Residential energy renovation: Analysis of energy savings and economic profitability in a multifamily building block
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Typ
Examensarbete för masterexamen
Program
Publicerad
2021
Författare
Arvidsson, Daniel
Lama, Gaurab
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
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.
Beskrivning
Ämne/nyckelord
energy-efficiency , energy auditing , energy simulations , renovation , economic analysis , EAC , FVP , FTX , CO2 emissions