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Xabat Oregi
Department of Architecture, University of the Basque Country, 20018 Donostia-San Sebastián, Spain

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Journal article
Published: 01 August 2021 in Sustainability
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Current European environmental sustainability standards call for achieving a reduction in energy consumption and CO2 emissions for a horizon set in the year 2050. It has been verified that buildings and cities have a higher incidence in this regard. It is necessary to have tools for initial assessment that can quickly analyse whether the improvement scenarios put forward by different organisations and governments will be able to meet the goals set at European level. Universities are an important factor for the intended change and therefore offer an excellent environment for testing such tools. A case study focusing on a university in northern Spain is presented, through an evaluation tool using 3D models including life-cycle assessment. Different reform scenarios are evaluated for two key years, 2030 and 2050. The novelty lies in considering, not only the impact of the operational phase but also the impact of the different stages of the life cycle and processes, obtaining an impact value closer to reality. The results indicate that, even with major retrofitting and adaptation efforts, the European targets are difficult to achieve by 2050. Moreover, solutions such as biomass help to achieve greenhouse gas reductions but not to improve energy efficiency.

ACS Style

Alba Arias; Iñigo Leon; Xabat Oregi; Cristina Marieta. Environmental Assessment of University Campuses: The Case of the University of Navarra in Pamplona (Spain). Sustainability 2021, 13, 8588 .

AMA Style

Alba Arias, Iñigo Leon, Xabat Oregi, Cristina Marieta. Environmental Assessment of University Campuses: The Case of the University of Navarra in Pamplona (Spain). Sustainability. 2021; 13 (15):8588.

Chicago/Turabian Style

Alba Arias; Iñigo Leon; Xabat Oregi; Cristina Marieta. 2021. "Environmental Assessment of University Campuses: The Case of the University of Navarra in Pamplona (Spain)." Sustainability 13, no. 15: 8588.

Journal article
Published: 26 April 2021 in Journal of Building Engineering
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During the last decade in the European Union, some targets have been set to reduce energy consumption in buildings, promoting the construction of nearly Zero Energy Buildings and under certificates as Passivhaus. Different regulations define indoor comfort, also Passivhaus standards, considered in this study. Previous studies research the risk of overheating in these buildings, particularly during hot seasons, recommending multiple strategies that are described in this project. This study aims to detect the best natural ventilation and shading strategies to mitigate overheating issues during the hot period in a Passivhaus certified residential tower in Bilbao. The study will be carried out by dynamic simulations. It has been analysed different factors in order to quantify their direct impact on the indoor temperature, proving that overheating can occur, especially during the hot season. The research will conclude that corner-oriented and crossed-oriented flats work better than the single-oriented for natural ventilation, producing more renovations per hour. Shading systems work better when located outside and are mobile. When combining the best previous strategies, the temperature achieves Passivhaus limitations, but high airspeed rates occur, preventing users’ comfort. To achieve Passivhaus limitations is necessary to regulate different opening strategies to avoid high airflow rates and combine different passive strategies.

ACS Style

Anna Figueroa-Lopez; Alba Arias; Xabat Oregi; Iñigo Rodríguez. Evaluation of passive strategies, natural ventilation and shading systems, to reduce overheating risk in a passive house tower in the north of Spain during the warm season. Journal of Building Engineering 2021, 43, 102607 .

AMA Style

Anna Figueroa-Lopez, Alba Arias, Xabat Oregi, Iñigo Rodríguez. Evaluation of passive strategies, natural ventilation and shading systems, to reduce overheating risk in a passive house tower in the north of Spain during the warm season. Journal of Building Engineering. 2021; 43 ():102607.

Chicago/Turabian Style

Anna Figueroa-Lopez; Alba Arias; Xabat Oregi; Iñigo Rodríguez. 2021. "Evaluation of passive strategies, natural ventilation and shading systems, to reduce overheating risk in a passive house tower in the north of Spain during the warm season." Journal of Building Engineering 43, no. : 102607.

Conference paper
Published: 08 December 2020 in Blockchain Technology and Innovations in Business Processes
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This paper reports the indoor air operative temperature and relative humidity outcomes of a sixteen-month monitoring campaign of an administrative area in an industrial building in Tolosa (Spain). In a survey, users reported indoor climate dissatisfaction during the working hours, such as severe discomfort in the conference rooms due to excessive cold or overheating, poor indoor air quality or inadequate response of the HVAC systems. Internal operative temperatures and relative humidity have been analysed with and without environmental conditioning systems to study passive performance and effectiveness of active systems. These two parameters have been analysed in hourly intervals, during summer and winter periods. On the basis of the obtained data, the degree of thermal comfort of the users was evaluated, which allowed a comparison between the users’ self-reported perception obtained through surveys and the monitored data. Three different standards were used to assess thermal comfort, namely the European Standard UNE ISO 7730, the Spanish Regulations for thermal installations in buildings and the criteria established by the National Institute for Occupational Safety and Health. The study has made it possible to detect the main aspects that have a direct influence on user discomfort.

ACS Style

Iñigo Rodriguez; Xabat Oregi; Jorge Otaegi. Thermal Comfort Assessment in an Administrative Area of an Industrial Building in Spain. Blockchain Technology and Innovations in Business Processes 2020, 17 -27.

