The purpose of the thesis is to evaluate the indoor air quality (IAQ) in a renovated multi-family building in Ljubljana using the Level(s) method, a unified framework for the sustainable assessment of buildings throughout their lifecycle, based on EU legislation. For the research, we focused on the indicator 4.1. Indoor Air Quality with which we assessed the building's properties after occupancy (level 3). The study is divided into five sections: 1. examination of Level(s) framework; 2. study of indicator 4.1. Indoor Air Quality; 3. establishment of a methodology for evaluating IAQ; 4. execution of measurements of selected IAQ parameters (level 3) and assessment of IAQ category; 5. a set of measures to improve IAQ. Measurements of CO2 concentrations (CCO2) (from September 1st to October 17th, 2023), relative humidity (RHa) and air temperature (Ta) (from September 1st to September 24th, 2023) were performed in three different rooms within the apartment: bedroom (S), living room (DS) and kitchen (K). Following the Level(s) methodology and SIST EN 16798-1:2019, we determined the duration of measurements (h) and the percentage of the observation period (%) during which indoor conditions met the indoor environmental quality categories (I – IV). The existing ventilation system did not consistently achieve category I conditions throughout the measurement period. The most significant deviations from recommended values for category I occurred in RHa (category I: 40-60 %), where measured values exceeded recommendations in S for 72 % of the observed period, DS for 75 % and K for 76 %. Regarding CCO2, the most problematic space was S, with measured values deviating from the recommended values (category I: < 800 ppm) for 34 % of the measurement period. Regarding Ta, the most significant deviations from recommended values (category I: 23.5-25.5 °C) were observed in K, where 63 % of the observed period exceeded recommended values. The apartment also had a mechanical ventilation system installed, so we examined how CCO2 was affected by three different ventilation scenarios: 1. normal intensity of mechanical ventilation; 2. mechanical ventilation not operating; 3. higher intensity of mechanical ventilation. In scenario 1, CCO2 ranged from 451 ppm to 1542 ppm (average 831 ppm); in scenario 2, it ranged from 452 ppm to 1009 ppm (average 742 ppm, with no occupants present), and in scenario 3, it ranged from 433 ppm to 1609 ppm (average 731 ppm). In conclusion, we proposed measures to optimize the ventilation strategy for the apartment.
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