Energy Performance of a Renovated Multi-Family Building in Sweden
Increased attention is being directed towards reducing energy use in buildings, and implementing energy-saving measures when renovating buildings has become of central importance. The aim of this chapter is to study the effects on heat demand of a deep renovation of a Swedish post-war, multi-family building. The studied building was renovated in 2014, and the renovation measures included thermal improvement of the climate envelope and installation of a mechanical supply and exhaust air ventilation system with heat recovery. The effect on heat demand is studied through a whole-building energy simulation, using IDA Indoor Climate and Energy. The IDA model is empirically validated with regard to its ability to predict indoor temperature and energy use. The results indicate a technical potential for a 50.3 % reduction of heat demand from implemented renovation measures, but measured data indicate that actual energy use is around 15 % higher than the technical potential. The reasons for this gap could be overestimated heat recovery efficiency or airing.
This study was funded by the Swedish Research Council Formas. The authors are grateful to the property owner and occupants for granting access to the building and reference apartments.
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