AMA Style

Iñigo Rodriguez, Xabat Oregi, Jorge Otaegi. Thermal Comfort Assessment in an Administrative Area of an Industrial Building in Spain. Blockchain Technology and Innovations in Business Processes. 2020; ():17-27.

Chicago/Turabian Style

Iñigo Rodriguez; Xabat Oregi; Jorge Otaegi. 2020. "Thermal Comfort Assessment in an Administrative Area of an Industrial Building in Spain." Blockchain Technology and Innovations in Business Processes , no. : 17-27.

Journal article
Published: 18 November 2020 in Sustainability
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European Building Codes have transitioned towards Net Zero Energy Building (NZEB) requirements in new constructions, demanding high levels of insulation and airtightness derived from research and standards developed in Northern and Central Europe. The use of these principles in Southern Europe, where solar radiation is greater and building typologies and user behaviour are different, may have had a negative impact in Thermal Comfort and Energy Demand and Consumption. In this study, six dwellings located in a 2018 27-storey Passivhaus-certified building were monitored for a period of 9–18 months in 2019 and 2020. In the spirit of a complete Post-Occupancy Evaluation, a User Comfort Survey was carried out. The obtained data were analysed and fixed-limit and adaptative comfort models were used to assess the compliance of several European Comfort Standards, namely, EN ISO 7730, EN 15251, CIBSE TM:52, CIBSE TM:59 and CIBSE Guide A. Experimental results confirmed the issues reported by occupants in the Comfort Survey, making evident a severe overheating problem which we were able to quantify. In addition to presenting the obtained data and its analysis, this paper discusses the plausible causes and health-related implications of excess heat in NZEB Housing in the Northern Spanish climate.

ACS Style

Iñigo Vidal; Jorge Otaegi; Xabat Oregi. Thermal Comfort in NZEB Collective Housing in Northern Spain. Sustainability 2020, 12, 9630 .

AMA Style

Iñigo Vidal, Jorge Otaegi, Xabat Oregi. Thermal Comfort in NZEB Collective Housing in Northern Spain. Sustainability. 2020; 12 (22):9630.

Chicago/Turabian Style

Iñigo Vidal; Jorge Otaegi; Xabat Oregi. 2020. "Thermal Comfort in NZEB Collective Housing in Northern Spain." Sustainability 12, no. 22: 9630.

Journal article
Published: 01 September 2020 in Environmental and Climate Technologies
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This paper reports the indoor air operative temperature and relative humidity outcomes of a sixteen-month monitoring campaign of an administrative area in an industrial building in Tolosa (Spain). In a survey, users reported indoor climate dissatisfaction during the working hours, such as severe discomfort in the conference rooms due to excessive cold or overheating, poor indoor air quality or inadequate response of the HVAC systems. Internal operative temperatures and relative humidity have been analysed with and without environmental conditioning systems to study passive performance and effectiveness of active systems. These two parameters have been analysed in hourly intervals, during summer and winter periods. On the basis of the obtained data, the degree of thermal comfort of the users was evaluated, which allowed a comparison between the users’ self-reported perception obtained through surveys and the monitored data. Three different standards were used to assess thermal comfort, namely the European Standard UNE-EN ISO 7730, the Spanish Regulations for thermal installations in buildings (RITE) and the criteria established by the National Institute for Occupational Safety and Health (INSHT). The study has made it possible to detect the main aspects that have a direct influence on user discomfort.

ACS Style

Iñigo Rodriguez Vidal; Xabat Oregi; Jorge Otaegi. Thermal Comfort Evaluation of Offices Integrated Into an Industrial Building. Case Study of the Basque Country. Environmental and Climate Technologies 2020, 24, 20 -31.

AMA Style

Iñigo Rodriguez Vidal, Xabat Oregi, Jorge Otaegi. Thermal Comfort Evaluation of Offices Integrated Into an Industrial Building. Case Study of the Basque Country. Environmental and Climate Technologies. 2020; 24 (2):20-31.

Chicago/Turabian Style

Iñigo Rodriguez Vidal; Xabat Oregi; Jorge Otaegi. 2020. "Thermal Comfort Evaluation of Offices Integrated Into an Industrial Building. Case Study of the Basque Country." Environmental and Climate Technologies 24, no. 2: 20-31.

Journal article
Published: 11 May 2020 in Sustainability
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An increasing number of studies apply life-cycle assessment methodology to assess the impact of a new building or to prioritize between different building refurbishment strategies. Among the different hypotheses to consider during the application of this methodology, the selection of the impact indicator is critical, as this choice will completely change the interpretation of the results. This article proposes applying four indicators that allow analysing the results of a refurbishment project of a residential building with the life-cycle approach: non-renewable primary energy use reduction (NRPER), net energy ratio (NER), internal rate of return (IRR), and life-cycle payback (LC-PB). The combination of environmental and economic indicators when evaluating the results has allowed to prioritize among the different strategies defined for this case study. Furthermore, an extensive sensitivity assessment reflects the high uncertainty of some of the parameters and their high influence on the final results. To this end, new hypotheses related to the following parameters have been considered: reference service life of the building, estimated service life of material, operational energy use, conversion factor, energy price, and inflation rate. The results show that the NRPE use reduction value could vary up to −44%. The variation of the other indicators is also very relevant, reaching variation rates such as 100% in the NER, 450% in the IRR, and 300% in the LC-PB. Finally, the results allow to define the type of input or hypothesis that influences each indicator the most, which is relevant when calibrating the prioritization process for the refurbishment strategy.

