Dalarna University's logo and link to the university's website

du.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Energy efficient renovation in a life cycle perspective: A case study of a Swedish multifamily-building
Dalarna University, School of Information and Engineering, Energy Technology. Högskolan i Gävle, Energisystem och byggnadsteknik.ORCID iD: 0000-0003-2868-6481
2021 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Energy use in the European Union is increasing. At the same time, it is estimated that by the year 2050 most of the EU population will be living in currently existing buildings. Some of these buildings are or will be in need of renovation, and they have identified a target to reduce overall energy use. The urgency of climate change also makes it highly relevant and important to improve buildings resource and energy efficiency. This thesis aims to explain how different proposed energy efficient renovation strategies affect the energy use at different system levels, the potential environmental impacts of these alternatives, how they are connected to economic impacts and the implications of using a commercial LCA software to answer these questions from a research perspective.

In order to answer the questions above, the effect of different renovation strategies were studied by combining building energy simulations, energy system simulations, a building environmental assessment tool, life cycle assessment and life cycle cost calculations. These tools are used in order to provide an overview of how the different renovation strategies affect the production of district heating, greenhouse gas (GHG) emissions and the environmental and economic performance of the building.

The results show that the selected renovation strategies reduce energy use by decreasing transmission losses, while reducing the total amount of purchased energy by using solar energy or by changing energy carriers. These different approaches have the potential to reduce the environmental impact, mainly by reducing global warming potential, acidification potential and eutrophication potential and to some extent abiotic depletion potential. However, when changing energy carriers there is a burden shift to radioactive waste disposed. When the economic aspects are analyzed, it is shown that there is no simple correlation between financial and environmental impacts.

To analyze a building from a life cycle perspective can help to identify the advantages and disadvantages of energy efficient renovation from the building owner’s perspective as well as from a societal perspective. Applying a life cycle perspective is therefore important for building owners, building companies and practitioners as well for policy makers to avoid suboptimisation.

Abstract [sv]

Energianvändningen inom den Europeiska Unionen ökar. Samtidigt, beräknas att år 2050 så bor merparten av EU:s befolkning i byggnader som finns idag. En del av dessa byggnader behöver renoveras eller kommer att var i behov av renovering, och dessa är identifierade som ett mål för att minska energianvändning. Klimatförändringens akuta karaktär ökar också relevansen och betydelsen av att ha mer resurs- och energieffektiva byggnader. Denna avhandlings mål är att förklara hur olika energieffektiva renoveringsstrategier påverkar energianvändningen på olika systemnivåer, vilken är den potentiella miljöpåverkan av dessa alternativ, hur detta är kopplat till ekonomisk påverkan och vika är implikationerna av att använda en kommersiell mjukvara för att besvara dessa frågor ur ett forskningsperspektiv.

För att svara på dessa frågor studeras effekten av olika renoveringsstrategier genom av kombinera byggnadsenergisimuleringar, energisystemssimuleringar, system för miljöcertifiering av byggnader, livscykelanalys och beräkningar av livscykelkostnader. Dessa verktyg används för att ge en överblick över hur olika renoveringsstrategier påverkar produktionen av fjärrvärme, utsläpp av växthusgaser och byggnadens miljömässiga och ekonomiska prestanda. Resultaten visar att de valda renoveringsstrategierna minskar energianvändningen genom att minska transmissionsförlusterna, och minskar behovet av köpt energi genom användning av solenergi och genom att byta energibärare. Dessa olika strategier har potential av minska miljöpåverkan i termer av klimatpåverkan, försurning, övergödning och till viss del utarmning av abiotiska tillgångar. Ett byte av energibärare medför dock att bördan skiftas till deponerat radioaktivt avfall. När de ekonomiska aspekterna analyseras visar det sig att det inte finns en enkel korrelation mellan dessa och miljöpåverkan.

Att analysera byggnader utifrån ett livscykelperspektiv kan hjälpa till att identifiera för- och nackdelar med energieffektiv renovering från fastighetsägarens perspektiv, men också från ett samhällsperspektiv. Att använda livscykelperspektiv är följaktligen viktigt för att fastighetsägare, byggföretag, konsulter och beslutfattare ska kunna undvika suboptimering.

