Abstract
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.
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Notes
- 1.
Calculated \( {Q}_{\mathrm{t}}={\displaystyle \sum U\cdot A} \), where Qt is the total transmission losses (W/°C), U the overall heat transfer coefficient (W/m2,°C) and A the area (m2).
- 2.
Calculated \( {Q}_{\mathrm{v}}=\overset{.}{m}\cdot {C}_{\mathrm{p}} \), where \( \overset{.}{m} \) is the ventilation mass flow (kg/s) and Cp the specific heat capacity of air (J/kg, °C).
- 3.
Calculated \( {Q}_{\mathrm{v}}=\left(1-\eta \right)\cdot {\overset{.}{m}}_{\mathrm{exaust}}\cdot {C}_{\mathrm{p}} \), where η is the heat recovery efficiency, \( {\overset{.}{m}}_{\mathrm{exhaust}} \) the exhaust ventilation mass flow (kg/s) and Cp specific heat capacity of air (J/kg,°C).
- 4.
The Sveby programme is a Swedish national development programme for understanding building energy performance (http://www.sveby.org/om-sveby/).
- 5.
STRÅNG is a mesoscale model for solar radiation developed by SMHI (the model can be accessed at http://strang.smhi.se/).
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Acknowledgement
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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La Fleur, L., Moshfegh, B., Rohdin, P. (2017). Energy Performance of a Renovated Multi-Family Building in Sweden. In: Sayigh, A. (eds) Mediterranean Green Buildings & Renewable Energy. Springer, Cham. https://doi.org/10.1007/978-3-319-30746-6_39
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