Optimization of emission reducing energy retrofits in Finnish apartment buildings

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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 Conference, 26th-29th May, 2019, Bucharest, Romania
Number of pages6
Publication statusPublished - 2019
MoE publication typeA4 Article in a conference publication
EventREHVA World Congress - Bucharest, Romania
Duration: 26 May 201929 May 2019
Conference number: 13

Publication series

NameE3S web of conferences
PublisherEDP Sciences
ISSN (Print)2555-0403
ISSN (Electronic)2267-1242


ConferenceREHVA World Congress
Abbreviated titleCLIMA

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