## 3 Results
### Monitoring Results
#### 3.2.1 Monitoring of CO\({}_{2}\) Concentration through Different WW\({}_{\rm eq}\)Rs with DNVP  
The WW\({}_{\rm eq}\)R applied on site did not match totally with the WW\({}_{\rm eq}\)R described in the DNVP algorithm. The school staff suggested reducing some WW\({}_{\rm eq}\)Rs to avoid unwanted wind gusts from strong winds from 4.10% to 2.80%, and from 1.54% to 1.07%. The results gathered after several weeks of IAQ data monitoring during November to December 2021 can be seen in Figures 10-12. Figures 10 and 11 shows the evolution of the CO\({}_{2}\) concentration in ppm during the DNVP on-site monitoring, from the lowest (0.23%) to the highest (1.07%) WW\({}_{\rm eq}\)R, including the maximum ventilation flux at 2.80% WW\({}_{\rm eq}\)R. Figure 11 shows the CO\({}_{2}\) concentrations when WW\({}_{\rm eq}\)R is 2.16% with the SNVP. Figure 10 shows the CO\({}_{2}\) concentration evolution for different WW\({}_{\rm eq}\)Rs, from 0.23% to 1.07%. At each CO\({}_{2}\) concentration peak, the school building staff modify the WW\({}_{\rm eq}\)R to 2.80%, until the CO\({}_{2}\) falls below 400 ppm or to the lowest possible CO\({}_{2}\) concentration. The wind speed shown in Figure 10 indicates a great deviation from the average statistical conditions used in Section 3.1, which has a notable effect on the CO\({}_{2}\) concentration. In accordance with the strong wind and the promising results of the lower WW\({}_{\rm eq}\)R, the school building staff decided to slightly increase the WW\({}_{\rm eq}\)R to 1.07%, to reduce the TC unsatisfaction of the occupants. Therefore, in the last monitoring stint, between 12:30 and13:55, the CO\({}_{2}\) remains between 800 and 1000 ppm. Figure 11 shows the CO\({}_{2}\) concentration evolution for different WW\({}_{\rm eq}\)Rs, from 1.07% to 1.82%, with additional variations up to 2.80%, according to the DNVP algorithm. \begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \multirow{2}{*}{\(\mathrm{WW_{eq}R}\)} & \multirow{2}{*}{**Protocol**} & **09:10** & **09:30** & **10:00** & **10:30** & **11:00** & **11:30** & **12:00** & **12:30** & **13:00** & **13:30** & **14:00** & **Peak** \\  & & **09:30** & **10:00** & **10:30** & **11:00** & **11:30** & **12:00** & **12:30** & **13:00** & **13:30** & **14:00** & **Peak** \\ \hline
0.23 & DNVP & 608 & 643 & 637 & 641 & 634 & 620 & 485 & 579 & 627 & 640 & 641 \\ (\%) & *SNVP & 623 & 1274 * & 1764 * & 2063 * & 2261 * & 2414 * & 2136 * & 1827 * & 2191 * & 2416 * & 2416 * & 2416 * \\ \hline
0.45 & DNVP & 599 & 642 & 632 & 628 & 630 & 632 & 477 & 581 & 632 & 642 & 642 \\ (\%) & *SNVP & 613 & 1180 * & 1532 * & 1707 * & 1807 * & 1880 * & 1539 * & 1236 * & 1618 * & 1813 * & 1880 * \\ \hline
0.87 & DNVP & 593 & 652 & 645 & 647 & 644 & 642 & 427 & 573 & 644 & 649 & 649 \\ (\%) & *SNVP & 596 & 1037 * & 1229 * & 1292 * & 1320 * & 1340 * & 984 * & 790 * & 1173 * & 1302 * & 1340 * \\ \hline
1.54 & DNVP & 565 & 653 & 667 & 680 & 668 & 662 & 431 & 574 & 636 & 636 & 680 \\ (\%) & *SNVP & 569 & 861 * & 927 * & 937 * & 940 * & 943 * & 641 * & 602 * & 893 * & 937 * & 940 * \\ \hline
2.16 & DNVP & 543 & 729 & 750 & 752 & 755 & 757 & 469 & 544 & 745 & 757 & 757 \\ (\%) & SNVP & 547 & 749 & 773 & 774 & 774 & 774 & 525 & 551 & 758 & 771 & 774 \\ \hline
4.10 & DNVP & - & - & - & - & - & - & - & - & - & - & - \\ (\%) & SNVP & 544 & 544 & 544 & 544 & 544 & 544 & 481 & 418 & 532 & 544 & 544 \\ \hline \end{tabular} The results of CO\({}_{2}\) concentration are grouped by a set of rows for the same WW\({}_{\rm eq}\)R. Each column describes a 30 min time frame to show the average CO\({}_{2}\) concentration simulated every 30 min period. Values over the 800 ppm CO\({}_{2}\) limit are shown in red *.  
\end{table} 
Table 5: Simulation summary of average CO\({}_{2}\) concentration in ppm for several WW\({}_{\rm eq}\)Rs. Figure 11: CO\({}_{2}\) concentration for different WW\({}_{\rm eq}\)Rs with DNVP on the 26 th of November 2021. Figure 12: CO\({}_{2}\) concentration for 2.16% WW\({}_{\rm eq}\)R with SNVP on the 17 th of December 2021.