Data-driven prediction and optimization toward net-zero and positive-energy buildings: A systematic review

Values and implications of building envelope retrofitting for residential Positive Energy Districts

One piece of the puzzle towards 100 Positive Energy Districts across Europe by 2025: An open-source approach to unveil favourable locations of PV-based PEDs across europe from a techno-economical perspective

As the built environment is among the main contributing sectors to climate change, it is needed to investigate new paradigms to push decarbonization efforts towards the ambitious objectives defined internationally. It is a shared understanding that shifting the perspective from the single building to the district perspective is required to fully take into consideration the complexity of all interactions undergoing within the built environment, thus the concept of Positive Energy District emerged as a district with annual net zero energy import and net zero CO2 emission working towards an annual local surplus production of renewable energy. In this framework, this paper explores the investigation of the potential for achieving the level of Positive Energy District in a group of non-residential buildings in Balaguer, Catalonia, Spain. These buildings, occupying 8,825 m2 in the city centre, require significant refurbishment for improved energy performance. The analysis includes building energy modelling and simulation, renovation studies, several alternative balance calculations, and carbon emissions assessment. The paper also considers mobility and embodied energy and their impact on energy/carbon balances. The results show that Positive Energy Districts carbon and primary energy balances are not met with rooftop PV installations when retrofitting an existing district towards the Positive energy target but further significant PV areas (roughly +50%) are required to meet merely the use stage balances: negative results are traced when mobility and embodied energy are computed. A formulation alternative to the simple mathematical balance to facilitate the diffusion of Positive Energy District as catalyst of urban decarbonisation could be needed, including context factors and alternative systems (e.g., rating systems). 

Renovation assessment of building districts: Case studies and implications to the positive energy districts definition

In the context of the current energy crisis and climate change, the importance of discussions on how to incorporate monument protection into sustainable strategies that mitigate the human impact on the environment and implement renewable sources while preserving cultural values is raised. Through the case study of the Monument Reserve in Bratislava, Slovakia, this article presents the potentials and limits of the integration of photovoltaic systems in historic urban structures that directly affect their feasible participation in smart city and positive energy district concepts by means of energy cooperativeness. This study highlights the most current recommendations and basic principles on how to assess their visual impact and select the most appropriate solutions. Using the datafication process, it analyzes the irradiance of pitched and flat roof polygons of the set area based on their characteristics such as the normal vector azimuth and slope of the rooftops. For this purpose, a 3D morphological model in LOD3 detail and the open-source solar irradiation model r.sun implemented in GRASS GIS / QGIS were used. The data obtained provided an estimate of the output potential to endow the city’s power grid and were compared to the electricity consumption of the particular city district. Furthermore, these data are suitable for designing a customized technical and aesthetic solution for the integration of photovoltaics with respect to cultural sustainability, as well as for decision- and policy makers.

https://www.mdpi.com/2071-1050/15/3/2299/pdf?version=1675164767

Potentials and Limits of Photovoltaic Systems Integration in Historic Urban Structures: The Case Study of Monument Reserve in Bratislava, Slovakia

This paper presents an overview of PED definitions used in five prominent EU programmes and nine PED-relevant projects across Europe. By drawing similarities and finding discrepancies between them, the paper aims to identify the gaps and challenges in existing work. Through systematic comparison, the paper recognises common traces and differences between existing definitions. The main challenges include the definition of PED boundaries, the method for calculating energy balance, the scope of non-energy matters and the assessment of qualitative requirements. As the PED definitions are to be applied to locations with considerably different local contexts, it would be sensible to develop PED definitions in the form of an adaptive framework. This review marks the start of a quest for a universal framework of PED definitions that addresses the existing challenges. The goal is to provide the evidence base for policymakers and other relevant stakeholders in strengthening the PED concept and ease its implementation.

Definitions of Positive Energy Districts: A Review of the Status Quo and Challenges

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Definitions of Positive Energy Districts: A Review of the Status Quo and Challenges