Browsing by Keyword "Sustainability"
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Item Comprehensive study on the most sustainable concrete design made of recycled concrete, glass and mineral wool from C&D wastes(2021-03-01) Gebremariam, Abraham T.; Vahidi, Ali; Di Maio, Francesco; Moreno-Juez, J.; Vegas-Ramiro, I.; Łagosz, Artur; Mróz, Radosław; Rem, Peter; TRAZABILIDAD CIRCULAR; GENERALThis study focuses on formulating the most sustainable concrete by incorporating recycled concrete aggregates and other products retrieved from construction and demolition (C&D) activities. Both recycled coarse aggregates (RCA) and recycled fine aggregates (RFA) are firstly used to fully replace the natural coarse and fine aggregates in the concrete mix design. Later, the cement rich ultrafine particles, recycled glass powder and mineral fibres recovered from construction and demolition wastes (CDW) are further incorporated at a smaller rate either as cement substituent or as supplementary additives. Remarkable properties are noticed when the RCA (4–12 mm) and RFA (0.25–4 mm) are fully used to replace the natural aggregates in a new concrete mix. The addition of recycled cement rich ultrafines (RCU), Recycled glass ultrafines (RGU) and recycled mineral fibres (RMF) into recycled concrete improves the modulus of elasticity. The final concrete, which comprises more than 75% (wt.) of recycled components/materials, is believed to be the most sustainable and green concrete mix. Mechanical properties and durability of this concrete have been studied and found to be within acceptable limits, indicating the potential of recycled aggregates and other CDW components in shaping sustainable and circular construction practices.Item Economic Evaluation of PV Installations for Self-Consumption in Industrial Parks(2021-01-30) Pedrero, Juan; Hernández, Patxi; Martínez, Álvaro; PLANIFICACIÓN ENERGÉTICAThis paper presents an analysis of the economic performance of photovoltaic (PV) selfconsumption systems at an industrial park in the Basque Country (north of Spain). The economic feasibility of the installations is largely dependent on self-consumption and compensation due to electricity injected into the grid, as well as the assumed evolution of the electricity prices. A sensitivity analysis is carried out for different installation sizes and different evolution scenarios concerning electricity prices. The potential for installations for shared self-consumption with dynamic and static distribution coefficients is also analyzed. The results show that medium sized installations are generally a cost effective way to reduce energy bills, while the economic performance of larger installations is more uncertain, and is largely dependent on the selling price for electricity injected into the grid. This case study found that the economic benefits of shared self-consumption between different companies are substantial, and are slightly more favorable when applying dynamic distribution factors.Item Sustainable Strategic Urban Planning: Methodology for Urban Renovation At District Level: Methodology for Urban Renovation at district level(International Solar Energy Society, 2017) Vallejo, Estefanía; Criado, Cristina; Arrizabalaga, Eneko; Vasallo, Ali; Renne, David; Griffiths, Steven; Romero, Manuel; Guthrie, Ken; Mugnier, Daniel; PLANIFICACIÓN ENERGÉTICASustainable urban renovation is characterized by multiple factors (e.g. technical, socio-economic, environmental and ethical perspectives), different spatial scales and a number of administrative structures that should address the evaluation of alternative scenarios or solutions. This defines a complex decision problem that includes different stakeholders where several aspects need to be considered simultaneously. In spite of the knowledge and experiences during the recent years, there is a need of methods that lead the decision-making processes. In response, a methodology based on the global idea and implications of working towards a more sustainable and energy efficient cities as a holistic procedure for urban renovation at district level is proposed in the European Smart City project CITyFiED. The methodology has the energy efficiency as main pillar and the local authorities as client. It is composed of seven phases that ensures an effective dialogue among all the stakeholders, aiming to understand the objectives and needs of the city to define a set of Strategies for Sustainable Urban Renovation and their integration within the Strategic Urban Planning of the cities.