Finnish energy renovation subsidies in multifamily apartment buildings : Lessons learnt and best practices
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2024-03-15
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Language
en
Pages
16
Series
Energy and Buildings, Volume 307
Abstract
This study analysed renovation measures implemented with ARA renovation subsidy in Finland in multifamily apartment buildings. Measured energy data was used to calibrate the energy simulation model of the most typical renovated building from the 1970 s. For the reference building, a comprehensive set of renovation packages were applied to assess the performance of ARA grants. It was noticed that official energy performance certificates (EPC) overestimated before the renovation energy use as well as energy saving by a factor of almost 2. It was notable that in calculated EPCs, after renovation, EP-value was higher than before renovation, EP-value based on measured energy use. The main reasons for faulty energy calculations were strong overestimations in the building leakage rate and ventilation airflow rate. Renovation packages reduced EP-value by 8 % to 27 %, including lighting and appliances. Those using district heat resulted in a small increase in electricity with a flat duration curve, but the combined ground source and exhaust air heat pump showed the highest peak electricity power increase by factor 6. Exhaust air heat pump, window replacement and photovoltaic were the most cost-effective options, while packages with additional insulation faced considerably higher costs than the sum of ARA support and monthly savings could cover bank loans; thus, ARA support was clearly too small to support deep renovation. The need to improve the accuracy of EPCs in assessing energy performance to facilitate more effective financial support was a finding that can be important for any support scheme to secure the necessary funding for renovation.Description
Funding Information: This research was supported by the Academy of Finland (grant for DECARBON-HOME 335253 and grant for FlexiB 333365 ) and by the Estonian Centre of Excellence in Energy Efficiency, ENER (grant TK230) funded by the Estonian Ministry of Education and Research. The authors are grateful to ARA, The Housing Finance and Development Centre of Finland, for sharing the subsidies data for this research. Funding Information: This research was supported by the Academy of Finland (grant for DECARBON-HOME 335253 and grant for FlexiB 333365) and by the Estonian Centre of Excellence in Energy Efficiency, ENER (grant TK230) funded by the Estonian Ministry of Education and Research. The authors are grateful to ARA, The Housing Finance and Development Centre of Finland, for sharing the subsidies data for this research. Publisher Copyright: © 2024 The Author(s)
Keywords
ARA renovation subsidies, Deep renovation, Energy Performance Certificate, Energy renovation
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Citation
Hajian, H, Pylsy, P, Simson, R, Ahmed, K, Sankelo, P, Mikola, A & Kurnitski, J 2024, ' Finnish energy renovation subsidies in multifamily apartment buildings : Lessons learnt and best practices ', Energy and Buildings, vol. 307, 113986 . https://doi.org/10.1016/j.enbuild.2024.113986