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Investigating cost-optimal energy renovation of a multifamily building in Sweden
Linköpings universitet.
Linköpings universitet.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology. Linköpings universitet.ORCID iD: 0000-0003-3472-4210
2019 (English)In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 203, article id 109438Article in journal (Refereed) Published
Abstract [en]

A significant reduction in energy use in the building stock is a major challenge for the future, and doing this in a cost-effective manner is important. This study uses an optimization approach to identify life cycle cost (LCC) optimal energy efficiency measures (EEMs) to implement as part of a renovation of a multifamily building in Sweden. The studied building is a multifamily building with a lightweight concrete construction and an exhaust air ventilation system, built in 1961. The optimization tool OPERA-MILP is used. The energy renovation approaches are compared to both the performed energy renovation of the building and a validated dynamic energy simulation model in IDA ICE 4.8. The results show that under the given framework conditions and assumptions it is not cost-optimal to improve the thermal performance of the building envelope or to implement heat recovery ventilation measures to reduce the space heating demand in the building when considering a life cycle of 40 years. Balanced mechanical ventilation system with heat recovery is cost-effective when an energy saving target of 40% is introduced. The energy renovation of the building has a slightly higher LCC than the cost-optimal level, and it would have been more cost-effective to add more insulation to the façade instead of the attic to achieve the same level of energy saving. A sensitivity analysis has been performed to reveal the effect of the discount rate, energy price, cost of EEMs, thermal properties of the building envelope and windows’ solar heat gain factors on the LCC.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 203, article id 109438
Keywords [en]
Renovation, LCC, Optimization, Building energy simulation, Multifamily building, Energy use, OPERA-MILP, IDA ICE
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:hig:diva-30832DOI: 10.1016/j.enbuild.2019.109438ISI: 000496335500024Scopus ID: 2-s2.0-85067232489OAI: oai:DiVA.org:hig-30832DiVA, id: diva2:1365150
Available from: 2019-10-23 Created: 2019-10-23 Last updated: 2019-11-28Bibliographically approved

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Moshfegh, Bahram

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CiteExportLink to record
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Citation style
  • apa
  • harvard-cite-them-right
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Language
  • sv-SE
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Output format
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