Optimization of emission reducing energy retrofits in Finnish apartment buildings

Janne Hirvonen, Juha Jokisalo, Juhani Heljo, Risto Kosonen

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

    3 Citations (Scopus)


    This study examined the cost-optimality of energy renovation on Finnish apartment buildings of different ages, built according to different energy performance requirements. Multi-objective optimization was utilized to minimize both CO2 emissions and life cycle cost (LCC). IDA-ICE simulations were performed to obtain the hourly heating demand of the buildings. Four building age classes and three heating systems (district heating, exhaust air heat pump and ground-source heat pump) were separately optimized. With district heating, it was possible to reduce emissions by 11%, while also reducing LCC. With heat pumps cost-savings could be achieved while reducing emissions by over 49%. With maximal (not cost-effective) investments, emissions could be reduced by more than 70% in all examined cases. In all cases, the cheapest solutions included solar electricity and sewage heat recovery. In old buildings, window upgrades and additional roof insulation were cost-effective. In new buildings, demand-based ventilation was included in all optimal solutions.

    Original languageEnglish
    Title of host publicationCLIMA 2019 Congress
    Subtitle of host publicationBucharest, Romania, May 26-29, 2019
    PublisherEDP Sciences
    Publication statusPublished - 13 Aug 2019
    Publication typeA4 Article in a conference publication
    EventREHVA World Congress - Bucharest, Romania
    Duration: 26 May 201929 May 2019

    Publication series

    NameE3S Web of Conferences
    ISSN (Print)2555-0403


    ConferenceREHVA World Congress

    Publication forum classification

    • Publication forum level 1

    ASJC Scopus subject areas

    • Environmental Science(all)
    • Energy(all)
    • Earth and Planetary Sciences(all)

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