## 5 Results and Discussion
### Off-Design Performance  
The heat load and COP for different inlet temperatures of the hot water are exhibited in Figure 6. It is seen that the heat load of the generator and the cooling capacity of the absorption subsystem grow with the enhancement of the hot water temperature, owing to the rise of the generator temperature. Because the cooling output of the absorption subsystem serves as the subcooling power in the compression subsystem, the performance of the hybrid system also becomes better with the increase of inlet temperature in the hot water. The heat load of the generator and the cooling output of the absorption subsystem and hybrid system rises by 77.15%, 97.63% and 10.07%, respectively, when the inlet temperature of the hot water enhances by 35 \({}^{\circ}\)C. Meanwhile, the COP of the absorption and hybrid subsystem increases by 11.55% and 9.01%, respectively. Moreover, the heat load of the condenser in the compression subsystem and compressor work is insensitive to the change of the hot water temperature, which is similar to the trend of our previous study [23]. The heat load and COP for different inlet temperatures of the cooling water are shown in Figure 7. It is noteworthy that the cooling water of the absorber and two condensers are from the same cooling tower. Hence, the variation of cooling water temperature influences the above-mentioned three components and results in two opposite behaviors regarding the absorption subsystem. The improvement of the cooling water temperature in the condenser of the compression subsystem increases the chilled water temperature of the absorption subsystem, i.e., the inlet/outlet temperature of circulation water in the subcooler goes up from 9.48 \({}^{\circ}\)C/7.19 \({}^{\circ}\)C to 18.8 \({}^{\circ}\)C/16.75 \({}^{\circ}\)C when the \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Point** & **\(p\) (kPa)** & **\(T\) (\({}^{\circ}\)C)** & **Point** & **\(p\) (kPa)** & **\(T\) (\({}^{\circ}\)C)** \\ \hline
1 & 100 & 70 & 10 & 100 & 36.43 \\
2 & 100 & 66.44 & 11 & 2340.9 & 38.66 \\
3 & 100 & 18.8 & 12 & 2340.9 & 22.18 \\
4 & 100 & 16.75 & 13 & 909.36 & 4.16 \\
5 & 100 & 32 & 14 & 909.36 & 4.16 \\
6 & 100 & 36.25 & 15 & 2340.9 & 61.16 \\
7 & 100 & 32 & 16 & 100 & 12 \\
8 & 100 & 34.58 & 17 & 100 & 6.71 \\
9 & 100 & 32 & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 4: State property of each point in design condition. Figure 5: Performance of hybrid system in the design condition. inlet temperature of the cooling water rises from 26 \({}^{\circ}\)C to 32 \({}^{\circ}\)C, increasing the cooling capacity and COP of the absorption subsystem. However, the absorber temperature and condenser temperature in the absorption chiller enhances as well and leads to the deterioration of performance. It is seen that the performance of the absorption subsystem deteriorates with the rise of the cooling water temperature because the neglect influence is stronger. In addition, the compressor work goes up and the condenser heat load, cooling capacity, as well as the COP of the compression subsystem reduces with the rise of the cooling water temperature, as expected. The heat load of the generator, evaporator in the absorption subsystem, and the condenser and evaporator in the compression subsystem falls by 17.71%, 21.02%, 2.61% and 11.93%, respectively, and the work of the compressor grows by 38.65% when the inlet temperature of the cooling water rises by 12 \({}^{\circ}\)C. Simultaneously, the COP of the absorption and hybrid system drops by 4.02% and 36.48%, respectively. Figure 6: Performance with the inlet temperature of hot water. Figure 7: Performance with the inlet temperature of cooling water. The heat load and COP for the different inlet temperatures of the chilled water are shown in Figure 8. The increase in the inlet temperature in the chilled water increases the suction density of the compressor such that the flow rate of the refrigerant in the compression subsystem increases.