ACS Style

Xabat Oregi; Rufino Javier Hernández; Patxi Hernandez. Environmental and Economic Prioritization of Building Energy Refurbishment Strategies with Life-Cycle Approach. Sustainability 2020, 12, 3914 .

AMA Style

Xabat Oregi, Rufino Javier Hernández, Patxi Hernandez. Environmental and Economic Prioritization of Building Energy Refurbishment Strategies with Life-Cycle Approach. Sustainability. 2020; 12 (9):3914.

Chicago/Turabian Style

Xabat Oregi; Rufino Javier Hernández; Patxi Hernandez. 2020. "Environmental and Economic Prioritization of Building Energy Refurbishment Strategies with Life-Cycle Approach." Sustainability 12, no. 9: 3914.

Journal article
Published: 21 January 2020 in Sustainability
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The environmental energy sustainability of universities has aroused great interest in recent years. In this study, environmental impact assessment tools are used to analyse the environmental impacts of the University of the Basque Country (UPV/EHU) since 2015 and to identify reform scenarios to make the university more sustainable. University campuses can be considered to be small cities that impact the environment of the cities where they are located. The environmental impacts of the UPV/EHU Gipuzkoa campus and the impacts on the city of Donostia-San Sebastián in which the university is located are analysed. The environmental impacts are calculated using simulation tools based on three-dimensional models of the university campus and the city. These results are compared with actual impact results from monitoring. The simulation results differ from the monitoring results but provide a rapid determination of the best future scenarios for a more sustainable university by taking the impacts on the city into account. This study enables the university to align its efforts with the Covenant of Mayors for Climate and Energy.

ACS Style

Iñigo Leon; Xabat Oregi; Cristina Marieta. Contribution of University to Environmental Energy Sustainability in the City. Sustainability 2020, 12, 774 .

AMA Style

Iñigo Leon, Xabat Oregi, Cristina Marieta. Contribution of University to Environmental Energy Sustainability in the City. Sustainability. 2020; 12 (3):774.

Chicago/Turabian Style

Iñigo Leon; Xabat Oregi; Cristina Marieta. 2020. "Contribution of University to Environmental Energy Sustainability in the City." Sustainability 12, no. 3: 774.

Review article
Published: 02 December 2019 in Journal of Building Engineering
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One of the primary objectives in the refurbishment of buildings is to identify the best combination of Energy Conservation Measures (ECMs) in terms of energy efficiency. The current Building Energy Performance (BEP) simulation tools require a great deal of time and effort because data from multiple sources must be properly combined (e.g., building/urban models, ECM catalogues, weather condition files) in order to create energy simulation models. In addition, the process of manually setting up each scenario in order to obtain the most optimal solution is also a demanding and time-consuming task. The growing presence of the Building Information Model/Modelling (BIM) technologies in the Architecture, Engineering and Construction (AEC) industry, combined with the new capabilities to link and integrate data using Semantic Web technologies, is presented as an alternative to automate the simulation process. In this article, we present a system that takes advantage of the capabilities of these technologies to integrate ECM data into BEP simulation models in an automated way. The system is composed of a catalogue of ECM measures described in Resource Description Framework (RDF) and a software component that facilitates their application in the models. The system has been developed in the context of OptEEmAL, a research project aimed at creating a web platform to facilitate building simulations at a district scale. The applicability of the system is demonstrated in a case study of a district-scale project.

ACS Style

Gonçal Costa; Álvaro Sicilia; Xabat Oregi; Juan Pedrero; Lara Mabe. A catalogue of energy conservation measures (ECM) and a tool for their application in energy simulation models. Journal of Building Engineering 2019, 29, 101102 .

AMA Style

Gonçal Costa, Álvaro Sicilia, Xabat Oregi, Juan Pedrero, Lara Mabe. A catalogue of energy conservation measures (ECM) and a tool for their application in energy simulation models. Journal of Building Engineering. 2019; 29 ():101102.

Chicago/Turabian Style

Gonçal Costa; Álvaro Sicilia; Xabat Oregi; Juan Pedrero; Lara Mabe. 2019. "A catalogue of energy conservation measures (ECM) and a tool for their application in energy simulation models." Journal of Building Engineering 29, no. : 101102.

Journal article
Published: 12 March 2019 in Sustainability
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Energy efficiency and environmental performance optimization at the district level are following an upward trend mostly triggered by minimizing the Global Warming Potential (GWP) to 20% by 2020 and 40% by 2030 settled by the European Union (EU) compared with 1990 levels. This paper advances over the state of the art by proposing two novel multi-objective algorithms, named Non-dominated Sorting Genetic Algorithm (NSGA-II) and Multi-Objective Harmony Search (MOHS), aimed at achieving cost-effective energy refurbishment scenarios and allowing at district level the decision-making procedure. This challenge is not trivial since the optimisation process must provide feasible solutions for a simultaneous environmental and economic assessment at district scale taking into consideration highly demanding real-based constraints regarding district and buildings’ specific requirements. Consequently, in this paper, a two-stage optimization methodology is proposed in order to reduce the energy demand and fossil fuel consumption with an affordable investment cost at building level and minimize the total payback time while minimizing the GWP at district level. Aimed at demonstrating the effectiveness of the proposed two-stage multi-objective approaches, this work presents simulation results at two real district case studies in Donostia-San Sebastian (Spain) for which up to a 30% of reduction of GWP at district level is obtained for a Payback Time (PT) of 2–3 years.

