• Energy Research

The hygrothermal behaviour of an internally insulated historic wall is still hard to predict, mainly because the physical characteristics of the materials composing the historic wall are unknown. In this study, the hygrothermal assessment of an internally thermal insulated masonry wall of an historic palace located in Ferrara, in Italy, is shown. In situ non-destructive monitoring method is combined with a hygrothermal simulation tool, aiming to better analyse and discuss future refurbishment scenarios. In this context, the original U-value of the wall (not refurbished) is decreased from 1.44 W/m2K to 0.26 W/m2K (10 cm stone wool). Under the site specific conditions of this wall, not reached by the sun or rain, it was verified that even in the absence of vapour barrier, no frost damage is likely to occur and the condensation risk is very limited. Authors proposed further discussion based on simulation. The results showed that the introduction of a second gypsum board to the studied technology compensated such absence, while the reduction of the insulation material thickness provides a reduction of RH peaks in the interstitial area by 1%; this second solution proved to be more efficient, providing a 3% RH reduction and the avoidance of further thermal losses.

As cities confront multiple challenges such as climate change, urbanization, and food security, growing attention has been given to sustainable vertical farming and renewable energy solutions. Building facades, typically underutilized in high-density urban environments, present an opportunity for multifunctional buildings composed of both photovoltaic (PV) systems and vertical farming modules. However, on vertical surfaces, these two systems often compete for space. This research focuses on the development of a multifunctional agrivoltaics building envelope (ABE) system, combining building-integrated PV (BIPV) technology with hydroponic vertical farming. This ABE system adopts a modular design approach, where each unit can be prefabricated independently and assembled through an interlocking connection design and bolted fastening to ensure ease of construction and scalability. The design process includes the development of 2D cross-sectional technical design, assembly sequences, and an analysis of key design parameters through 3D modeling. The research adopts a combined Research through Design (RtD) and Research for Design (RfD) approach to bridge prototyping, testing, and performance optimization. This research highlights the potential of integrating renewable energy with agricultural production in building envelope systems. By addressing space optimization and multifunctionality, the research provides a practical framework for future applications in urban sustainability.

Cities, particularly megacities, face significant challenges in transitioning toward sustainability. Many countries have developed dual or multiple capitals for diverse purposes (e.g., political, administrative, economic, touristic, and cultural). Limited research exists on the ‘15-minute city’ (15-MC) concept, particularly in regions like Middle East and North Africa (MENA region). This study evaluates the application of the ‘15-MC’ concept globally and regionally to derive Urban Planning Principles (UPPs) and indicators for livability and accessibility. Using a theoretical framework supported by site visits and quantitative assessments, the research examines two districts in the NAC as case studies. Key UPPs (e.g., proximity to services, mixed-use development, public transport, green spaces, community engagement, local economy, and sustainability) were evaluated along with walkability scores, bike infrastructure, and environmental impact indicators. The results reveal that most services in the two districts are accessible within a 15-minute walk or bike ride. However, essential facilities (e.g., universities and hospitals) exceed this threshold (20–30 min). The green area per inhabitant (17 m2/capita) meets WHO and European recommendations. The NAC has clean, green public transportation and 94.26 km of cycling lanes. For the sustainability indicator, air pollutants (PM10 and NO2) slightly exceed the WHO guidelines, but SO2 and Ozone levels are below the limits. The estimated waste per capita (274 kg) is lower than Cario and other counties. The findings suggest the NAC has the potential to fulfill the 15-MC concept through mixed-use developments, accessibility, and sustainable planning. This study serves for future research and modeling of the NAC when it is fully occupied.

Research and development of cost-effective, high-performance thermal insulation materials for the construction sector has to be focused on their final application. In particular, solutions for refurbishing historic buildings, which represent 40% of the European building stock, have to offer a good compromise between environmental quality, energy efficiency and conservation aspects. In this paper, the experimental assessment of an insulation material based on aerogel technology, recently developed in the European project EFFESUS, is presented with regard to the material's thermal performance, compatibility with historic fabric and reversibility. The overall results obtained in laboratory testing on a real-size mock-up and in a real-world case application indicate that the new material is a promising solution for retrofitting historic buildings, thanks to its thermal properties, easy application, reversibility and material compatibility.

