## 5 Regulation Test of Facility
### Adjustment Test of the Temperature and Humidity Control System
#### 5.2.2 Adjustment Test of Humidity Control System

Table 7: Temperature distribution characteristics in the enclosed chamber when reaching the set value (\({}^{\circ}\)C). needed to be started. The moment to start the dehumidifier was set as \(t=0\) s. Figure 14 shows the variation process of humidity values at eight points and their average with time. As can be seen from the figure, when the dehumidifier worked to \(t=2110\) s (\(35.17\) min), the eight humidity values and their average all met \(\left.\left|H-H_{\mathrm{set}}\right|<4\%\mathrm{RH}\right.\), which means that the humidity in the enclosed chamber reached the set value. During the period from \(t=2110\) s to \(3125\) s (\(3125\) s \(-2110\) s \(=1015\) s \(=16.92\) min), the humidity values of the eight locations and their average maintained constant under the criterion of \(\left.\left|H-H_{\mathrm{set}}\right|<4\%\mathrm{RH}\right.\), and the control result had no overshoot (In Figure 14, the \"Upper\" and \"Lower\" represent the upper and lower limits of humidity values permitted by the design criteria, similar for the subsequent figures.). For the adjustment test under temperature \(30\)\({}^{\circ}\)C, the set (target) humidity was \(60\%\mathrm{RH}\), while the initial humidity was \(19.2\%\mathrm{RH}\).Since the target humidity was higher than the initial value, the humidifier needed to be started. Figure 15 shows the humidity evolution history from the initial value \(19.2\%\mathrm{RH}\) to the target value \(60\%\mathrm{RH}\). It can be seen from the figure that when the humidification arrived at \(t=1000\) s (\(16.67\) min), the \(8\) humidities and their average all satisfied \(\left.\left|H-H_{\mathrm{set}}\right|<4\%\mathrm{RH}\right.\), which implies that the humidity in the enclosed chamber reached the set value. In the period from \(t=1000\) s to \(2700\) s, the \(8\)humidity values and their average maintained constant under the criterion of \(\left.\left|H-H_{\mathrm{set}}\right|<4\%\mathrm{RH}\right.\) without overshoot, and the duration to keep constant humidity is at least \(2700\) s \(-\)\(1000\) s \(=1700\) s \(=28.33\) min. Figure 14: Variation history of \(8\) humidities and their average in control process from \(42.7\%\mathrm{RH}\) to \(20\%\mathrm{RH}\) under ambient atmospheric temperature \(T=21.5\)\({}^{\circ}\)C.  
Figure 15: Variation history of eight humidities and their average when humidified from \(19.2\%\mathrm{RH}\) to \(60\%\mathrm{RH}\) under \(30\)\({}^{\circ}\)C.  
For the humidity adjustment case under temperature 40 \({}^{\circ}\)C, the target humidity was 80%RH, and the initial humidity is 57.1%RH. The humidifier needed to be started to increase the humidity. Figure 16 presents the humidity variation with time. It is found that when the humidification lasted to \(t=1330\) s (22.17 min), the eight humidities and their average all met \(\left|H-H_{\text{set}}\right|<4\%\)RH, which signifies that the humidity in the enclosed chamber reached the set value. In the period from \(t=1330\) s to 2700 s, the eight humidities and their average maintained constant under the standard of \(\left|H-H_{\text{set}}\right|<4\%\)RH without overshoot, and the duration to keep humidity constant is at least 2700 s \(-\) 1330 s \(=1370\) s \(=22.83\) min. Table 8 gives the characteristic parameters obtained from the nine cases of humidity control adjustment tests. In the table, the \"\(\pm\)numbers\" attached to the average humidity value (\(H_{\text{avg}}\)) represents the fluctuations of \(H_{\text{avg}}\) during the constant humidity maintenance period of time after the humidity reached the set value (under the criterion of \(\left|H-H_{\text{set}}\right|<4\%\)RH), where the fluctuations do not exceed 1.7%RH. As shown in Table 8, the humidity in the enclosed chamber can be adjusted from the initial humidity to the set humidity according to the design criterion \(\left|H-H_{\text{set}}\right|<4\%\)RH via humidification or dehumidification after a period of time \(t_{\text{r}H}\) (between 10 and 80 min) under a specified set temperature.