Nollenergihus i Borlänge
Är det möjligt med biomassa, solenergi och vindkraft?
This report is of technical character and treats how to plan a small building in Borlänge, Sweden.The technical components that have been treated in the report are the construction, foundation,installations and thermic abilities of the house. In addition to planning this house the report alsocontains a part that deepens in net zero energy buildings. The purpose of the report is toinvestigate if the house in Borlänge can be constructed to meet net zero energy buildingdemands.Energy efficient houses such as passive- and net zero energy houses are showing more frequenton the market in Sweden. Ongoing climate changes and growing consciousness about theenvironment in society have contributed to that the environment is a well discussed topic. Toconsume small amounts of energy and at the same time produce local energy is thereforesomething that lies in the future and future houses. Production of local and environmentalfriendly energy is a great challenge and demands significant knowledge. In this report we haveaimed the focus on environmental friendly sources of energy such as sun energy, wind power andbiomass of pellets. Based on knowledge from our earlier studies within our programme we haveinvestigated the possibility of planning a net zero house in Borlänge.It turns out to be difficult to plan a net zero energy house in Borlänge. The research shows thatthe planned house does not pass the demands for a passive house and therefore it does not passthe net zero energy demand either. The planned house has a high shape factor which indicatesthat a significant amount of internal heat passes through the climate shell. To meet the passivehouse demands we would have to give the house a different shape to obtain a lower shape factorwhich would increase the ability of the house to keep internal heat. Because of the fact thatBorlänge is situated in climate zone II in Sweden it needs heating during main part of the year. Inaddition to this there are few hours of sun during the winter and the conditions to create energyfrom wind power are relatively poor. Due to this it is difficult to produce more energy than thehouse will consume.