Sustainable pedagogical approaches and practices have changed during the years, generating a set of philosophical, theoretical, and scientific concepts. Inside them, regenerative design is a proactive method based on systemic frameworks and developmental processes for maintaining the integrity of natural ecosystems, also enhancing human life, environmental awareness, social equity, and economic sustainability through the support of codesign techniques. This approach is widely used in architectural design, both for existing and heritage buildings, to address negative impacts of global warming, climate change, urban sprawl, touristic pressure, and other contemporary challenging phenomena. Specific workflows for archaeological sites have been never proposed, despite the fact that these sites face problems and risks completely different from other cultural heritage settings (e.g., physical development, pollution, tourism pressure, vandalism, looting, inappropriate excavations or interventions, lack of maintenance, funding, and legislation). This study presents a multicriteria decision analysis workflow for preserving and regenerating archaeological sites in a sustainable way through a deep understanding of current problems, values, features, and risks at urban and building levels. This method is tested with a pedagogical experiment at the UNESCO Site of Casterseprio (Italy), to investigate the interaction between heritage, environmental, social, and economic dynamics as well as to define its feasibility, applicability, limitations, and opportunities for further developments. The didactic process is supported by a participatory program among the key players of the site (owners, heritage and public authorities, and local associations), to create strong public support and a shared vision of the sustainable regeneration of the area. Differences between traditional and regenerative design processes, key design principles, shared criteria, replicability, novelty, and limitations of the pedagogic approach are also identified. Key findings of the present study are: (i) students need clear and shared design workflows for supporting their design projects; (ii) “regenerative design” involves multilevel dynamic training methodologies that motivate and involve the student while also improving their consciousness; (iii) the cooperation and the involvement of the stakeholders is important to favor a human-centered approach based also on social and economic interactions; (iv) digital technologies are fundamental for quantifying the key performance indicators in each design stage; (v) “regenerative design” boosts long-term planning and financial self-sustainability of the intervention; and (vi) multicultural design teams producing more innovative design ideas.

Abstract From a wide range of bibliography (148 publications composed by books, guidelines, scientific papers, and other documents), the study presents a critical review of the use of the infrared thermography (IRT) survey in the building energy audit. After explaining its historical growth, the applicability of passive and active approaches has been described, considering well-established and emerging techniques, general procedures, types of IR-camera used, technical issues, and limitations. The passive approach is the most common to detect thermally significant defects. Thus, a specific procedure for the energy audit has been reported, matching different standards, guidelines, and professional advice. Similarly, recurring energy related problems are toughly presented (i.e. thermal characterization of buildings; thermal bridging, insulation level, air leakage and moisture detection; indoor temperature and U-value measurements; human comfort assessment). Finally, advantages and potential sources of errors as well as future trends in the use of IRT for the energy audit have been described. The research aims to serve as a reference for energy auditors and thermographers, to decide upon the best procedure for detecting specific energy defects.

The current legislative framework and the recent energy crisis ask for massive applications of renewable energy sources (RES) in the built environment to reduce energy demand, environmental emissions, and energy costs. The uncritical application of these policies, especially on architectural heritage, could generate serious conservation issues, compromising their heritage values, biodiversity, traditional appearance, and materiality. Thus, there is an urgent call to balance architectural heritage preservation with energy production using clear rules, policies, criteria, and heritage-compatible technologies. The present study aims at defining an updated overview of the application of solar, wind, geothermal energy, and bioenergy on architectural heritage. A deep literature review of the studies published in the years 2020–2023 has been performed, identifying main topics, challenges, advanced solutions, and future perspectives. Acceptability, design criteria, and cutting-edge technologies are also illustrated through case studies to better understand practical approaches.

The launch on the market of innovative highly customized products, with a low visual impact colour and aesthetically wise promoted the integration of photovoltaic (PV) systems in protected areas. Despite the aesthetic, economic and energy advances, their integration therein is hampered by several legislative, and procedural barriers. For this reason, the study aims at reconstructing a European, Italian, and Swiss legislative and authorization framework to highlight prospects, potential, limits, and points of contact among such territories. The working methodology is structured in four parts: (i) the reference context's legislative analysis; (ii) definition of authorization processes; (iii) discussion with stakeholders; (iv) critical summary of the results. Thanks also to the introduction of specific targets and economic incentives, policies implemented in all territorial contexts push the use of solar energy in new buildings and restructuring. Several focus groups have been organized to discuss the existing legislation with different professional target groups (Heritage and Public Authorities, Designers). The results show that in Italy, due to the complex and fragmented authorization process, PV implementation slowed down over the years. In Switzerland, however, clearer criteria and simpler procedures encouraged their diffusion. In both territories, stakeholders need more training and updating about PV technologies, integration criteria, and implementation processes.