## 3 Results and Discussion
### Application of the Composite Hygroscopic Material in Different Climate Regions
The results (Figures 29 and 30) of building load indicated that both the heating load and cooling load of the room with CHM-WSE is lower than that of the room with CM. Figure 27: Indoor relative humidity in heating season (Xi’an). Figure 25: Heating Load (Changsha). * Hot summer and warm winter region (HSWW)  
Guangzhou is chosen as the typical city in the hot summer and warm winter region. This region has high humidity throughout the year. In the unheated hot summer and warm winter region, in the room where the CHM-WSE is used, the indoor relative humidity is reduced in winter by about 10% (Figure 31) and the relative humidity in summer is controlled at 55-70% with a small fluctuation range (Figure 32). It can be seen in Figure 33 that the heating load of Guangzhou is very small. The results also show that the building cooling load of the room with CHM-WSE is lower than that of the room with CM (Figure 34). Figure 30: Cooling load (Xi’an). Figure 28: Indoor relative humidity in cooling season (Xi’an). The relative humidity and energy saving rate of the two rooms are compared and analyzed based on the simulation results of different cities. The results in Table 15 shows that in the heating season, the room with CHM-WSE in the HSCW region has better energy-saving performance, and the energy consumption rate is 20% lower than that in the room with CM. The energy consumption rate of the latent cooling load in HSWW region is the lowest, which is 12.4% lower than that in the room with CM. In the cooling season, there is little difference in the energy-saving rate of the total cooling load, and the energy-saving performance of latent cooling load in the cold region is better. Figure 31: Indoor relative humidity in heating season (Guangzhou). Figure 32: Indoor relative humidity in cooling season (Guangzhou). Figure 33: Heating load (Guangzhou). According to the simulation results, the compound humidity control mortar not only maintains the stable relative humidity in the room, but also has the function of heat preservation and humidity adjustment. Figure 35 indicates that annual energy-saving rate per unit area of Changsha, Wuhan, Nanjing, Guangzhou, Xi'an are about 24.8%, 23.2%, 22.3%, 21.3%, 20.6%, respectively. Compared with the room with CM, the energy saving rate of the room with CHM-WSE in the cold region is the smallest, followed by the hot summer and warm summer region. It can be concluded that the compound humidity control mortar can keep stable relative humidity indoor. At the same time it also can play as an insulation material for the building envelope. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{3}{*}{**Typical City**} & \multicolumn{4}{c}{**Heating Season**} & \multicolumn{4}{c}{**Cooling Season**} \\ \cline{2-9}  & \begin{tabular}{c} **Relative** \\ **Humidity (\%)** \\ \end{tabular} & \begin{tabular}{c} **Sensible** \\ **Heating Load** \\ \end{tabular} & \begin{tabular}{c} **Relative** \\ **Humidity (\%)** \\ \end{tabular} & \begin{tabular}{c} **Sensible** \\ **Cooling** \\ **Load** \\ \end{tabular} & \begin{tabular}{c} **Latent** \\ **Cooling** \\ **Load** \\ \end{tabular} \\ \cline{2-9}  & \begin{tabular}{c} **CM** \\ **WSE** \\ \end{tabular} & \begin{tabular}{c} **CHM-** \\ **Rate * (\%)** \\ \end{tabular} & \begin{tabular}{c} **Energy Saving Rate** \\ **(\%)** \\ \end{tabular} & \begin{tabular}{c} **Energy** \\ **Saving Rate** \\ **(\%)** \\ \end{tabular} & \
\begin{tabular}{c} **Energy** \\ **Saving Rate** \\ **(\%)** \\ \end{tabular} &
\begin{tabular}{c} **Energy** \\ **Saving Rate** \\ **(\%)** \\ \end{tabular} \\ \hline Changsha & 50–70 & 45–65 & 20.6 & 40–90 & 50–70 & 24.0 & 12.3 & 20.5 \\ Wuhan & 40–72 & 40–65 & 18.4 & 40–97 & 50–60 & 24.8 & 12.4 & 20.9 \\ Nanjing & 35–72 & 35–60 & 19.4 & 45–95 & 55–60 & 24.4 & 11.1 & 20.5 \\ Xi’an & 25–68 & 30–55 & 17.2 & 40–90 & 50–70 & 21.8 & 15.7 & 20.1 \\ Guangzhou & 60–95 & 50–85 & 12.4 & 45–98 & 55–85 & 24.2 & 10.5 & 19.8 \\ \hline \hline \end{tabular}
\end{table}