Renovations and Energy Planning : An energy performance and economics analysis in 3D-modelling

Abstract: This thesis examines the opportunities towards streamlining energy efficiency in the existing built environment in Sweden. Through this case study, the aim has been to optimise two 20th century buildings, one apartment building and one workshop building, located at different latitudes in the country. The goal has been to reduce the heat energy consumption, increase energy performance and lift the buildings to an energy class that meets the requirements for newly produced buildings, according to the regulations of Boverket. In the simulation software BIM Energy, the buildings have been the subjects of different renovation strategies in order to discover what measures are most energy efficient. An LCC analysis was performed to discover what measure is the most cost efficient in relation to its thermal energy improvements. The existing technical and energy data of each building have been used for the creation of a realistic simulation model as of its present conditions. The study has shown that a combination of renovations strategies generated the best results, and that the more expensive the intervention gets, the higher returns of investment. The study of energy performance showed that the new geographical adjustment factor and primary energy factor established by Boverket has a significant impact on how a building is classified, whereupon the choice of primary energy source can determine whether a building is ranked as passive house or energy thief. Though as standalone measures, when coming to reduction of the energy heat demand, a FTX-system have been proven superior with added external insulation as a solid second.