Assessing the Myths on Energy Efficiency When Retrofitting Multifamily Buildings in a Northern Region
Jan Akander, Mathias Cehlin, and Bahram Moshfegh
In light of EU’s requirements on achieving major cuts in energy use by 2050, Sweden has similar targets. The built environment must by 2020 reduce energy use by 20 and 50 % by 2050. While the size of the future building stock will increase— and independently of how energy efficient each future new building will be—the energy performance of the old stock must be improved in order to reach those goals. Buildings in Sweden consume almost 39 % of all demand side energy, of which most is for space and domestic hot water (DHW) heating (SEA 2013). The building sector has the best potential to reduce energy use by 50 % in 2050 compared to the energy use during 1995 (Boverket 2007). A step in that direction is to diminish energy use by 20 % in 2020 and that 50 % of all energy should come from renewable sources. The latter goal was achieved in 2012 at 51 % (Eurostat 2014), but the former goal is more difficult to reach. In four major renovation projects in Sweden that involved retrofitting of multifamily building blocks in large cities, more than 50 % reduction was achieved and in two of the cases, the energy conservation measures (EMCs) were considered profitable (Byman and Jernelius 2012).
J. Akander (*) • M. Cehlin
© Springer International Publishing Switzerland 2017 A. Sayigh (ed.), Sustainable High Rise Buildings in Urban Zones, DOI 10.1007/978-3-319-17756-4_8
CO2-eq emissions from the building stock are relatively low. On a national basis, electricity is mainly produced by hydro (48 %), nuclear (38 %) and wind power (4 %) and the remaining 10 % is combustion-based production (SEA 2013). Buildings account for lower than 15 % of Sweden’s CO2-eq emissions.