## 5 Regulation Test of Facility
### Adjustment Test of the Temperature and Humidity Control System
#### 5.2.1 Adjustment Test of Temperature Control System
Figure 13 shows the temperature evolution history during the heating process from the real initial temperature 49.8 \({}^{\circ}\)C to the set temperature 60 \({}^{\circ}\)C. The figure indicates that when the enclosed chamber was heated to \(t=5200\) s (86.67 min), the eight temperatures and their average satisfied \(|\,T-T_{\rm set}|<\) 0.5 \({}^{\circ}\)C, but only maintained this situation to 5500 s at which the No. 4 transducer jumped out of the criterion \(|\,T-T_{\rm set}|<\) 0.5 \({}^{\circ}\)C. If the judgment criterion was changed from \(|\,T-T_{\rm set}|<\) 0.5 \({}^{\circ}\)C to \(|\,T-T_{\rm set}|<\) 1.0 \({}^{\circ}\)C, then at \(t=3500\) s (58.33 min), the eight temperatures and their average met \(|\,T-T_{\rm set}|<\) 1.0 \({}^{\circ}\)C, and maintained \(|\,T-T_{\rm set}|<\) 1.0 \({}^{\circ}\)C to \(t=6060\) s, thus the temperature can be kept constant at least for 6060 s \(-\) 3500 s = 2560 s = 42.67 min. In Figure 13, the \"Upper\" and \"Lower\" represent 60 \(\pm\) 0.5 \({}^{\circ}\)C instead of 60 \(\pm\) 1 \({}^{\circ}\)C.  
Figure 12: Variation of eight temperatures and their average during heating from 29.9 \({}^{\circ}\)C to 40 \({}^{\circ}\)C.  
Table 6 presents the heating performances of all five heating processes. The \"\(\pm\)numbers\" attached after the average temperature \(T_{\rm avg}\) in the table indicates the fluctuation of the average temperature during constant temperature maintenance stage after eight temperatures had reached each set temperature, and the fluctuation does not exceed 0.5 \({}^{\circ}\)C. As can be seen from Table 6, after a period of time (\(t_{\rm{r,}T}\), between 58 min and 123 min) of heating, the eight temperatures and their average can reach each set temperature according to a certain criterion. For the first three set temperatures, a higher criterion \(\mid\!T-T_{\rm{set}}\!\mid\!<\) 0.5 \({}^{\circ}\)C can be met, while for the last two set temperatures involved with 60 \({}^{\circ}\)C, the design target \(\mid\!T-T_{\rm{set}}\!\mid\!<\) 1.0 \({}^{\circ}\)C can be satisfied. The time needed for the temperature to reach the set value is less than 100 min in most cases and a little greater than 120 min in one case. It can also be found in Table 6 that in all five cases, the temperature can be kept constant for a long enough time (\(t_{\rm{m,}T}\), between 20 min and 36 min) after reaching each set temperature. The results given in the table are only a segment of time recorded in the adjustment test. It is believed that the temperature would be kept constant longer if heating and record were continued. This constant-temperature maintaining time is sufficient for the hot-wire calibration at specified temperatures. Table 7 lists the spatial distribution characteristic parameters of temperature at the moment when the eight temperatures reach the set value in each of the five cases according to the error requirements (\(\mid\!T-T_{\rm{set}}\!\mid\!<\) 0.5 \({}^{\circ}\)C or \(\mid\!T-T_{\rm{set}}\!\mid\!<\) 1 \({}^{\circ}\)C), where the maximum in the five values (five \(T_{\rm{set}}\) conditions) of \(\mid\!T_{i}-T_{\rm{avg}}\!\mid\!_{\rm{max}}\) is 0.8 \({}^{\circ}\)C, while the maximum of \(\sigma_{T}\) is 0.279 \({}^{\circ}\)C. The maximum of five \(\mid\!T-T_{\rm{set}}\!\mid\!_{\rm{max}}\) values equal to 0.9 \({}^{\circ}\)C \(<\) 1 \({}^{\circ}\)C shows that the temperature values of all eight points meet the design target of control accuracy \(\pm\)1 \({}^{\circ}\)C. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \(T_{\rm{set}}\) (\({}^{\circ}\)C) & \(T_{\rm{ini}}\) (\({}^{\circ}\)C) & \(T_{\rm{avg}}\) (\({}^{\circ}\)C) & \(t_{\rm{r,}T}\) (min) & \(t_{\rm{m,}T}\) (min) \\ \hline
30 & 23.5 & 29.9 \(\pm\) 0.3 & 95 & 36.67 \\
40 & 29.9 & 39.7 \(\pm\) 0.2 & 75 & 20 \\
50 & 38.1 & 50.0 \(\pm\) 0.4 & 96.67 & 25 \\
60 & 49.8 & 60.1 \(\pm\) 0.4 & 58 & 42 \\
60 & 26.9 & 60.1 \(\pm\) 0.4 & 123 & 21.67 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Time required to reach the set temperature and time during which the temperature maintains the set value.