## 6 Results
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Cluster** & **Keywords** & **Label** & **2020** & **2021** & **2022** \\ \hline \multirow{2}{*}{1} & [’reconstruction of the energy generation system’, ’room adaptation’, ‘energy media distribution’] & Energy Generation System & 81 & 80 & 73 \\ \hline \multirow{4}{*}{2} & [’elevator installation’, ‘replacement of window joinery’, ’bathroom renovation’, ‘renovation of roofing’, ‘wall insulation’, ‘installation works’, ‘assembly of a new lift’] & Reducing Energy Consumption & 83 & 86 & 102 \\ \hline \multirow{4}{*}{3} & [’application of sun protection film’, ‘replacement of window joinery’, ‘assembly’, ‘antenna’, ‘installation’, ‘technics’, ‘reconstruction’, ‘adaptation’, ‘computers’] & Thermal Protection Of Windows & 42 & 50 & 45 \\ \hline \multirow{4}{*}{4} & [’facade renovation’, ‘input’, ‘exchange’, ‘customization’, ‘installation’, ‘upgrade’, ‘chimney’, ‘electrical’, ‘modernization’, ‘technology’] & Complex Reconstruction & 61 & 54 & 52 \\ \hline \multirow{4}{*}{5} & [’installation’, ‘upgrade’, ‘extension’, ‘adjustment’, ‘rebuilding’, ‘power supply’, ‘electrics’, ‘photovoltaics’, ‘air conditioning’, ‘heating’] & Photovoltaic & 77 & 49 & 69 \\ \hline \multirow{4}{*}{6} & [’rebuilding’, ‘installation’, ‘adaptation’, ‘sanitation’, ‘upgrade’, ‘replacement’, ‘center’, ‘network’, ‘technological’] & Energy Savings & 47 & 39 & 50 \\ \hline \multirow{4}{*}{7} & [’installation’, ‘roofing replacement’, ‘upgrade’, ‘customization’, ‘rebuilding’, ‘works’, ‘ventilation’, ‘air conditioning’] & Vertilation System & 52 & 38 & 49 \\ \hline \multirow{4}{*}{8} & [’facade’, ‘replacement’, ‘lighting installation’, ‘upgrade’, ‘works’, ‘reconstruction’, ‘coverage’] & Lighting System & 64 & 52 & 52 \\ \hline \multirow{4}{*}{9} & [’upgrade’, ‘customization’, ‘IT’, ‘centre’, ‘elevation’, ‘reconstruction of installation’] & Electrical Installation & 67 & 53 & 68 \\ \hline \multirow{4}{*}{10} & [’replacement of window joinery’, ‘roofing replacement’, ‘ceramic tiles’, ‘installation’, ‘replacement’, ‘thermal insulation’] & Thermal Insulation Works & 86 & 108 & 98 \\ \hline \multirow{4}{*}{11} & [’modernization of lighting’, ‘centre’, ‘adjustment’, ‘modernization of sanitary facilities’, ‘installation’, ‘upgrade’, ‘lighting’, ‘sanitation’, ‘electricity installation’, ‘mounting’] & Sanitary Facilities & 96 & 67 & 121 \\ \hline \multirow{4}{*}{12} & [’air conditioning’, ‘central heating installation’, ‘room modernization’, ‘roof renovation’, ‘modernization of installation’] & Cooling \& Heating System & 93 & 71 & 96 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Topic analysis for 2020–2022. The second topic included n-grams such as \"elevator installation\", \"window joinery replacement\", \"bathroom renovation\", and \"installation works\". This topic reflected considerations around the design and architectural elements of university buildings that could contribute to the reduction of energy consumption. The third topic incorporated n-grams such as \"sun protection film\", \"window joinery replacement\", \"installation\", and \"assembly\". This topic implied a focus on adhering to enhancing the thermal efficiency and insulation properties of windows in university buildings. By analyzing the discussions within this cluster, researchers and practitioners can gain valuable knowledge to inform decision-making, design considerations, and energy efficiency initiatives related to windows in university buildings. The fourth topic encompassed terms such as \"facade renovation\", \"modernization\", \"upgrade\", and \"customization\". This topic represented broader sustainability initiatives in universities, indicating that energy efficiency was being viewed within the larger context of reconstruction and renovation of complex university buildings. The fifth topic encompassed terms such as \"photovoltaic\", \"air conditioning\", \"heating system\", and \"customization\".