## 4 Results and Discussion
### Systems' productivities  
The influences of operating parameters (\(\Delta\text{t}_{\text{sup}}\), \(\text{tf1}\), \(\text{tw1}\), and \(\text{MR}\)) on the systems' productivities; electrical power generation, freshwater productivity (\(\dot{m}_{fresh}\)), space cooling capacity (\(\dot{Q}_{cooling}\)), domestic heating capacity (\(\dot{Q}_{heating}\)), of the proposed multi-generation systems (MGS-I and MGS-II) are presented in Table 4 and Figures 3 and 4. Table 4 and Figures 3a and 4b,d demonstrate the effect of the superheat degree, \(\Delta\text{t}_{\text{sup}}\), on the \(\dot{W}_{net}\), \(\dot{m}_{fresh}\), \(\dot{Q}_{cooling}\) and \(\dot{Q}_{heating}\) at \(\text{tf1}\) = 50 \({}^{\circ}\)C, \(\text{tw1}\) = 20 \({}^{\circ}\)C, and \(\text{MR}\) = 0.25. As shown in Figure 3a, Figure 4b and Table 4, the values of \(\dot{W}_{net}\), \(\dot{Q}_{cooling}\), \(\dot{m}_{fresh}\), and \(\dot{Q}_{heating}\) improve with increasing \(\Delta\text{t}_{\text{sup}}\). Such a trend is the same for the proposed systems (MGS-I and MGS-II). This is attributed to the increase in turbine work, solar energy needed, and the heat liberated at the ORC condenser as the turbine inlet temperature increases. This reflects the increase in the needed area of solar collectors, air humidification capacity inside the humidifier, space cooling capacity, and domestic heating capacity. Moreover, Table 4 displays the effect of tf1 on the systems' productivities at \(\Delta\)tsup = 45 \({}^{\circ}\)C, t\({}_{\rm w1}\) = 20 \({}^{\circ}\)C, and MR = 0.25. The condensing temperature of ORC harms the \(\dot{W}_{net}\), \(\dot{m}_{fresh}\), \(\dot{Q}_{cooling}\). Such a trend is similar for MGS-I and MGS-II. Increasing the condensation temperature reduces the turbine power due to the reduction in enthalpy difference across the turbine, which also results in a decreasing freshwater rate. This is a result of reducing the heat recovered from the condenser to water and air streams before entering the humidifier, which reduces the amount of water evaporation and consequently reduces the dehumidifier capacity. In addition, increasing the condenser pressure reduces the regeneration temperature of DCS, which, in turn, causes a reduction in space cooling capacity. Furthermore, Figure 3b and Table 4 show that increasing tw1 has an adverse and negligible effect on \(\dot{m}_{fresh}\) and \(\dot{W}_{net}\), respectively. Decreasing \(\dot{m}_{fresh}\) is due to decreasing the air dehumidification capacity through the dehumidifier, which leads to a lower freshwater production rate. Nevertheless, the increase in water inlet temperature has no impact on \(\dot{W}_{net}\) (see Table 4). This is because of the independence of the ORC heat supply and liberated to the seawater inlet temperature. Figures 3c and 4a,c and Table 4 show the effects of MR on the \(\dot{W}_{net}\), \(\dot{m}_{fresh}\), \(\dot{Q}_{cooling}\), and \(\dot{Q}_{heating}\). Increasing MR has adverse impacts on \(\dot{m}_{fresh}\) and \(\dot{Q}_{heating}\) due to the decrease in evaporation rate in the humidifier due to reducing the seawater flow rate with increasing MR. This results in a lower freshwater yield and domestic heating capacity. Figure 4a displays the increase of \(\dot{Q}_{cooling}\) with increasing MR until it attains a maximum value and then starts to drop with increasing MR. Increasing MR has two opposing effects: it reduces air flow rate and increases the enthalpy difference across the conditioned space. In the first interval of MR, the increase in enthalpy difference across the space dominates the reduction in air mass flow rate, which leads to improved \(\dot{Q}_{cooling}\) and vice versa in the second interval of MR. Table 4 also shows that MR does not affect on \(\dot{W}_{net}\) and that this is because the ORC heat source and rejected heat are independent of MR. Comparing the proposed multi-generation systems (MGS-I and MGS-II), Figure 4a-c shows that the freshwater productivity of the MGS-II system is higher than that of the MGS-I system.