ACS Style

Diana Manjarres; Lara Mabe; Xabat Oregi; Itziar Landa-Torres. Two-Stage Multi-Objective Meta-Heuristics for Environmental and Cost-Optimal Energy Refurbishment at District Level. Sustainability 2019, 11, 1495 .

AMA Style

Diana Manjarres, Lara Mabe, Xabat Oregi, Itziar Landa-Torres. Two-Stage Multi-Objective Meta-Heuristics for Environmental and Cost-Optimal Energy Refurbishment at District Level. Sustainability. 2019; 11 (5):1495.

Chicago/Turabian Style

Diana Manjarres; Lara Mabe; Xabat Oregi; Itziar Landa-Torres. 2019. "Two-Stage Multi-Objective Meta-Heuristics for Environmental and Cost-Optimal Energy Refurbishment at District Level." Sustainability 11, no. 5: 1495.

Book chapter
Published: 01 January 2019 in Handbook of Energy Efficiency in Buildings
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ACS Style

Daniel Aelenei; Laura Aelenei; Rafaela A. Agathokleous; Francesco Asdrubali; Constantinos A. Balaras; Giorgio Baldinelli; Ilaria Ballarini; Umberto Berardi; Paolo Bertoldi; Francesco Bianchi; Fabio Bisegna; Chiara Burattini; Luisa F. Cabeza; Beatrice Castellani; Carlo Cecere; Maurizio Cellura; Heejin Cho; Helena Coch; Paolo Conti; Vincenzo Corrado; Edoardo Currà; Francesco D’Alessandro; Elena G. Dascalaki; Livio De Santoli; Umberto Desideri; Chuanshuai Dong; Luca Evangelisti; Enrico Fabrizio; Prudence Ferreira; Faidra Filippidou; Chiara Foglietta; David Gattie; Paola Gori; Walter Grassi; Claudia Guattari; Franco Gugliermetti; Patxi Hernandez; Pei Huang; Gongsheng Huang; Soteris A. Kalogirou; Katrin Klingenberg; Thomas M. Lawrence; Eleanor S. Lee; Peike Li; Sonia Longo; Roel Loonen; Lin Lu; Pedro J. Mago; Dario Masucci; Benedetta Mattoni; Michele Morganti; Elena Morini; Mojtaba Navvab; Xabat Oregi; Cosimo Palazzo; Stefano Panzieri; Marco Perino; Anna L. Pisello; Andrea Presciutti; Bale V. Reddy; Marc A. Rosen; Federico Rossi; Federica Rosso; Antonella Rotili; Agnese Salvati; Mattheos Santamouris; Samuele Schiavoni; Eva Schito; Valentina Serra; Ashlynn S. Stillwell; Daniele Testi; RuZhu Wang; Graham S. Wright; Hongxing Yang; Xiaoqiang Zhai; Tiantian Zhang. Contributors. Handbook of Energy Efficiency in Buildings 2019, 1 .

AMA Style

Daniel Aelenei, Laura Aelenei, Rafaela A. Agathokleous, Francesco Asdrubali, Constantinos A. Balaras, Giorgio Baldinelli, Ilaria Ballarini, Umberto Berardi, Paolo Bertoldi, Francesco Bianchi, Fabio Bisegna, Chiara Burattini, Luisa F. Cabeza, Beatrice Castellani, Carlo Cecere, Maurizio Cellura, Heejin Cho, Helena Coch, Paolo Conti, Vincenzo Corrado, Edoardo Currà, Francesco D’Alessandro, Elena G. Dascalaki, Livio De Santoli, Umberto Desideri, Chuanshuai Dong, Luca Evangelisti, Enrico Fabrizio, Prudence Ferreira, Faidra Filippidou, Chiara Foglietta, David Gattie, Paola Gori, Walter Grassi, Claudia Guattari, Franco Gugliermetti, Patxi Hernandez, Pei Huang, Gongsheng Huang, Soteris A. Kalogirou, Katrin Klingenberg, Thomas M. Lawrence, Eleanor S. Lee, Peike Li, Sonia Longo, Roel Loonen, Lin Lu, Pedro J. Mago, Dario Masucci, Benedetta Mattoni, Michele Morganti, Elena Morini, Mojtaba Navvab, Xabat Oregi, Cosimo Palazzo, Stefano Panzieri, Marco Perino, Anna L. Pisello, Andrea Presciutti, Bale V. Reddy, Marc A. Rosen, Federico Rossi, Federica Rosso, Antonella Rotili, Agnese Salvati, Mattheos Santamouris, Samuele Schiavoni, Eva Schito, Valentina Serra, Ashlynn S. Stillwell, Daniele Testi, RuZhu Wang, Graham S. Wright, Hongxing Yang, Xiaoqiang Zhai, Tiantian Zhang. Contributors. Handbook of Energy Efficiency in Buildings. 2019; ():1.

