Energikartläggning av förskola : Underlag för energieffektiviseringsåtgärder av byggnaden Metreven samt fördjupning avseende potential för uppfyllande av Boverkets krav gällande nära- nollenergibyggnad

The Swedish residential sector consumes almost 39 % of Sweden’s final energy consumption. The European Union framework ”Clean Energy for all Europeans package” strives to promote a 32,5 % reduction as a result of energy efficiency measures. The Swedish legislation BBR regulates rules regarding new buildings, extensions and reconstruction of existing buildings. Excerpt 9 regards how energy is being used and determines the demands e.g. for a buildings primary energy use to be classified as a near zero energy building (NZEB). The energy use of a building, located in Västerås, Sweden, is being decided. Various energy efficiency packages are applied to a model in the simulation software IDA ICE. The results are compared with each other deciding the potential benefits of the energy efficiency measures. A substantial decrease of the energy consumption is detected, especially for the energy efficiency packages containing a geothermal heat pump (66 – 78 %). A life cycle cost analysis shows that the package containing a ventilation heat recovery system (FTX) combined with a geothermal heat pump is the optimal solution through an economical point a view. The solution yields a profit after 14 years. The analysis shows that all geothermal solutions, except a system consisting of a geothermal heat pump, FTX, energy efficient windows, rooftop insulation and a photovoltaic system, yields a profit during a 30-year investment period. None of the packages containing a district heat exchanger yield a profit. The simulation results show that by implementing any of the geothermal heat pump packages, the demands for classifying the building according to an NZE building are fulfilled. Regarding the district heating packages, only the package containing all the energy efficiency measures (energy efficient windows, rooftop insulation and PV) meets the demands to be classified as an NZE building. Regarding the environmental impact due to implementing the energy efficiency measures, the results show a reduced impact from applying the geothermal heat pump packages is equivalent to the energy consumption reductions. The results show that by implementing a district heating system, more than one additional energy efficiency measure must be applied to avoid an increased environmental impact. This thesis shows that implementing energy efficiency measures can decrease energy consumption and yield an economical profit to the existing building stock