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An approach to illustrate strategies for improved energy efficiency at the municipal level
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system. Högskolan Dalarna, Energiteknik.ORCID iD: 0000-0002-9789-3882
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Environmental engineering. Högskolan Dalarna, Energiteknik.ORCID iD: 0000-0003-2868-6481
Högskolan Dalarna, Energiteknik.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Environmental engineering.ORCID iD: 0000-0002-5661-2917
2014 (English)In: Proceedings from the 14th International Symposium on District Heating and Cooling / [ed] Anna Land, Swedish District Heating Association, 2014, p. 50-55Conference paper, Published 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.

Place, publisher, year, edition, pages
2014. p. 50-55
Keywords [en]
Energy Efficiency, District Heating, Decision making, Million programme
National Category
Energy Engineering
Research subject
Energy, Forests and Built Environments, Reesbe företagsforskarskola
Identifiers
URN: urn:nbn:se:hig:diva-23991ISBN: 978-91-85775-24-8 (electronic)OAI: oai:DiVA.org:hig-23991DiVA, id: diva2:1093520
Conference
14th International Symposium on District Heating and Cooling (DCH14), 6-10 September 2014, Stockholm, Sweden
Projects
REESBE
Funder
Knowledge FoundationAvailable from: 2017-05-08 Created: 2017-05-08 Last updated: 2018-04-25Bibliographically approved
In thesis
1. A methodology to assess impacts of energy efficient renovation: a Swedish case study
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
2. Influences from Building Energy Efficiency Refurbishment on a Regional District Heating System
Open this publication in new window or tab >>Influences from Building Energy Efficiency Refurbishment on a Regional District Heating System
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Improving energy performance of existing buildings is an important part in decreasing energy use and in turn reduce the greenhouse gas emissions caused by human activity and the primary energy use.

To be able to evaluate how energy refurbishment influences the greenhouse gas emissions and the primary energy use a wider system perspective is needed that puts the building in its context. This thesis deals with energy refurbishment packages performed on multi-family buildings within district heated areas and how they influence greenhouse gas emissions and primary energy use when the district heating use is altered.

A simulated building is used to evaluate several energy refurbishment packages. The results are used as input data for models of district heating systems to cost optimize the district heating production. The results from the cost optimization are used to evaluate the impact on greenhouse gas emissions and primary energy use.

The results show a difference between measures that saves district heating without increasing the use of electricity and measures that increases the use of electricity while district heating is saved. For example, a building refurbishment package including only building envelope improvements saves the same amount of district heating as a package including only mechanical ventilation with heat recovery. Despite this, the emissions of greenhouse gases and the use of primary energy is to a greater extent reduced in the first package because the use of electricity remains unchanged.

Comparing energy refurbishment packages performed on the same building, but within different district heating systems, show the importance of the design of the district heating system. Depending on the fuel types used and to which extent electricity is co-produced in the district heating system, the results of implementing the energy refurbishment packages vary. The largest reduction of greenhouse gases and primary energy use occurs when a refurbishment package is performed on a building in a district heating system with high share of biofuel and no electricity production.

Abstract [sv]

Att förbättra energiprestanda hos befintliga byggnader är en viktig del i arbetet med att minska energianvändningen och i sin tur minska utsläpp av växthusgaser orsakade av mänsklig aktivitet samt att minska användningen av primärenergi.

För att kunna utvärdera hur energieffektivisering av byggnader påverkar växthusgasutsläpp och primärenergianvändning behövs ett brett systemperspektiv som sätter byggnaden i sitt sammanhang. Denna avhandling handlar om hur paket av energieffektiviseringsåtgärder som utförs på flerfamiljshus inom fjärrvärmeuppvärmda områden påverkar växthusgasutsläpp och primärenergianvändning när fjärrvärmeanvändningen förändras.

Resultaten visar på skillnader mellan åtgärder som sparar fjärrvärme utan att öka användningen av el och åtgärder som ökar användningen av el medan fjärrvärme sparas. Till exempel sparar ett energieffektiviseringspaket som endast omfattar byggnadsskalsförbättringar samma mängd fjärrvärme som ett paket som endast omfattar installation av mekanisk ventilation med värmeåtervinning. Trots detta minskar utsläppen av växthusgaser och användningen av primärenergi i större utsträckning i det första paketet på grund av att elanvändningen förblir oförändrad.

Vikten av fjärrvärmesystemets utformning visas då en byggnad där olika energieffektiviseringspaket testats, flyttas runt till olika fjärrvärmesystem. Beroende på vilka bränsletyper som används och i vilken utsträckning som el produceras i fjärrvärmesystemet så varierar resultaten. Den största minskningen av växthusgaser uppstår när ett renoveringspaket utförs på en byggnad i ett fjärrvärmesystem med hög andel biobränsle och ingen elproduktion.

Place, publisher, year, edition, pages
Gävle: Gävle University Press, 2018. p. 27
Series
Studies in the Research Profile Built Environment. Licentiate thesis ; 4
Keywords
District heating, energy efficiency, building refurbishment, greenhouse gases, primary energy, Fjärrvärme, energieffektivitet, byggnadsrenovering, växthusgaser, primärenergi
National Category
Energy Systems
Identifiers
urn:nbn:se:hig:diva-26499 (URN)978-91-88145-26-0 (ISBN)978-91-88145-27-7 (ISBN)
Presentation
2018-06-05, B322, Högskolan Dalarna, Borlänge, 11:00 (Swedish)
Opponent
Supervisors
Funder
Knowledge Foundation
Available from: 2018-06-05 Created: 2018-04-25 Last updated: 2018-06-05Bibliographically approved

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Lidberg, TinaRamírez Villegas, RicardoEriksson, Ola

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