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Implications of energy efficiency renovation measures for a Swedish residential building on cost, primary energy use and carbon dioxide emission
Linnaeus University, Faculty of Technology, Department of Building and Energy Technology. (SBER)
Linnaeus University, Faculty of Technology, Department of Building and Energy Technology. (SBER)
Linnaeus University, Faculty of Technology, Department of Building and Energy Technology. (SBER)
2013 (English)In: ECEEE Summer Study proceedings: rethink, renew, restart, European Council for an Energy Efficient Economy (ECEEE), 2013, p. 1287-1296Conference paper, Published paper (Refereed)
Abstract [en]

Building sector accounts for 40% of total primary energy use in the EU. Measures to improve energy efficiency in existing buildings may reduce primary energy use and carbon dioxide (CO2) emission. In this study, we analysed the potential final energy savings for space heating and cost-effectiveness of different energy efficiency measures for a Swedish multi-story residential building from building owner perspective. The implications of the measures on primary energy use and CO2 emission were also explored. Building envelope elements were considered as energy efficiency measures. Required investment for energy efficiency measures per saved energy price was used as indication for the cost-effectiveness of energy renovation. We analysed three scenarios of energy renovation where the building is in its initial state, once with and then without renovation need for repair and maintenance purpose and the scenario for the current state of building. The current state of the building has some modification compared to the initial state. We performed sensitivity analysis to study the influence of economic parameters on the cost-effectiveness of energy efficiency measures. The results showed that the energy savings and cost-effectiveness of the measures depend on building characteristics, energy efficiency measures and the assumed economic parameters. Modelling of final energy use, before and after energy renovation, and its cost analysis showed that the considered energy efficiency measures were not economically profitable with the initial economic assumption (6% discount rate and 1.9% annual energy price increase during 50-year lifespan). For the renovation package of all energy efficiency measures, energy renovation appeared to be profitable when discount rate and annual energy price increase were 3% and 2.5% (or larger), respectively. Primary energy use and CO2 emission were reduced by 45 to 50% for the same package for the building with cogeneration-based district heating.

Place, publisher, year, edition, pages
European Council for an Energy Efficient Economy (ECEEE), 2013. p. 1287-1296
Series
eceee Summer Study, ISSN 1653-7025
Keywords [en]
building envelope, energy efficiency measures, cost effectiveness, building retrofitting, CO2 emissions, primary energy
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:lnu:diva-24877ISBN: 978-91-980482-2-3 (print)OAI: oai:DiVA.org:lnu-24877DiVA, id: diva2:612622
Conference
ECEEE 2013, Belambra Les Criques, France, June 3-8, 2013
Available from: 2013-03-22 Created: 2013-03-22 Last updated: 2018-09-28Bibliographically approved
In thesis
1. Cost-optimality approach for prioritisation of buildings envelope energy renovation: A techno-economic perspective
Open this publication in new window or tab >>Cost-optimality approach for prioritisation of buildings envelope energy renovation: A techno-economic perspective
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The existing residential buildings in the European countries are rather old and often fail to meet the current energy performance criteria. In Sweden, about 45% of the existing residential buildings have been constructed before 1960. Considering the significant contribution of existing buildings to Greenhouse Gas emissions, improving buildings energy performance could considerably help to achieve the national targets. Sweden’s fourth national action plan calls for 45% reduction in final energy use for heating of buildings by 2050, compared to 1995. Deep energy renovation of buildings envelope would significantly contribute to heat demand reduction. However, it is often subject to complex challenges from economic perspectives.

In this thesis, the cost-effectiveness and cost-optimality of building energy renovation have been studied in order to provide knowledge on where to start building renovation, in which order and to what extent. It aims at suggesting cost-effective approaches for prioritising the implementation of energy renovation measures in residential buildings, considering different techno- economic scenarios. An extensive building energy simulation work and analytical analysis were performed on a multi-family building and single- family houses.

The findings suggest how to prioritise the energy renovation of different envelope components in buildings located in different outdoor climates from energy saving and cost-effective perspectives. The findings indicate that the energy renovation of older buildings in northern climate zones are more cost- effective, compared to less old buildings in southern zones, when renovated to a cost-optimal level. The older buildings offer more energy saving when renovated to a cost-optimal level, compared to less old buildings or those in southern zones. The contribution of climate zones to the cost-effectiveness of energy renovation varies significantly in different components, depending on their level of exposure to outdoor climate.

An optimisation exercise was done in order to maximise energy saving by renovation of building envelope components under budget constraint condition. The enumerative algorithm of Brute-force was employed for this optimisation problem. The results suggest optimum renovation packages which could offer as much energy saving as a limited budget allows. It helps to develop a forward-thinking perspective that would guide individuals and financial institutions in their investment plans and incentives allocation policy.

Place, publisher, year, edition, pages
Växjö: Linnaeus University Press, 2018. p. 90
Series
Linnaeus University Dissertations ; 311
Keywords
Building renovation, Energy efficiency, Cost-optimality, costeffectiveness, Building envelope, Residential buildings, Building energy simulation, Brute-force algorithm
National Category
Civil Engineering Building Technologies Environmental Engineering
Research subject
Technology (byts ev till Engineering), Sustainable Built Environment
Identifiers
urn:nbn:se:lnu:diva-78059 (URN)978-91-88761-33-0 (ISBN)978-91-88761-34-7 (ISBN)
Public defence
2018-03-08, Södrasalen, Hus M, Växjö, 12:00
Opponent
Supervisors
Available from: 2018-09-28 Created: 2018-09-27 Last updated: 2018-09-28Bibliographically approved

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Bonakdar, FarshidGustavsson, LeifDodoo, Ambrose

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Citation style
  • apa
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  • ieee
  • modern-language-association-8th-edition
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Output format
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