## 5 Evaluation, Results and Discussion
### Real Solar Radiation  
The first test is for Mode 0, according to Figure 14a; the collector reaches a temperature higher than 110 \({}^{\circ}\)C, and the reference is kept constant at a low temperature of 68 \({}^{\circ}\)C, which allows us to have a greater use of cooling, but with low power. On the other hand, Mode 5 is shown in Figure 14b, reaching a collector temperature of 110 \({}^{\circ}\)C; due to the user's needs for more cooling power, a higher  
Figure 13: (**a**) Real solar radiation of a normal day of the state of Colima in seconds; (**b**) solar radiation of 500 kW/ m\({}^{2}\), which is considered as low radiation. (**a**) Real solar radiation; (**b**) solar radiation of 500 kW/m\({}^{2}\).  
The last mode of operation, called variable mode, reaches a collector temperature of 112 \({}^{\circ}\)C, and the reference varies at three different temperatures: starting with 68 \({}^{\circ}\)C, after 5 h, it reaches 70 \({}^{\circ}\)C; passing 1.38 h, it reaches 75 \({}^{\circ}\)C; after 14 h, the reference temperature drops from 75-70 \({}^{\circ}\)C; after 2 h, the reference drops back from 70-68 \({}^{\circ}\)C. This is the behavior of variable mode, which is regulated according to the solar radiation, as shown in Figure 14c.  
Figure 17a shows a simulation with different modes of operation varying in time, which is a situation dependent on the operator of the solar air-conditioning system. The variation of variable mode is shown in Figure 17a, where the modes operate from 0-5. The controller optimizes the time of use according to the climatic conditions and solar radiation. Different powers and mass flows are visualized in Figure 17c and Table 5.  
The results obtained according to Figure 18 show a comparison of the three different modes of use with respect to the real solar radiation. In variable mode, a usage time of 16.25 h is obtained. Mode 0 (economical) will maintain a time of use of 17.55 h, but at the lowest cooling power of 3 kW. Finally, Mode 5 (greater power) is maintained at a time of use of 14.86 h with the maximum cooling power of 5 kW. This mode is the one that has the least time of use.  
Figure 16: Mass flow of the generator and evaporator in Modes 0 and 5.  
Figure 15: Cooling capacity for Modes 0 and 5.  
Figure 17: Behavior of the variable mode of use of the cooling system defined by the end user. (**a**) Variable mode used. (**b**) kW of variable mode. (**c**) Mass flow for the generator and evaporator.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Time (h)** & **Mode** & **Power (kW)** & **Mass Flow \(\textit{in}_{g}\) (kg/s)** & **Mass Flow \(\textit{in}_{e}\) (kg/s)** \\ \hline
0 & 0 & 3.075–3.11 & 0.0347–0.035 & 0.0189–0.0191 \\
1.5 & 1 & 3.245–3.287 & 0.0365–0.037 & 0.0199–0.0202 \\
1.8 & 2 & 4.2388 & 0.0478 & 0.0261 \\
2.3 & 3 & 4.87–4.905 & 0.0549–0.0552 & 0.0299–0.0301 \\
4.9 & 5 & 4.87–4.905 & 0.0549–0.0552 & 0.0299–0.0301 \\
4.3 & 3 & 4.87–4.905 & 0.0549–0.0552 & 0.0299–0.0301 \\
4.9 & 2 & 4.2388 & 0.0478 & 0.0261 \\
5.8 & 1 & 3.245–3.287 & 0.0365–0.037 & 0.0199–0.0202 \\
6.8 & 0 & 3.075–3.11 & 0.0347–0.035 & 0.0189–0.0191 \\ \hline \hline \end{tabular}
\end{table}
Table 5: Different modes of operation varying in time for radiation of 900 kW/m\({}^{2}\).