Place, publisher, year, edition, pages
Gävle: Gävle University Press , 2021. , p. 62
Keywords [en]
Buildings, renovation, greenhouse gas emissions, district heating, energy efficiency, building environmental assessment tools, energy use, space heating, life cycle assessment, life cycle costing, payback, scenarios simulation
Keywords [sv]
Byggnadsrenovering, växthusgasutsläpp, fjärrvärme, energieffektivitet, system för miljöcertifiering av byggnader, energianvändning, byggnadsuppvärmning, livscykelanalys, livscykelkostnader, återbetalning, scenariosimulering
National Category
Energy Systems Environmental Analysis and Construction Information Technology
Research subject
Energy and Built Environments, Reesbe företagsforskarskola
Identifiers
URN: urn:nbn:se:du-36176ISBN: 978-91-88145-60-4 (print)ISBN: 978-91-88145-61-1 (electronic)OAI: oai:DiVA.org:du-36176DiVA, id: diva2:1529117
Public defence
2021-02-24, Room 322, Borlänge, 13:00 (English)
Opponent
Supervisors
Available from: 2021-02-17 Created: 2021-02-17 Last updated: 2023-04-14Bibliographically approved
List of papers
1. An approach to illustrate strategies for improved energy efficiency at the municipal level
Open this publication in new window or tab >>An approach to illustrate strategies for improved energy efficiency at the municipal level
2014 (English)In: Proceedings from the 14th International Symposium on District Heating and Cooling: Proceedings from the14th InternationalSymposium on District Heating and Cooling September, 6-10, 2014 Stockholm, SWEDEN / [ed] Anna Land, Swedish District Heating Association, 2014, p. 50-55Conference paper, Published paper (Refereed)
Keywords
Energy Efficiency, District Heating, Decision making, Million programme
National Category
Energy Engineering
Research subject
Energy and Built Environments, Reesbe företagsforskarskola
Identifiers
urn:nbn:se:du-16541 (URN)9789185775248 (ISBN)
Conference
14th International Symposium on District Heating and Cooling
Projects
REESBE
Funder
Knowledge Foundation
Available from: 2014-12-17 Created: 2014-12-17 Last updated: 2021-11-12Bibliographically approved
2. Assessment of renovation measures for a dwelling area: impacts on energy efficiency and building certification
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. © 2015 Elsevier Ltd.

Keywords
Buildings; Carbon dioxide; Decision making; District heating; Gas emissions; Greenhouse gases; Heating; Heating equipment, Building energy simulations; Building environmental assessment tool; Different energy sources; Energy source; Energy-efficient renovations; Environmental standards; Renovation; Resource classification, Energy efficiency, carbon emission; certification; emission control; energy efficiency; environmental assessment; heating; repair, Sweden
National Category
Civil Engineering
Research subject
Research Profiles 2009-2020, Energy and Built Environments
Identifiers
urn:nbn:se:du-20651 (URN)10.1016/j.buildenv.2015.12.012 (DOI)000369678200003 ()2-s2.0-84950276041 (Scopus ID)
Available from: 2016-01-11 Created: 2016-01-11 Last updated: 2021-11-12Bibliographically approved
3. Life cycle assessment of building renovation measures–trade-off between building materials and energy
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, E-ISSN 1996-1073, Vol. 12, no 3, article id 344Article in journal (Refereed) Published
National Category
Environmental Engineering Civil Engineering
Research subject
Research Profiles 2009-2020, Energy and Built Environments
Identifiers
urn:nbn:se:du-29526 (URN)10.3390/en12030344 (DOI)000460666200012 ()2-s2.0-85060915288 (Scopus ID)
Available from: 2019-02-19 Created: 2019-02-19 Last updated: 2023-08-28Bibliographically approved
4. Combined environmental and economic assessment of energy efficiency measures in a multi-dwelling building
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, 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.

Keywords
Building renovation, Electricity production, Greenhouse gasses, Life cycle assessment, Life cycle costs, Nuclear waste
National Category
Environmental Analysis and Construction Information Technology
Research subject
Research Profiles 2009-2020, Energy and Built Environments
Identifiers
urn:nbn:se:du-30499 (URN)10.3390/en12132484 (DOI)000477034700028 ()2-s2.0-85068478769 (Scopus ID)
Note

Open Access APC beslut 10/2019

Available from: 2019-06-28 Created: 2019-06-28 Last updated: 2023-08-28Bibliographically approved
5. Environmental payback of renovation strategies in a northern climate-the impact of nuclear power and fossil fuels in the electricity supply
Open this publication in new window or tab >>Environmental payback of renovation strategies in a northern climate-the impact of nuclear power and fossil fuels in the electricity supply
2019 (English)In: Energies, E-ISSN 1996-1073, Vol. 13, no 1, article id 80Article in journal (Refereed) Published
National Category
Energy Engineering
Research subject
Research Profiles 2009-2020, Energy and Built Environments
Identifiers
urn:nbn:se:du-31610 (URN)10.3390/en13010080 (DOI)000520425800080 ()2-s2.0-85077301830 (Scopus ID)
Available from: 2020-01-14 Created: 2020-01-14 Last updated: 2023-08-28Bibliographically approved

Open Access in DiVA

fulltext(1776 kB)360 downloads
File information
File name FULLTEXT01.pdfFile size 1776 kBChecksum SHA-512
34e80f92a6cffd4f433d82bbbf09c24e2c11ae2bc9fe4c9c24fef0761211de1587036c1593e89591c1b3a2556060bcd668cfce5bb6a7197f850fb1b4c7a7aa6c
Type fulltextMimetype application/pdf

Other links

preview image

Authority records

Ramirez Villegas, Ricardo

Search in DiVA

By author/editor
Ramirez Villegas, Ricardo
By organisation
Energy Technology
Energy SystemsEnvironmental Analysis and Construction Information Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 363 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 1719 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf