The master’s thesis addresses the overheating resistance of a multi-apartment building under current climatic conditions and projected climate change, using a case study of a residential building in Ljubljana. The analysis is based on dynamic energy simulations performed for a reference climate and future climate scenarios in order to assess the impact of rising outdoor temperatures on the building’s energy balance and indoor thermal conditions. Particular attention is given to a critical apartment with the highest cooling demand. The thermal performance is evaluated using annual energy indicators and hourly overheating indicators, including the number of hours above 26 °C and degree-hours above this threshold temperature. To assess the passive resistance of the building to overheating, a building model without active cooling was used. The study further examines selected passive adaptation measures, including the reduction of solar gains by lowering the glazing g-value, time-controlled external shading, and enhanced night-time ventilation. The simulation results indicate that future climate scenarios will increase cooling demand and raise the risk of indoor overheating, whereas implementing the analysed passive measures can significantly reduce summer thermal loads and improve indoor thermal conditions in the apartment. The thesis also considers the energy and economic aspects of implementing these measures and their role in the long-term adaptation of multi-apartment buildings to changing climate conditions, showing that a well-designed combination of passive strategies can significantly reduce overheating and improve thermal comfort in residential buildings.
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