## 4 Results
Figure 15 shows that, regarding the amount of heat supplied in the system generator, there is a limit that is not convenient to exceed since the performance of the absorption cooling system will be affected negatively, this is due to the fact that, experimentally in the generator, a thermal energy supply beyond the maximum point does not produce an equivalent cooling effect, so the coefficient of performance is reduced. Figure 5.5 Variation of the generation and cooling powers for the different condensation temperatures. Figure 5.6 Behavior of the external coefficient of performance (COP) as a function of the generation power. Finally, Figure 16, shows the variation in internal and external coefficients of performance as well as the exergy efficiency for the absorption cooling system, as a consequence of the simultaneous variation in the temperatures of the heating water and the water to be chilled in the evaporator. It is observed that during the experimental test, the internal coefficient of performance showed a slightly increasing trend, which is due to the effect of increasing the temperature of the heating water. On the other hand, the curve corresponding to the external COP shows a downward trend, which indicates that this parameter is more sensitive to the changes in the temperature of the water to be chilled than to the changes in the heating water temperature. The exergy efficiency was calculated using exclusively external parameters. Figure 16 demonstrates that the highest exergy efficiency is obtained when the heating water temperature is minimum, in spite of the temperature of the water to be chilled, this fact would suggest that the higher generation temperatures the higher exergy destruction is obtained. In Table 5, the values for the solar coefficient of performance as well as the exergy efficiency at a condensation water temperature of 20 \({}^{\circ}\)C are presented. On the other hand, the mean daily efficiency and cooling production that would be achieved with the combined system, is presented in Figure 5.7 These values were calculated taking into account the solar irradiance gained during the tests presented in this section, as well as the period of time during which the heating fluid temperature in the tank was constant. Moreover, it was considered that the temperature registered in the storage tank was the fluid temperature at the inlet port of the generator. This consideration implies that there is not any heat transfer from the fluid to the surroundings in the connection pipeline from the storage tank to the absorption cooling system, it could be a reasonable consideration if the pipeline is thermally insulated. The values in this table correspond to a condensation water temperature of 20 \({}^{\circ}\)C.  
Figure 5.8 COP and exergy efficiency variation as a function of the change in the temperatures of the chilled and heating water. \begin{table}
\begin{tabular}{c c c} \hline \hline  & **Solar COP** & **Exergy Efficiency** \\ \hline Minimum value & 0.023 & \(1.3\times 10^{-3}\) \\ Maximum value & 0.070 & \(4.4\times 10^{-3}\) \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Expected performance parameters for the combined system.