Comprehensive Analysis Through Energy Simulation Tools

This thesis by two building technology students explores how digital simulation tools can increase the energy efficiency of a Swedish multifamily building. It aims to simulate a solution that could enhance the building's energy performance compared to its current usage.

The proposed revision of the EPBD by the EU mandates residential buildings to achieve at least energy class E or higher by 2030, with a long-term goal for all national buildings to reach net-zero energy standards by 2050. In Sweden, where over 60% of multi-family buildings fall within energy classes E, F, or G, the impending EPBD revision could necessitate significant renovations. This report study energy efficiency optimization strategies using digital simulation tools like Rhinoceros, Grasshopper, Honeybee, and Ladybug. EnergyPlus simulation tool is explored to generate primary energy metrics and simulate modifications to the HVAC system and building envelope of a case-study building located in Jönköping.

The case-study building, situated at Östra Storgatan 81, currently holds an energy class E with a primary energy number of 110 [kWh/m2, year Atemp]. Simulation results demonstrate an enhancement, lifting the building to energy class C, reflecting a two-step advancement on the EU energy classification scale. The primary energy number is reduced to 66.1 [kWh/m², year Atemp], marking a 40% decrease in energy consumption.

Two energy simulation engines were employed, with results cross-verified for credibility. A comfort analysis further validated the findings. Despite challenges like accurately replicating the building's geometry and customizing HVAC systems, the analysis proved effective in illustrating primary energy consumption. This methodology offers insights into improving energy efficiency in buildings, crucial for meeting EU directives and sustainability goals.