## 6 Results
### Measures for Improvement of Elements of Thermal Envelope
\begin{table}
\begin{tabular}{l c c c c c} \hline \hline
**Sports Facility** & \multicolumn{3}{c}{**Existing Situation before Implementation of Energy-Efficiency Measures**} & \multicolumn{1}{c}{**After Applying Proposed Measures**} \\ \cline{2-6}
**Positions of the Thermal Envelope** & **U** & **Umax** & **A** & **Hts** & **A1** \\ \cline{2-6}
**Positions of the Thermal Envelope** & **W/m\({}^{2}\)K** & **W/m\({}^{2}\)K** & **m\({}^{2}\)** & **W/K** & **Rock Wool (15 cm)** \\ \cline{2-6}
**External wall of the facility** & **2.0** & **0.15** & **1832.1** & **3664.2** & **0.2** \\ \hline \multicolumn{6}{c}{} \\ \multirow{2}{*}{**Fulfilled condition of thermal comfort—office**} & & & & 21.4\% when occupied comfort index is 6-8 \\  & & & & (comfort index values are taken from IES VE, \\  & & & Integrated Environmental Solutions Virtual \\  & & & Environment) & 15.5\% when occupied comfort index is 6-8 \\ \hline \multicolumn{6}{c}{} \\ \multirow{2}{*}{**Ground floor of the facility**} & **1.31** & **0.15** & **4923.2** & **3224.7** & **U W/m\({}^{2}\)K** \\ \cline{2-6}  & & & & & 0.18 \\ \hline \multicolumn{6}{c}{} \\ \multirow{2}{*}{**Rood**} & **1.20** & **0.15** & **4923.2** & **5904.8** & **U W/m\({}^{2}\)K** \\ \cline{2-6}  & & & & & 0.15 \\ \hline \multicolumn{6}{c}{} \\ \multirow{2}{*}{**Glazed area**} & **3.2** & **0.85** & **2530.9** & **5669.2** & **U W/m\({}^{2}\)K** \\ \cline{2-6}  & & & & & 1.01 glass only 0.78 \\ \cline{2-6}  & & & & & 15.5\% when occupied comfort index is 6-8 \\ \hline \multicolumn{6}{c}{} \\ \multirow{2}{*}{**C\({}_{\text{max}}\)**} & **kWh/m\({}^{2}\)** & & & & 1021.7 \\ \cline{2-6}  & Energy grade Q\({}_{\text{h, not, rel}}\) & & & & \(\text{Q}_{\text{h, not, rel}}=\text{186.7\% E}\) & \(\text{Q}_{\text{h, not, rel}}=\text{63.47\% C}\) \\ \multicolumn{6}{c}{} \\ \multirow{2}{*}{**Energy savings**} & & & & & 64.9\% \\ \hline \multicolumn{6}{c}{} \\ \multirow{2}{*}{**Actively thermal comfort in the building sport hall [\({}^{\circ}\)C] at 13.4\%} & & & & 21.7\% when occupied comfort index is 6-8 \\ \hline \multicolumn{6}{c}{} \\ \multirow{2}{*}{**Q\({}_{\text{Dond}}\) at 1021.7 kWh/m\({}^{2}\)**} & & & & 358.5 \\ \cline{2-6}  & Energy grade Q\({}_{\text{h, not, rel}}=\text{180\% E}\) & & & \(\text{Q}_{\text{h, not, rel}}=\text{63.47\% C}\) \\ \hline \multicolumn{6}{c}{} \\ \multirow{2}{*}{**Energy savings**} & **[\%]** & & & 64.9\% \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Improvement scenario 3- energy consumption and comfort index. Implementing measures that fulfill the minimum requirements of the EnerPHit certification can lead to substantial energy savings for heating, totaling 51.6%. When a comprehensive set of measures is applied to all selected areas, the building achieves a C energy rating. Additionally, comfort conditions in the office were enhanced, with the percentage of time considered comfortable increasing from 13.1% to 15.5%. If the mentioned improvement measures are applied only to the universal hall in the facility, considering it as a separate thermal zone, it is possible to achieve an improvement in the entire facility by one energy class through the implementation of the package of proposed measures. If all measures are applied, the energy savings are 20%. Improvement scenario 3, total facility retrofitting, is presented in Table 7.  
A 64.9% energy saving was achieved by applying the mentioned measures to the entire building, which improved the building by two energy levels.