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A methodology to assess impacts of energy efficient renovation: a Swedish case study
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system. Dalarna University. (REESBE)
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. , 22 p.
Series
Studies in the Research Profile Built Environment. Licentiate thesis, 3
Keyword [en]
Buildings, renovation, greenhouse gases emissions, district heating, energy efficiency, building environmental assessment tools, energy use, heating
Keyword [sv]
Byggnader, renovering, växthusgasutsläpp, fjärrvärme, energieffektivisering, byggnadsmiljöprestanda verktyg, energianvändning, värme
National Category
Environmental Analysis and Construction Information Technology
Identifiers
URN: urn:nbn:se:hig:diva-23953ISBN: 978-91-88145-13-0 (print)ISBN: 978-91-88145-14-7 (electronic)OAI: oai:DiVA.org:hig-23953DiVA: diva2:1092206
Opponent
Supervisors
Projects
REESBE
Funder
Knowledge Foundation
Available from: 2017-05-08 Created: 2017-05-02 Last updated: 2017-05-23Bibliographically 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 / [ed] Anna Land, Swedish District Heating Association, 2014, 50-55 p.Conference paper (Refereed)
Abstract [en]

This work focuses on how implementation of wellknown refurbishment strategies, applied on multifamily buildings in a post-war housing complex in Sweden can affect the generation of district heating. Both the energy use and the power load were considered.

The study was performed in Borlänge municipality, Sweden, where the municipality owns both the energy and the housing companies. The strategies for energy efficiency were simulated with IDA-ICE for the Tjärna Ängar area, a housing complex built between 1969- 1971, with access to documented information about the buildings and energy audit. The results of the building simulation were implemented in a simplified model of the local district heating system.

The results indicate how different renovation strategies affect the demand of energy and power load within the district heating system and can be used to provide indicators for different scenarios. The larger goal of the research is how to maximize the economic and environmental efficiency of improvement strategies on a municipal level as well as how to find appropriate energy optimization methods that can be proposed by building contractors. The initial study presented here was conducted within the research program Reesbe.

Keyword
Energy Efficiency, District Heating, Decision making, Million programme
National Category
Energy Engineering
Research subject
Energy, Forests and Built Environments, Reesbe företagsforskarskola
Identifiers
urn:nbn:se:hig:diva-23991 (URN)978-91-85775-24-8 (ISBN)
Conference
14th International Symposium on District Heating and Cooling (DCH14), 6-10 September 2014, Stockholm, Sweden
Projects
REESBE
Funder
Knowledge Foundation
Available from: 2017-05-08 Created: 2017-05-08 Last updated: 2017-05-08Bibliographically 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, 26-33 p.Article 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.

Keyword
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 (ScopusID)
Funder
Knowledge Foundation
Available from: 2016-01-11 Created: 2016-01-11 Last updated: 2017-05-08Bibliographically approved

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