This bachelor's thesis examines the indoor environmental quality in a room of an older, thermally uninsulated single-family residential building. The aim of the study was to assess the indoor environmental conditions in the selected room and to investigate the influence of the building envelope characteristics, meteorological conditions, and ventilation habits on selected indoor environmental quality parameters. The study is based on continuous measurements of indoor air temperature, relative humidity, carbon dioxide concentration, and surface temperatures during both the heating and non-heating seasons. The analysis was supplemented with meteorological data from the nearest Slovenian Environment Agency (ARSO) weather station and a thermographic survey of the building envelope. The measured values were compared with the applicable regulatory requirements and recommendations for indoor environmental quality. The analysis of indoor air temperature in the bedroom showed that the proportion of measurements within the recommended temperature range (Rules on Ventilation and Air Conditioning of Buildings, 2002) was higher during the heating season (44,8 %) than during the non-heating season (15,4 %). Relative humidity remained within the recommended range for most of the monitoring period, while occasional deviations were associated with occupant behaviour and meteorological conditions. The proportion of time during which relative air humidity was within the recommended range was significantly higher during the non-heating season (78,9 %) than during the heating season (29,5 %). During occupancy, carbon dioxide concentrations frequently exceeded the recommended limit of 1000 ppm, indicating that the existing ventilation habits did not provide sufficient air exchange. The thermographic survey revealed deficiencies around windows, doors, and structural junctions, where the lowest surface temperatures were detected. Based on the results, recommendations were developed to improve indoor environmental quality, including optimization of ventilation practices, enhancement of the thermal performance of the building envelope, and the use of advanced materials such as phase change materials (PCM).
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