Chicago/Turabian Style

Daniel Aelenei; Laura Aelenei; Rafaela A. Agathokleous; Francesco Asdrubali; Constantinos A. Balaras; Giorgio Baldinelli; Ilaria Ballarini; Umberto Berardi; Paolo Bertoldi; Francesco Bianchi; Fabio Bisegna; Chiara Burattini; Luisa F. Cabeza; Beatrice Castellani; Carlo Cecere; Maurizio Cellura; Heejin Cho; Helena Coch; Paolo Conti; Vincenzo Corrado; Edoardo Currà; Francesco D’Alessandro; Elena G. Dascalaki; Livio De Santoli; Umberto Desideri; Chuanshuai Dong; Luca Evangelisti; Enrico Fabrizio; Prudence Ferreira; Faidra Filippidou; Chiara Foglietta; David Gattie; Paola Gori; Walter Grassi; Claudia Guattari; Franco Gugliermetti; Patxi Hernandez; Pei Huang; Gongsheng Huang; Soteris A. Kalogirou; Katrin Klingenberg; Thomas M. Lawrence; Eleanor S. Lee; Peike Li; Sonia Longo; Roel Loonen; Lin Lu; Pedro J. Mago; Dario Masucci; Benedetta Mattoni; Michele Morganti; Elena Morini; Mojtaba Navvab; Xabat Oregi; Cosimo Palazzo; Stefano Panzieri; Marco Perino; Anna L. Pisello; Andrea Presciutti; Bale V. Reddy; Marc A. Rosen; Federico Rossi; Federica Rosso; Antonella Rotili; Agnese Salvati; Mattheos Santamouris; Samuele Schiavoni; Eva Schito; Valentina Serra; Ashlynn S. Stillwell; Daniele Testi; RuZhu Wang; Graham S. Wright; Hongxing Yang; Xiaoqiang Zhai; Tiantian Zhang. 2019. "Contributors." Handbook of Energy Efficiency in Buildings , no. : 1.

Book chapter
Published: 01 January 2019 in Handbook of Energy Efficiency in Buildings
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ACS Style

Patxi Hernandez; Xabat Oregi; Sonia Longo; Maurizio Cellura. Life-Cycle Assessment of Buildings. Handbook of Energy Efficiency in Buildings 2019, 207 -261.

AMA Style

Patxi Hernandez, Xabat Oregi, Sonia Longo, Maurizio Cellura. Life-Cycle Assessment of Buildings. Handbook of Energy Efficiency in Buildings. 2019; ():207-261.

Chicago/Turabian Style

Patxi Hernandez; Xabat Oregi; Sonia Longo; Maurizio Cellura. 2019. "Life-Cycle Assessment of Buildings." Handbook of Energy Efficiency in Buildings , no. : 207-261.

Journal article
Published: 09 August 2018 in Sustainable Cities and Society
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Over the past few years, town planners and architects have been facing increasing demands regarding the performance of urban development projects in terms of environment, quality of life and socio-economic issues. For this reason, several tools capable of assessing their environmental impacts have been developed. NEST (Neighbourhood Evaluation for Sustainable Territories) is a particularly interesting one since it permits performing simultaneous environmental, economic and social analyses at a district scale, in addition to evaluating refurbishment scenarios, with a life cycle perspective. Nowadays, universities can be considered as “small cities” due to their large size, population, and the many complex activities that take place on the campuses; thus, they have a direct and indirect impact on the environment. In this article, the authors present the results obtained from the environmental evaluation of the four campuses of the University of the Basque Country (UPV-EHU), using NEST. First, the evaluation consisted of analysing baseline environmental impacts of the four campuses, and then, in order to reduce environmental impacts, the authors presented numerous refurbishment scenarios for the campuses, according to national and international declarations concerning sustainable development in higher education.

ACS Style

Iñigo Leon; Xabat Oregi; Cristina Marieta. Environmental assessment of four Basque University campuses using the NEST tool. Sustainable Cities and Society 2018, 42, 396 -406.

AMA Style

Iñigo Leon, Xabat Oregi, Cristina Marieta. Environmental assessment of four Basque University campuses using the NEST tool. Sustainable Cities and Society. 2018; 42 ():396-406.

Chicago/Turabian Style

Iñigo Leon; Xabat Oregi; Cristina Marieta. 2018. "Environmental assessment of four Basque University campuses using the NEST tool." Sustainable Cities and Society 42, no. : 396-406.

Journal article
Published: 01 August 2018 in Energy Procedia
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Sustainable energy planning of cities is a complex problem which should address the comparative analysis of alternative future energy scenarios form a social, economic and environmental point of view. In this regard, the development of methods and tools to allow building energy demand characterization of large areas is becoming one of the main challenges in this field. New studies focused on the energy diagnosis of districts and cities with different location and climatic conditions are necessary to calibrate current methods and assumptions, as well as for the replication of the validated method in other cities around the globe. This paper provides a comparative analysis of the results obtained during the sensitivity assessment of a specific tool for the building energy demand characterization at city scale developed by Tecnalia in the European research project PlanHeat for four different European cities. During this calibration process, the influence of the main parameters that can be adjusted within the tool is evaluated and discussed. Results show that the relevance of adjusting properly each parameter varies depending on the climate zone of the city evaluated and other characteristics of the conjunction of buildings included in each district.

