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The Implications of Climate Zones on the Cost-Optimal Level and Cost-Effectiveness of Building Envelope Energy Renovation and Space Heat Demand Reduction
Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology. (SBER)
Chalmers University of Technology.
Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology. (SBER)ORCID iD: 0000-0003-4405-1056
2017 (English)In: Buildings, ISSN 2075-5309, E-ISSN 2075-5309, Vol. 7, no 2, article id 39Article in journal (Refereed) Published
Abstract [en]

The cost-optimal level of energy performance for buildings shall be identified according to the European directive of 2010. The Swedish building stock needs comprehensive knowledge and an overall strategy for the cost-optimal level of renovation. This paper studies the contribution of Swedish climate zones to the cost-optimal level of renovation on a multi-story residential building in Sweden from the building owner perspective. The building space heat demand is simulated for four Swedish climate zones. The net present profit (NPP) method is defined and used in this study in order to analyze the cost-optimal level and the cost-effective renovation of building envelope components (e.g., attic floor, basement walls, exterior walls and windows). The implication of different discount rates is studied, as well. The results show that the optimum renovation of the building envelope offers 51% more energy savings for space heating when the building is in a northern climate zone compared to a southern zone. The study suggests that different renovation strategies for the building stock renovation need to be identified, separately, for each climate zone. The NPP analysis identifies the minimum required investment and maximum achievable energy savings that are needed to have a cost-effective renovation. The broad range of studied climate zones provides the opportunity to apply the obtained results to other climate zones by either interpolation or extrapolation of NPPs for the buildings with similar characteristics.

Place, publisher, year, edition, pages
2017. Vol. 7, no 2, article id 39
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Sustainable Built Environment
Identifiers
URN: urn:nbn:se:lnu:diva-65751DOI: 10.3390/buildings7020039ISI: 000404438700013OAI: oai:DiVA.org:lnu-65751DiVA, id: diva2:1113981
Available from: 2017-06-22 Created: 2017-06-22 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, FarshidMahapatra, Krushna

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