooling systems; concentrating photovoltaic solar thermal systems; polygeneration; development of sustainable and energy-efficient building design; applied thermodynamics and heat transfer
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Guest Editor
Department of Industrial Engineering, University of Naples Federico II, Piazzale Vincenzo Tecchio 80, 80125 Naples, Italy
Interests: passionate about optimizing energy systems and management strategies for zero energy buildings and communities; modelling and techno-economic assessment
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Astronautic, Electric and Energy Engineering (DIAEE), Faculty of Engineering, Sapienza University of Rome, Via Eudossiana 18, 04100 Rome, Italy
Interests: smart cities, SCC smart cities and communities solutions; design for sustainability; lighting; building energy demand; RES (renewable energy source) integration; urban modelling
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Architecture, Construction and Design, Polytechnic University of Bari, 70125 Bari, Italy
Interests: thermal comfort; IAQ; natural ventilation; ventilative cooling; bioclimatic architecture; CFD; low-energy buildings; building energy simulation; building energy-saving; energy-efficient building design; indoor environmental quality; passive cooling; building energy retrofit
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the era of energy transition, modern society faces new challenges in its attempt to make the modern world more sustainable and less impactful on the environment from an energy perspective, while ensuring the regular conduct of human activities and its ongoing growth. Within these challenges, the building sector plays a fundamental role, accounting for over 30% of final energy consumption, when compared to all energy sectors. Aside from representing about one-third of the total consumption, this sector also significantly contributes to emissions of climate-altering substances, which have led, in recent years, to an increase in global average temperatures. Notably, the past months have been characterized by the highest average environmental temperatures ever recorded. Therefore, researchers and scientists have been called upon to develop various technologies and strategies, aimed at improving the energy performance of buildings and their interconnections in the energy systems of densely populated cities. Specifically, various themes related to the promotion of energy communities and the achievement of the goal of zero/positive energy/emission districts are accepted in this Special Issue. Particular interest is also paid to the development and study of interactions between energy distribution networks (electric and/or thermal) and buildings, and to the development of the strategies aimed at maximizing the bidirectionality of such interactions, with the aim of reducing energy dependence on fossil sources.

Topics of interest for publication include, but are not limited to, the following:

  • Innovative building energy systems;
  • Passive strategies for building energy saving;
  • Building integration renewable energy technologies;
  • District heating and cooling systems;
  • Buildings cluster modeling;
  • Positive energy districts;
  • Renewable energy communities;
  • Energy flexibility in city;
  • Urban energy systems;
  • User and building system interaction;
  • Building and grid interaction.

Dr. Giovanni Barone
Dr. Giovanni Francesco Giuzio
Dr. Laura Pompei
Dr. Roberto Stasi
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • building energy efficiency
  • smart cities
  • energy communities
  • building cluster
  • key performance indicators
  • renewable energy technologies
  • building energy retrofit

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Published Papers (1 paper)

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Research

23 pages, 4489 KB  
Article
Towards the EPBD and ETS2 Mandates: Renewable Energy-Driven Retrofit of a Northern Hotel in Italy
by Laura Pompei, Axel Riccardo Massulli, Domiziana Vespasiano and Gianluigi Lo Basso
Energies 2026, 19(3), 707; https://doi.org/10.3390/en19030707 - 29 Jan 2026
Viewed by 370
Abstract
The revised Energy Performance of Buildings Directive (EPBD) has introduced ambitious targets aimed at accelerating the decarbonization of the building sector. In parallel, the forthcoming implementation of the Emission Trading System for buildings and road transport (ETS2) in January 2027 adds a further [...] Read more.
The revised Energy Performance of Buildings Directive (EPBD) has introduced ambitious targets aimed at accelerating the decarbonization of the building sector. In parallel, the forthcoming implementation of the Emission Trading System for buildings and road transport (ETS2) in January 2027 adds a further dimension to the policy landscape. This study investigates three renewable energy retrofit strategies (Scenarios A, B, and C) for a hotel building in northern Italy, assessing their effectiveness in meeting the decarbonization objectives set by the EPBD and ETS2. Scenario A couples photovoltaic generation with an existing gas boiler, Scenario B integrates PV with an electric heat pump for space heating, and Scenario C implements the full electrification of both heating and domestic hot water. The results of the three scenarios are evaluated using selected metrics, such as renewable primary energy consumption (EPren), non-renewable primary energy consumption (EPnren), CO2 emission (CO2), carbon avoidance cost (CAC), levelized cost of energy (LCOE), net present value (NPV), and Emission Trading System (ETS)2. The results show that PV deployment alone provides economic benefits but yields limited reductions in CO2 emissions and non-renewable primary energy consumption due to continued reliance on natural gas. The introduction of a heat pump significantly enhances environmental performance, with reduced fossil fuel consumption, increased renewable energy use, and improved cost-effectiveness of carbon avoidance. The ETS2 has no impact in the case of full electrification, as fossil fuel consumption is completely eliminated. Full electrification achieves the greatest emission reductions and the lowest non-renewable primary energy demand while offering the strongest long-term economic performance. Overall, the analysis demonstrates that combining PV systems with building electrification is essential to achieving deep decarbonization, and that fully electrified configurations present the most robust pathway for compliance with emerging ETS2 policies. Full article
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