UNDERSÖKNING AV ENERGIFÖRBRUKNING I ETT FLERBOSTADSPASSIVHUS : En fallstudie på ETC hyreshus i Västerås

Purpose: The purpose of this work is with the help of a case study object called “ETC apartment houses”, make a comparison of possible energy related savings that can be achieved by building apartment buildings far better than the requirements set in BBR. The idea is that this should give a clear picture for entrepreneurs and property managers to promote energy-efficient building in the society. Method: In the study, three building categories were looked at to make a significant comparison of how energy use varies between different buildings. What has been compared are the requirements in BBR and ETC´s apartment houses, which is an ongoing case study object that is being built according to FEBY Gold's criteria. Finally, this has been compared to Mimer Bostads AB´s “Mesanseglet” which a reference object that has been built according to the requirements in Miljöbyggnad silver. Data has been collected from authorities, public documents and through personal communication with a contact person at the company that runs the case study object. Results: The results show that the differences between the three categories are large, for both climate impact and energy costs for building electricity. It is possible to reduce the values by almost 80 percent, a comparison of the requirements in BBR with ETC´s apartment houses show. In a comparison with the reference object, the reduction has been presented at between 30 and 40 percent. A major reason why the case study object achieves this figure is due to the use of solar panels, which, after its estimated payback time of about 10 years, manages to fill large parts of the building's energy needs at a low cost. Conclusions: The work shows that large savings can be achieved without the need for building costs necessarily being higher. It is also important to point out that the focus for energy efficient building should be low energy consumption and not high local energy production. In order to achieve what is required, a certification can in some cases work as motivation for the contractor by adding increased value, although it might be considered unnecessary for the case study object as the company that builds the houses will also own them