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Ramirez Villegas, RicardoORCID iD iconorcid.org/0000-0003-2868-6481
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Publications (4 of 4) Show all publications
Ramírez-Villegas, R., Eriksson, O. & Olofsson, T. (2019). Combined Environmental and Economic Assessment of Energy Efficiency Measures in a Multi-Dwelling Building. Energies, 12(13), Article ID 2484.
Open this publication in new window or tab >>Combined Environmental and Economic Assessment of Energy Efficiency Measures in a Multi-Dwelling Building
2019 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 12, no 13, article id 2484Article in journal (Refereed) Published
Abstract [en]

The aim of this study is to assess how different renovation scenarios affect the environmental and economic impacts of a multi-dwelling building in a Nordic climate, how these aspects are correlated and how different energy carriers affect different environmental impact categories. In order to reduce greenhouse gas emissions, the European Union has set an agenda in order to reduce energy use in buildings. New buildings on the European market have a low replacement rate, which makes building renovation an important factor for achieving the European Union goals. In this study, eight renovation strategies were analyzed following the European Committee for Standardization standards for life cycle assessment and life cycle costs of buildings. This study covers all life cycle steps from cradle to grave. The renovation scenarios include combinations of photovoltaics, geothermal heat pumps, heat recovery ventilation and improved building envelopes. Results show that, depending on the energy carrier, reductions in global warming potential can be achieved at the expense of an increased nuclear waste disposal. It also shows that for the investigated renovation strategies in Sweden there is no correlation between the economic and the environmental performance of the building. Changing energy carriers in Sweden in order to reduce greenhouse gas emissions can be a good alternative, but it makes the system more dependent on nuclear power.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
life cycle assessment; life cycle costs; electricity production; greenhouse gasses; building renovation; nuclear waste
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:hig:diva-30561 (URN)10.3390/en12132484 (DOI)000477034700028 ()2-s2.0-85068478769 (Scopus ID)
Funder
Knowledge Foundation
Note

Funding agency:

- The industrial post-graduate school Reesbe- Byggpartner i Dalarna AB

Available from: 2019-08-23 Created: 2019-08-23 Last updated: 2019-08-23Bibliographically approved
Ramirez Villegas, R., Eriksson, O. & Olofsson, T. (2019). Life Cycle Assessment of Building Renovation Measures: Trade-off between Building Materials and Energy. Energies, 12(3), Article ID 344.
Open this publication in new window or tab >>Life Cycle Assessment of Building Renovation Measures: Trade-off between Building Materials and Energy
2019 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 12, no 3, article id 344Article in journal (Refereed) Published
Abstract [en]

The scope of this study is to assess how different energy efficient renovation strategies affect the environmental impacts of a multi-family house in a Nordic climate within district heating systems. The European Union has set ambitious targets to reduce energy use and greenhouse gas emissions by the year 2030. There is special attention on reducing the life cycle emissions in the buildings sector. However, the focus has often been on new buildings, although existing buildings represent great potential within the building stock in Europe. In this study, four different renovation scenarios were analyzed with the commercially available life cycle assessment software that follows the European Committee for Standardization (CEN) standard. This study covers all life cycle steps from the cradle to the grave for a residential building in Borlange, Sweden, where renewable energy dominates. The four scenarios included reduced indoor temperature, improved thermal properties of building material components and heat recovery for the ventilation system. One finding is that changing installations gives an environmental impact comparable to renovations that include both ventilation and building facilities. In addition, the life cycle steps that have the greatest environmental impact in all scenarios are the operational energy use and the building and installation processes. Renovation measures had a major impact on energy use due to the cold climate and low solar irradiation in the heating season. An interesting aspect, however, is that the building materials and the construction processes gave a significant amount of environmental impact.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
life cycle assessment, building renovation, district heating, environmental impacts, energy efficiency, climate change, energy directive, building materials
National Category
Environmental Analysis and Construction Information Technology
Identifiers
urn:nbn:se:hig:diva-29919 (URN)10.3390/en12030344 (DOI)000460666200012 ()2-s2.0-85060915288 (Scopus ID)
Available from: 2019-06-14 Created: 2019-06-14 Last updated: 2019-08-13Bibliographically approved
Ramirez Villegas, R. (2017). A methodology to assess impacts of energy efficient renovation: a Swedish case study. (Licentiate dissertation). Gävle: Gävle University Press
Open this publication in new window or tab >>A methodology to assess impacts of energy efficient renovation: a Swedish case study
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The European Union aims to reduce energy use and CO2-emissions by 40 % by the year 2030. The building sector has been identified as having a great potential to reduce emission of CO2 by increasing its energy efficiency. Also, there is a growing concern of the buildings environmental performance, that lead to the development of building environmental assessment tools. However, different types of energy sources and confusing environmental impacts affect the decision making when renovating for improved energy efficiency. This study develops and tests a methodology to help decision-makers when considering major renovation of their building stock when connected to adistrict heating system. The proposed methodology is applied and used to investigate how different renovation scenarios affects the building environmental impacts in terms of CO2 emissions and identify and discuss future improvements of the methodology.

