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- Standard Unretrofitted Buildings and Net Zero-Energy ConceptPublication . Aelenei, Daniel; Aelenei, Laura Elena; Santos, M.C. da CostaThere are many different possible combinations of building envelope, utility equipments and onsite energy generation equipments that can lead to net zero-energy performance. For instance, a building with standard design can offset its energy demand by adding a large amount of photovoltaic cells or by improving its energy efficiency rating first and then adding a smaller amount of photovoltaic cells. Despite the second strategy being considered the roadmap to net zeroenergy status, the first scenario is also possible in the actual Portuguese context where laws favor conditions for the installation of PV´s and solar thermal systems. This paper intends to discuss the implications of this fact from a national perspective coupled with the IEA SHC Task 40 - ECBCS Annex 52 vision where authors are active participants.
- Introduction to analysis matrixPublication . Aelenei, Daniel; Aelenei, Laura Elena
- LNEG: National Energy and Geology Laboratory [Poster]Publication . Aelenei, Laura Elena
- Qualitative Assessment Methodology for Positive Energy District Planning GuidelinesPublication . Neumann, Hans-Martin; Garayo, Sergio Díaz; Gaitani, Niki; Vettorato, Daniele; Aelenei, Laura Elena; Borsboom, Judith; Etminan, Ghazal; Kozlowska, Anna; Reda, Francesco; Rose, Jørgen; Tuominen, PekkaABSTRACT: Positive Energy Districts (PEDs) have recently become an important concept for urban development. However, the number of publications on the transfer of the PED concept to practice is still very limited. This conference paper presents an analysis of the current state of the art in guidelines regarding the planning and implementation of PEDs based on the analysis of 25 PED guidelines reported by anonymous contributors, collaborating in the development of the IEA EBC Annex 83 activities. From this analysis, it becomes clear that nearly all documents including were produced in the period 2018–2020. Most guidelines address local and/or regional governments, focusing predominantly on urban development and planning processes or technological solutions, mostly at the scale level of the district or city, and less often at building block or individual building level. Although some of the documents are journal papers with a very narrow view on specific technological design or implementation aspects, seven guidelines can provide city administrations, urban stakeholders, solution providers and research with overall information on and suggestions for the process of planning, implementing, monitoring and evaluation of PEDs, and a description of the potential impact of PEDs. They result of the analysis will serve as baseline for the future work within IEA Annex 83, in particular for drafting IEA Annex 83 guidelines for the planning and implementation of PEDs.
- Solar XXI: Um marco tecnologico em direcção à "Energia Zer0"Publication . Aelenei, Laura Elena
- A integração de energias renováveis nos edifícios "Conceito de NZEB e Smart Cities"Publication . Goncalves, Helder; Aelenei, Laura Elena
- Facade 2018 : AdaptivePublication . Overend, Mauro; Aelenei, Laura Elena; Krstic-Furundzic, Aleksandra; Perino, Marco; Goia, Francesco; Wellershoff, Frank; Attia, Shady; Knaack, Ukrich; Louter, Christian; Luible, Andreas; Gosztonyi, Susanne
- Performance assessment of a building integrated photovoltaic thermal system in Mediterranean climate : a numerical simulation approachPublication . Bot, Karol; Aelenei, Laura Elena; Gomes, Maria da Glória; Silva, CarlosABSTRACT: This study addresses the thermal and energy performance assessment of a Building Integrated Photovoltaic Thermal (BIPVT) system installed on the facade of a test room in Solar XXI, a Net Zero Energy Building (NZEB) located in Lisbon, Portugal. A numerical analysis using the dynamic simulation tool EnergyPlus was carried out for assessing the performance of the test room with the BIPVT integrated on its facade through a parametric analysis of 14 scenarios in two conditions: a) receiving direct solar gains on the glazing surface and b) avoiding direct solar gains on the glazing surface. Additionally, a computational fluid dynamics (CFD) analysis of the BIPVT system was performed using ANSYS Fluent. The findings of this work demonstrate that the BIPVT has a good potential to improve the sustainability of the building by reducing the nominal energy needs to achieve thermal comfort, reducing up to 48% the total energy needs for heating and cooling compared to the base case. The operation mode must be adjusted to the other strategies already implemented in the room (e.g., the presence of windows and blinds to control direct solar gains), and the automatic operation mode has proven to have a better performance in the scope of this work.
- Design strategies for non-residential zero-energy buildings: lessons learned from Task40/Annex 52: towards net zero-energy solar buildingsPublication . Aelenei, Daniel; Aelenei, Laura Elena; Musall, Eike; Cubi, Eduard; Ayoub, Josef; Belleri, AnnamariaNet zero-energy buildings (Net ZEBs) have been the object of various studies in recent years as various countries have set this performance as long-term goal of their energy policies. Designing successful Net ZEBs represents a challenge since the definitions are yet generic, the assessment method and monitoring approach are under development and the literature is relatively scarce about the best sets of solutions for different typologies and climates likely to deliver an actual and reliable performance in terms of energy balance (used consumed vs. generated) on a costeffective basis. The International collaborative research initiative between the Solar Heating and Cooling (SHC) and the Energy Conservation in Buildings and Community Systems (ECBCS) through Task 40/Annex 52 - Towards Net-Zero Energy Solar Buildings-, summarises most of the recent developments in this field. The authors of this article, who are participants in this task, are providing insights from on-going research work on some best practice leading projects which have been the object of an exploratory cross-case analysis in order to facilitate identification of the set of relevant design strategies. The close inspection of the strategies and indicators of the relative performance of the projects revealed interesting features about the combination of design challenges with techniques and technologies responsible for delivering the Zero Energy performance.
- Balanço energético nulo dos edifícios: é fazível?Publication . Aelenei, Laura Elena