This master's thesis addresses the impact of glazing on building energy use and the search for optimal thermal and solar transmittance is examined. Glazing has a significant influence on the overall energy balance, with its effect varying according to climate, orientation, and the integration of building-integrated PV systems. The research metodology is based on parametric and dynamic analysis using the software tools WINDOW and IDA ICE. Data processing and results analysis were carried out in the Python programming language. The analysis was performed for three locations: Ljubljana, Malaga, and Tromso, while also considering future scenarios up to the year 2050. The results show that in cold climates low thermal transmittance is crucial, whereas in warm climates reducing solar gains with low g-values plays a decisive role. PV systems significantly reduce primary energy use, particularly on the south orientation. Based on the obtained results, model equations were developed to calculate the optimal glazing properties. Finally, a life cycle cost analysis was carried out to evaluate the economic implications of different design choices.
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