## 3 Results and Discussion
### Test and Evaluation of Hygroscopicity and Practical Moisture Buffering Performance
#### 3.2.1 Hygroscopicity Test in Winter  
The measured indoor temperature and humidity of the two tested rooms for January is shown in Figure 11. Both rooms have been heated and humidified by the air conditioner and humidifier, respectively. The indoor temperature is set as 24 \({}^{\circ}\)C. The outdoor temperature was measured at the range of 4 \({}^{\circ}\)C-6 \({}^{\circ}\)C, relative humidity is between 95% and 99%, which is a typical wet and cold climate condition. It can be seen in Figure 12 that the indoor temperature is basically stable at 14:00, and the temperature continues to be around 24 \({}^{\circ}\)C, with little difference between the two rooms. The indoor relative humidity and moisture content of the two tested rooms are compared and the results are shown in Figures 13 and 14, where it is indicated that the indoor air moisture content increases after humidification. After the humidification finishes, the relative humidity and moisture content of the  
Figure 10: Two types of mortar wall (without primer and finish). Figure 9: Thermal conductivity as a function of relative humidity for specimens. room with CM do not change, but the fluctuation is obvious, while the relative humidity and moisture content of the room with CHM-WSE decreases gradually, the relative humidity is 14.3% lower than that of the room with CM, and the air moisture content is reduced by 3.1 g/kg-dry air. Figure 15 shows that the relative humidity of monitoring points in room with CM fluctuates more frequently. According to the relative humidity distribution curve of the room with CHM-WSE (Room II) (Figure 16), the relative humidity curve is relatively smooth and has a downward trend except for ceilings, which has an obvious fluctuation, and this is because the ceiling is not covered with CHM-WSE. The test room volume is 36.48 m\({}^{3}\), the usable area of CHM-WSE is 40.8 m\({}^{2}\), and the moisture absorption capacity per unit area of the CHM-WSE is 2.77 g/m\({}^{2}\). Figure 11: Outdoor temperature and humidity test in January. Figure 12: Indoor temperature in the center of the room. Figure 13: Indoor relative humidity in the center of the room. In the testing area, n points are selected and the temperature and relative humidity of each point are measured respectively. The arithmetic mean value is as follows:  
\[\overline{t}=\frac{\sum{t_{i}}}{n} \tag{9}\]  
\[\overline{\phi}=\frac{\sum{\phi_{i}}}{n} \tag{10}\]  
The root-mean-square deviation is calculated as:  
\[\sigma_{t}=\sqrt{\frac{\sum{\left({t_{i}-\overline{t}}\right)^{2}}}{n}} \tag{11}\]  
\[\sigma_{\phi}=\sqrt{\frac{\sum{\left({\phi_{i}-\overline{\phi}}\right)^{2}}}{n}} \tag{12}\]  
The non-uniformity coefficient is calculated as:  
Figure 10:0  
Figure 10:1  
where \(t\) is the temperature, in \({}^{\circ}\)C; \(\phi\) is the relative humidity, in %; \(\sigma\) is the root-mean-square deviation; \(\kappa\) is the non-uniformity coefficient. According to the room temperature and humidity distribution (Figure 17) and the temperature and humidity non-uniformity coefficient (Table 10), the uniformity of temperature and relative humidity within the room with CHM-WSE is better than in the room with CM at 1.5 m above the floor. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Room**} & \multirow{2}{*}{**Parameter**} & \multicolumn{5}{c}{**Position**} & \multicolumn{2}{c}{**Non-Uniformity**} \\ \cline{3-8}  & & **P2** & **P3** & **P4** & **P5** & **P6** & **Coefficient** \\ \hline \multirow{2}{*}{Room I (CM)} & Temperature (\({}^{\circ}\)C) & 26.4 & 24.8 & 25.1 & 25.3 & 26.1 & 0.0238 \\  & Relative humidity (\%) & 48 & 46.8 & 51.1 & 50.4 & 49.6 & 0.0320 \\ \hline \multirow{2}{*}{Room II (CHM-WSE)} & Temperature (\({}^{\circ}\)C) & 25.1 & 24.1 & 24.2 & 25.2 & 24.8 & 0.0184 \\  & Relative humidity (\%) & 38.9 & 40.7 & 38.7 & 39.4 & 38.1 & 0.0224 \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Non-uniformity coefficient under air-conditioning condition. (Time: 8:30 the next day).