The novelty of the method is the expanded system boundaries that include both the distribution and production of district heating and the energy use at a building level. In this way it is possible to compare and weight measures made both at the energy system level and the building level. This work has limited its approach to energy use in buildings, but it is important to bring the life cycle thinking to the methodology. During the choice of the renovation methods it was noticed that the environmental impact of the production of some components in order to reduce the energy use of a building are not insignificant. Even if all the renovation measures considered in this case study are feasible, it is important to determine in which order they are desirable or achievable from an economic point of view. Uncertainty in the future development of energy, and limited economic resources can play an important role in the possibility of energy efficient renovation.

Abstract [sv]

Den Europeiska Unionen har som målsättning att minska energianvändning och utsläpp av växthusgaser med 40 % till året 2030 jämfört med 1990. Byggnader har identifierats som ett område med stor potential för utsläppsminskningar om de energieffektiviseras. Användningen av olika energislag och olika sätt att värdera miljöpåverkan påverkar beslutsfattandet i samband med energieffektivisering.

I studien utvecklas och testas en metodik som kan hjälpa beslutsfattare vid renovering med energieffektivisering inom fjärrvärmeområdet. Först utvecklades en översiktlig metodik vilken inkluderar både byggnadsenergisimulering och energisystemsimulering. Sen implementerades metodiken genom olika renoveringsscenarier och utsläppen av växthusgaser analyserades.

Metodiken visar att det finns en möjlighet att utveckla ett verktyg som kan hjälpa beslutsfattare när energibesparingsstrategier ska implementeras vilka kan bli positiva för både byggnader och fjärrvärmesystemet.

Place, publisher, year, edition, pages
Gävle: Gävle University Press, 2017. p. 22
Series
Studies in the Research Profile Built Environment. Licentiate thesis ; 3
Keywords
Buildings, renovation, greenhouse gases emissions, district heating, energy efficiency, building environmental assessment tools, energy use, heating, Byggnader, renovering, växthusgasutsläpp, fjärrvärme, energieffektivisering, byggnadsmiljöprestanda verktyg, energianvändning, värme
National Category
Environmental Analysis and Construction Information Technology
Identifiers
urn:nbn:se:hig:diva-23953 (URN)978-91-88145-13-0 (ISBN)978-91-88145-14-7 (ISBN)
Presentation
2017-05-29, Rum B:311, Högskolan Dalarna, Borlänge, 13:00
Opponent
Supervisors
Projects
REESBE
Funder
Knowledge Foundation
Available from: 2017-05-08 Created: 2017-05-02 Last updated: 2018-03-13Bibliographically approved
Ramirez Villegas, R., Eriksson, O. & Olofsson, T. (2016). Assessment of renovation measures for a dwelling area - Impacts on energy efficiency and building certification. Building and Environment, 97, 26-33
Open this publication in new window or tab >>Assessment of renovation measures for a dwelling area - Impacts on energy efficiency and building certification
2016 (English)In: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 97, p. 26-33Article in journal (Refereed) Published
Abstract [en]

The European Union has an ambitious plan to reduce energy use and emissions by the year 2030. The building and real estate sectors have a great potential to help reduce emissions by energy efficiency. However, different energy sources and environmental standards affect the decision making of these major renovations in the existing stock. This study investigates how different renovation strategies affect the energy rating of a selected Building Environmental Assessment Tool and analyses the consequences in terms of greenhouse gas emissions for the local district heating system. Both building energy simulations and energy systems cost optimization were used to determine the energy use and local emissions. The results of different renovation scenarios were used to evaluate the rating in the selected tool and the impact in the district heating local emissions. The used methodology illustrates how energy efficient renovation impacts on the district heating system’s local emissions. However, a bias towards resource classification within the Swedish Building Environmental Tool, Miljöbyggnad, needs to be addressed in order to assess the impact of local emissions.

Keywords
Buildings, Renovation, District heating, CO2 emissions, Building environmental assessment tool, Energy source
National Category
Environmental Engineering
Identifiers
urn:nbn:se:hig:diva-20999 (URN)10.1016/j.buildenv.2015.12.012 (DOI)000369678200003 ()2-s2.0-84950276041 (Scopus ID)
Funder
Knowledge Foundation
Available from: 2016-01-11 Created: 2016-01-11 Last updated: 2019-06-17Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-2868-6481

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