ACS Style

Xabat Oregi; Nekane Hermoso; Eneko Arrizabalaga; Lara Mabe; Inigo Munoz. Sensitivity assessment of a district energy assessment characterisation model based on cadastral data. Energy Procedia 2018, 147, 181 -188.

AMA Style

Xabat Oregi, Nekane Hermoso, Eneko Arrizabalaga, Lara Mabe, Inigo Munoz. Sensitivity assessment of a district energy assessment characterisation model based on cadastral data. Energy Procedia. 2018; 147 ():181-188.

Chicago/Turabian Style

Xabat Oregi; Nekane Hermoso; Eneko Arrizabalaga; Lara Mabe; Inigo Munoz. 2018. "Sensitivity assessment of a district energy assessment characterisation model based on cadastral data." Energy Procedia 147, no. : 181-188.

Journal article
Published: 01 August 2018 in Energy and Buildings
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Municipalities play a key role in supporting Europe's energy transition towards a low-carbon economy. However, there is a lack of tools to allow municipalities to easily formulate a detailed energy vision for their city. Nevertheless, most municipalities have access to georeferenced cartographic and cadastre information, including that on basic building characteristics. This article describes an innovative method to calculate and display the current hourly thermal energy demand for each building in a district based on basic cartography, cadastre, and degree-day values. The method is divided into two main blocks: (1) input data processing to obtain geometric information (e.g. geolocation, building and facades’ dimensions) and semantic data (e.g. use, year of construction), and (2) district energy assessment to calculate the thermal energy demand using data obtained in block 1. The proposed method has been applied and tested in the historical district of Antwerp. The reliability and thoroughness of the results obtained using the method are demonstrated based on two different validations: (1) comparison of the results with those calculated using an existing dynamic energy simulation tool, and (2) comparison of the results with the real gas consumption of a partial sector of the selected district. The first validation shows that the average difference between the two methodologies is less than 11% for the heating demand, less than 11% for the cooling demand, and less than 15% for the domestic hot water demand. The second validation shows a 24% difference between the real natural gas consumption and that obtained by new methodology. Finally, the results have been presented to the municipality of Antwerp, which plans to use the method to design the district heating expansion within the city centre. Furthermore, sensitivity assessment was used to determine the relevance of the main input parameters considered in this method, such as the base temperature, energy system schedules, window-to-wall ratio, and solar gains.

ACS Style

Xabat Oregi; Nekane Hermoso; Iñaki Prieto; Jose Luis Izkara; Lara Mabe; Panagiotis Sismanidis. Automatised and georeferenced energy assessment of an Antwerp district based on cadastral data. Energy and Buildings 2018, 173, 176 -194.

AMA Style

Xabat Oregi, Nekane Hermoso, Iñaki Prieto, Jose Luis Izkara, Lara Mabe, Panagiotis Sismanidis. Automatised and georeferenced energy assessment of an Antwerp district based on cadastral data. Energy and Buildings. 2018; 173 ():176-194.

Chicago/Turabian Style

Xabat Oregi; Nekane Hermoso; Iñaki Prieto; Jose Luis Izkara; Lara Mabe; Panagiotis Sismanidis. 2018. "Automatised and georeferenced energy assessment of an Antwerp district based on cadastral data." Energy and Buildings 173, no. : 176-194.

Journal article
Published: 17 April 2018 in EKAIA Euskal Herriko Unibertsitateko Zientzia eta Teknologia Aldizkaria
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Eraikuntza-sektorerako bizi-ziklo analisiaren metodologia estandarizatu arren, ikertzaileek sistemaren irismenaren inguruan sinplifikazio batzuk aplikatzeko joera dute bizi-zikloaren fase batzuk alde batera utziz. Birgaitze energetikoetan, erabilera-etapan jartzen da arreta bereziki, energiaren erabilera murriztea baita birgaitze horien helburu nagusia. Artikulu honek etxebizitzen birgaitze energetikoko proiektuetan, ingurumen- eta ekonomia-inpaktu orokorrarekin alderatuta, bizi-zikloko etapa bakoitzaren garrantzia ebaluatzen du. Azterketa kasuko birgaitze-estrategien analisiaren emaitzen arabera, garraio- eta deuseztatze-etapek garrantzi txikia dutela ikusten da. Eraikuntza-prozesuaren etapak ere garrantzi txikia du ingurumen-azterketan. Ekoizpen-, mantentze- eta ordezkatze-etapek, oro har, garrantzi handiagoa dute, batez ere, ebaluazio ekonomikorako. Sentsibilitate-analisi zabal batek bizi-zikloaren mugak sinplifikatzeak dakartzan zailtasunak erakusten ditu, azterketa hauek klima, eraikinaren tipologia, edo aurreikusitako erabilera-bizitza bezalako aldagaiekin duten lotura zuzena azalduz.

ACS Style

Xabat Oregi; Maitane Otaño; Patxi Hernandez; Rufino Hernandez. Bizi-ziklo analisiaren irismenaren optimizazioa eraikinen birgaitze energetikoen ingurumen- eta ekonomia-analisietan. EKAIA Euskal Herriko Unibertsitateko Zientzia eta Teknologia Aldizkaria 2018, 143 -162.

