Avvikelser mellan beräknad och faktisk energianvändning i byggnader: Fallstudie av en fastighet byggd 2012
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
The Swedish legislation for energy efficiency in buildings established in 2006 presents maximum limits for annual energy use in new buildings. To fulfill these goals the property developer is required to perform an energy calculation beforehand. The regulations also include an independent follow-up of energy use within two years after commissioning of the building. Significant discrepancies between calculated and actual results appear and need to be reduced. In this case study the energy consumption inoperation has been compared to the energy simulations in VIP Energy from the planning phase for a property consisting of four apartment buildings located in Uppsala, Sweden. The property uses a combination of geothermal heating and district heating. A wide approach to identify possible causes was applied, ranging from review of input parameters in the simulation files to evaluation of impact from deviating operation parameters and residential behavior. Furthermore, the thesis highlights the possible impact of the working process with energy calculations and follow-up of energy use in operation. The process was compared to a Swedish industry standard called Sveby, which defines a work plan for energy management in building projects.
In the case study the energy use in operation exceeds the simulated results with approximately 63 % for two of the buildings and 44 % for the remaining two. The property uses more district heating than predicted. Possible causes have been identified, for example poor functioning of the heat pump and excluded heat losses in the simulation, but more detailed onsite measuring is needed to confirm the causes. An industry wide systematic approach to extend the monitoring of energy usage inoperation may reduce the deviations in future projects.
Place, publisher, year, edition, pages
2015. , 71 p.
UPTEC ES, ISSN 1650-8300 ; 15044
energianvändning, energiberäkning, byggnad, avvikelse, Sveby, BBR, Boverket
Energy Systems Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-296268OAI: oai:DiVA.org:uu-296268DiVA: diva2:937053
Master Programme in Energy Systems Engineering
Jönsson, Petra, ForskareRoos, Arne, Professor emeritus