Residential energy renovation: Analysis of energy savings and economic profitability in a multifamily building block

Examensarbete för masterexamen
Arvidsson, Daniel
Lama, Gaurab
The necessity for renovation of the Swedish Million Homes Programme building stock has been under scrutiny in recent years. Many of these buildings are undergoing deterioration and have an energy performance far below the current standard for new buildings (Högberg et al., 2009). In Sweden, up to 40% of the energy usage originates from the building sector (Liu et al., 2014) and less than 1% of buildings are newly added to the building stock each year (Economidou M et al., 2011). Thus, to reduce this energy use, the energy-efficiency of the existing buildings has to be improved via renovation. This strategy is also part of the European Union’s Green deal announced in 2019, the policies of which its member states are expected to comply (European Union, 2019). This thesis aimed to formulate several renovation packages to achieve an annual specific energy use reduction of at least 30%. Six multi-family buildings from the Million Homes Programme located in Hisings Backa, Gothenburg were investigated as part of the study. One building was selected as the case study building and simulated in IDA ICE to replicate its current energy performance. The proposed renovation measures dealt with improving the building envelope, ventilation system and some minimal baseline measures. These measures were put together into several different packages and simulated to determine the post-renovation energy savings and operational CO2 reductions. In addition, economic evaluations were conducted using the Equivalent Annual Cost (EAC) method to gauge the most economically sound package. Finally, the results obtained from the case study building were extrapolated to the five other buildings connected to the same substation. The thesis concluded that savings in specific energy use of more than 50% could be achieved by upgrading the existing F-ventilation to an FTX or FVP system. The thesis also established that it is generally challenging to make a renovation project profitable solely based on operational energy cost reductions. However, a few packages with reasonable savings were found to have a comparatively good EAC, which could potentially mean that they are profitable.
energy-efficiency , energy auditing , energy simulations , renovation , economic analysis , EAC , FVP , FTX , CO2 emissions
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