AMA Style

Xabat Oregi, Maitane Otaño, Patxi Hernandez, Rufino Hernandez. Bizi-ziklo analisiaren irismenaren optimizazioa eraikinen birgaitze energetikoen ingurumen- eta ekonomia-analisietan. EKAIA Euskal Herriko Unibertsitateko Zientzia eta Teknologia Aldizkaria. 2018; ():143-162.

Chicago/Turabian Style

Xabat Oregi; Maitane Otaño; Patxi Hernandez; Rufino Hernandez. 2018. "Bizi-ziklo analisiaren irismenaren optimizazioa eraikinen birgaitze energetikoen ingurumen- eta ekonomia-analisietan." EKAIA Euskal Herriko Unibertsitateko Zientzia eta Teknologia Aldizkaria , no. : 143-162.

Journal article
Published: 01 February 2017 in Energy and Buildings
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Despite the standardization of the life-cycle assessment methodology for the construction sector, analysts tend to apply some simplifications in relation to the system boundaries, omitting some of the life-cycle stages. In particular, for building energy refurbishment projects, there is a general focus on the operational stage, linked to the main objective of reducing operational energy use. This paper evaluates the relevance of each life-cycle stage in relation to the overall environmental and economic impact on residential building energy refurbishment projects. The results from the analysis of the refurbishment strategies at a case study in Spain show the relatively minor importance of the transport and end of life stages. The construction process stage is also of relatively minor importance regarding the environmental performance. The product, maintenance and replacement stages are generally of higher importance, particularly for economic evaluation. An extensive sensitivity analysis demonstrates the difficulties of simplifying the life-cycle boundaries, suggesting that potential simplifications should take into account various parameters, including the climate region, building typologies, and expected service life. As an example, the results have shown that for cold climate zones and buildings, where large energy savings from energy refurbishment strategies can be achieved, the other life-cycle phases are less important and, in most cases, represent less than 10% of life-cycle environmental impacts.This paper is part of the PhD research of Xabat Oregi Isasi who thanks the Basque Government for the financial support given for his PhD research (BFI-2011-92)

ACS Style

Xabat Oregi; Patxi Hernandez; Rufino Hernandez. Analysis of life-cycle boundaries for environmental and economic assessment of building energy refurbishment projects. Energy and Buildings 2017, 136, 12 -25.

AMA Style

Xabat Oregi, Patxi Hernandez, Rufino Hernandez. Analysis of life-cycle boundaries for environmental and economic assessment of building energy refurbishment projects. Energy and Buildings. 2017; 136 ():12-25.

Chicago/Turabian Style

Xabat Oregi; Patxi Hernandez; Rufino Hernandez. 2017. "Analysis of life-cycle boundaries for environmental and economic assessment of building energy refurbishment projects." Energy and Buildings 136, no. : 12-25.

Conference paper
Published: 29 January 2017 in Advances in Intelligent Systems and Computing
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Nowadays municipalities are facing an increasing commitment regarding the energy and environmental performance of cities and districts. The multiple factors that characterize a district scenario, such as: refurbishment strategies’ selection, combination of passive, active and control measures, the surface to be refurbished and the generation systems to be substituted will highly influence the final impacts of the refurbishment solution. In order to answer this increasing demand and consider all above-mentioned district factors, municipalities need optimisation methods supporting the decision making process at district level scale when defining cost-effective refurbishment scenarios. Furthermore, the optimisation process should enable the evaluation of feasible solutions at district scale taking into account that each district and building has specific boundaries and barriers. Considering these needs, this paper presents a multi-objective approach allowing a simultaneous environmental and economic assessment of refurbishment scenarios at district scale. With the aim at demonstrating the effectiveness of the proposed approach, a real scenario of Gros district in the city of Donostia-San Sebastian (North of Spain) is presented. After analysing the baseline scenario in terms of energy performance, environmental and economic impacts, the multi-objective Harmony Search algorithm has been employed to assess the goal of reducing the environmental impacts in terms of Global Warming Potential (GWP) and minimizing the investment cost obtaining the best ranking of economic and environmental refurbishment scenarios for the Gros district.

ACS Style

Diana Manjarres; Lara Mabe; Xabat Oregi; Itziar Landa-Torres; Eneko Arrizabalaga. A Multi-objective Harmony Search Algorithm for Optimal Energy and Environmental Refurbishment at District Level Scale. Advances in Intelligent Systems and Computing 2017, 320 -332.

AMA Style

Diana Manjarres, Lara Mabe, Xabat Oregi, Itziar Landa-Torres, Eneko Arrizabalaga. A Multi-objective Harmony Search Algorithm for Optimal Energy and Environmental Refurbishment at District Level Scale. Advances in Intelligent Systems and Computing. 2017; ():320-332.

Chicago/Turabian Style

Diana Manjarres; Lara Mabe; Xabat Oregi; Itziar Landa-Torres; Eneko Arrizabalaga. 2017. "A Multi-objective Harmony Search Algorithm for Optimal Energy and Environmental Refurbishment at District Level Scale." Advances in Intelligent Systems and Computing , no. : 320-332.

