Measured performance of exhaust air heat pumps in Finnish apartment buildings

Petri Pylsy*, Jarek Kurnitski

*Corresponding author for this work

Research output: Contribution to journalConference articleScientificpeer-review

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The energy efficiency of existing apartment buildings is playing an important role in energy and climate targets. In Finland, mechanical exhaust ventilation system is commonly used in older apartment buildings. Hence, there could be an energy saving potential by an exhaust air heat pump system (EAHP). In this work two cases have been studied. Buildings were built in 1960's and 1970's and in renovation equipped with hybrid heating system: district heating and exhaust air heat pump system. Two years measurement data, 2018 and 2019, was collected to evaluate the performance of exhaust air heat pump systems. According to measurement data the monthly coefficient of performance (COP) was calculated as well as seasonal coefficient of performance (SCOP) was defined. The monthly COP values varied from 3,1 to 4,6 and SCOP values were about 3,7. Heating energy cost savings were 23-31 %. Energy performance class before and after EAHP installation was calculated. If at least 50 % of heating energy consumption was covered by EAHP then also energy performance class was improved.

Original languageEnglish
Article number06001
Number of pages7
JournalE3S Web of Conferences
Publication statusPublished - 29 Mar 2021
MoE publication typeA4 Article in a conference publication
EventInternational Cold Climate HVAC Conference - Tallinn, Estonia
Duration: 18 Apr 202121 Apr 2021


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