Kartläggning av brukarnas påverkan på en byggnads energianvändning : Fallstudie på Engesberg herrgård i Gävle

This study aims to investigate how user behavior affects the total energy consumption in a recently renovated culturally and historically significant building, as well as to identify possible energy efficiency measures. The study also includes a cost analysis of the proposed measures and a comparison of the building’s energy performance against the Swedish National Board of Housing, Building and Planning’s (Boverket) requirements for new construction. Given that the vast majority of buildings within the EU were constructed before the year 2000, and that a significant portion of these are considered to have poor energy performance, there is considerable potential within the existing building stock. The work has been carried out as a case study on Engesberg Manor in Gävle, a building from the 18th century that was renovated in 2023 into a multi-family residence with six apartments. Since the building had remained unoccupied since it was put into operation, a unique opportunity arose to analyze its energy performance without user influence. To reliably address the research questions, the energy simulation software IDA ICE was used. An energy model of the building was developed and calibrated based on the measured energy use unaffected by occupancy. The model was validated according to the ASHRAE Guideline 14 to ensure reliable results. Data collection for the energy model included on-site measurements, review of technical documentation and design phase records, as well as correspondence with the project manager. Subsequently, user input data from Sveby versions 1.0 and 2.0 were applied to examine the impact of user behavior on the building’s energy consumption. To assess the efficiency and cost-effectiveness of potential energy efficiency measures, a Life Cycle Cost (LCC) analysis was conducted. The results show that user behavior has a significant impact on the building’s total energy consumption, which nearly doubled when using standard occupancy input data from Sveby version 1.0. Furthermore, the study demonstrated that the only energy efficiency measure feasible in consideration of the building's cultural heritage values is the addition of insulation to the roof, which was found not to be cost-effective. Finally, it can be concluded that the building does not meet all of Boverket’s energy requirements (BBR 29), either before or after the implementation of the measure.