Journal article
Published: 06 October 2016 in Natural Resources Forum
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Nowadays, urbanists are facing increasing demands regarding the performance of urban development projects in terms of environment, quality of life and socio-economic issues. In order to address these increasing demands, actors involved in urban development projects need tools capable of assessing their impacts. These tools should also enable the comparison of all potential scenarios. Taking into account these needs, Nobatek and Tecnalia have developed NEST (Neighbourhood Evaluation for Sustainable Territories), which is one of the first tools that allows for a simultaneous environmental, economic and social analysis at the district scale, with a life-cycle perspective. Using NEST, the authors of this work carried out an environmental and social evaluation of three districts in the city of Donostia, in the framework of the Essai Urbain research project. The evaluation first consisted of analysing baseline environmental impacts of the three districts. Then, with the objective of reducing environmental impacts and increasing social well-being, the authors proposed several refurbishment scenarios for the studied districts, focusing on energy issues. The study was performed in close collaboration with the city of Donostia, which enabled the identification and selection of the most relevant scenarios from an environmental standpoint. Moreover, the NEST software has caught the attention of the project's stakeholders regarding environmental issues. Finally, NEST seems to be an interesting alternative in accounting for sustainable development issues from the early stages of urban development projects.

ACS Style

Xabat Oregi; Maxime Pousse; Lara Mabe; Alexandre Escudero; Iker Mardaras. Sustainability assessment of three districts in the city of Donostia through the NEST simulation tool. Natural Resources Forum 2016, 40, 156 -168.

AMA Style

Xabat Oregi, Maxime Pousse, Lara Mabe, Alexandre Escudero, Iker Mardaras. Sustainability assessment of three districts in the city of Donostia through the NEST simulation tool. Natural Resources Forum. 2016; 40 (4):156-168.

Chicago/Turabian Style

Xabat Oregi; Maxime Pousse; Lara Mabe; Alexandre Escudero; Iker Mardaras. 2016. "Sustainability assessment of three districts in the city of Donostia through the NEST simulation tool." Natural Resources Forum 40, no. 4: 156-168.

Journal article
Published: 01 December 2015 in Energy Procedia
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Within the European collaboration project SUSREG a number of software tools for sustainable urban planning were applied and tested in the context of real case studies. Three types of ICT tools can be distinguished: Neighbourhood Sustainability Assessment Tools, Rating systems and LCA-LCC Tools. We discuss in more detail the Autodesk Ecotect Analysis tool, as applied in the case study of an old railway area in Burgos, Spain. The second tool is GPR Urban Planning, which was applied to a city expansion plan for the City of Nijmegen, The Netherlands. We conclude that ICT tools are often applied rather late in the planning process which neglects their potential advantages with respect to integral assessment and stakeholder communication.

ACS Style

Xabat Oregi; Esther Roth; Erik Alsema; Maarten van Ginkel; David Struik. Use of ICT Tools for Integration of Energy in Urban Planning Projects. Energy Procedia 2015, 83, 157 -166.

AMA Style

Xabat Oregi, Esther Roth, Erik Alsema, Maarten van Ginkel, David Struik. Use of ICT Tools for Integration of Energy in Urban Planning Projects. Energy Procedia. 2015; 83 ():157-166.

Chicago/Turabian Style

Xabat Oregi; Esther Roth; Erik Alsema; Maarten van Ginkel; David Struik. 2015. "Use of ICT Tools for Integration of Energy in Urban Planning Projects." Energy Procedia 83, no. : 157-166.

Journal article
Published: 05 May 2015 in Buildings
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The life cycle assessment (LCA) method is a powerful tool that can serve to aid decision making regarding the environmental benefits of refurbishment projects. However, due to the relative complexity of LCA studies, simplified LCA methodologies are frequently used, focusing on just some of the building life cycle phases or a reduced number of indicators. The most common and widespread simplification is to only evaluate the differences a refurbishment project makes on the operational energy use of the building. This paper compares the results of applying full LCA, simplified LCA and operational energy use assessment in a refurbishment case study. Results show that simplified LCA methodologies including building use phase and product manufacturing phase can generally be sufficiently accurate to aid decision making for building energy refurbishment, as other building life cycle phases related to transport of products, on site construction, deconstruction or end of life represent a generally negligible part of the total life cycle impacts, both in terms of resource use or environmental impacts. Barriers and benefits of applying simplified LCA approaches to building energy refurbishment projects are subsequently discussed.

ACS Style

Xabat Oregi; Patxi Hernandez; Cristina Gazulla; Marina Isasa. Integrating Simplified and Full Life Cycle Approaches in Decision Making for Building Energy Refurbishment: Benefits and Barriers. Buildings 2015, 5, 354 -380.

AMA Style

Xabat Oregi, Patxi Hernandez, Cristina Gazulla, Marina Isasa. Integrating Simplified and Full Life Cycle Approaches in Decision Making for Building Energy Refurbishment: Benefits and Barriers. Buildings. 2015; 5 (2):354-380.

Chicago/Turabian Style

Xabat Oregi; Patxi Hernandez; Cristina Gazulla; Marina Isasa. 2015. "Integrating Simplified and Full Life Cycle Approaches in Decision Making for Building Energy Refurbishment: Benefits and Barriers." Buildings 5, no. 2: 354-380.