Abstract
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.
Highlights
The European Commission has proposed that greenhouse emissions should be reduced at least by 55 % by 2030 in EU [1]
This paper evaluated the performance of exhaust air heat pump system in Nordic climate
The evaluation was based on the measurement data of two cases and monthly coefficient of performance (COP) and seasonal coefficient of performance (SCOP) was calculated
Summary
The European Commission has proposed that greenhouse emissions should be reduced at least by 55 % by 2030 in EU [1]. The existing target was 40 % [1]. Some national carbon neutrality targets have been set. In Finland the goal of carbon neutrality should be pursued by 2035 [2]. According to the revised energy performance of buildings directive Member States had to create a long-term renovation strategy to decarbonise the building stock by 2050 [3]. EU commission launched ‘Renovation wave’ strategy in 2020 [4]. In this strategy one key principle is ‘energy efficiency first’ and e.g. the possibility of mandatory minimum energy performance standards for existing buildings was mentioned [4]. It is possible that an Energy Performance Certificate and an energy performance class could be more important for building owners in the future
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