Värmeförluster i ett prefabricerat småhus och dess inverkan på husets energiklass

In Sweden, the housing sector accounts for about 40% of the country's energy consumption. Theself-contained houses account for about 20% of this energy consumption (Energimyndigheten,2021). Boverket is the authority in Sweden that regulates the laws and regulations that affectenergy use (Boverket, 2016). In addition to Boverkets regulations, there are external organizationsthat drive development to minimize households' energy use (Feby, 2019). One of theseorganizations is FEBY, they have designed requirements that can be used as a complement to theBBR requirements. The organization has developed the parameter heat loss rate, which calculatesthe buildings heat loss.This study has been carried out in collaboration with the house manufacturer Jörnträhus AB. Thegoal of the work has been to develop a house that meets FEBY 18's requirements for heat loss rateand then verify the house's performance against Boverkets energy classification. The study wasbased on a reference house provided by Jörnträhus. The house was modeled in the energy programVIP-Energy and then analyzed. After the analysis, it was found that the reference house's VFTreaches 58.15 W / m2Atemp. Thereafter, the house was remodeled in VIP-Energy with changes tothe constructions and the ventilation system. With these changes, the VFT was calculated at 27.49W / m2Atemp and achieves the bronze level for FEBY 18.Finally, four simulations were performed to check the primary energy of the house during differentscenarios. All simulations were carried out in Skellefteå municipality but with different conditions.Two of the simulations were carried out at a location with open space and the other two simulationswere performed at a enclosed location with much shadow. In the different scenarios, the heatingand ventilation systems were varied. The simulations showed that wind and solar heat loads canhave a greater impact on primary energy than some technical solutions like heat recovery in theventilation.