## 3 Results
The exergy efficiency for isentropic fluid is illustrated in Figure 8. The following can be seen in the figure:  
* If the turbine inlet temperature is above 160 \({}^{\circ}\)C, the highest exergy efficiency among isentropic fluids is obtained from R141b;
* For a turbine inlet temperature of 200 \({}^{\circ}\)C, the exergy efficiency of the R141b fluid is calculated to be 50%;
* If the turbine inlet temperature is below 160 \({}^{\circ}\)C, the highest exergy efficiency among isentropic fluids is obtained from R123;
* For a turbine inlet temperature of 160 \({}^{\circ}\)C, the exergy efficiency of the R123 fluid is calculated to be 50%. The net power and irreversibility for a simple RC with dry fluid are illustrated in Figure 9. The following can be seen in the figure:  
* The highest net power among dry fluids above a turbine inlet temperature of 200 \({}^{\circ}\)C is obtained from toluene;
* For a turbine inlet temperature of 300 \({}^{\circ}\)C, the net power obtained from the toluene is calculated to be 201.094 kW;  
Figure 6: Exergy efficiency for dry fluids. Figure 5.0 Exergy efficiency for wet fluids. * If the turbine inlet temperature is below 200 \({}^{\circ}\)C, the highest net power among dry fluids is obtained from n-hexane;
* For a turbine inlet temperature of 200 \({}^{\circ}\)C, the net power obtained from the n-hexane is calculated to be 193.93 kW;
* Additionally, Figure 9 shows that irreversibility and net power are inversely proportional. Irreversibility decreases as net power increases. The net power and irreversibility for a dry fluid in RC with a recuperator are illustrated in Figure 5.1 The following can be seen in the figure:  
* The highest net power among dry fluids with a turbine inlet temperature above 200 \({}^{\circ}\)C is obtained from toluene;
* For a turbine inlet temperature of 300 \({}^{\circ}\)C, the net power obtained from the toluene fluid is calculated to be 215.512 kW;
* If the turbine inlet temperature is below 200 \({}^{\circ}\)C, the highest net power among dry fluids is obtained from n-hexane;
* For a turbine inlet temperature of 200 \({}^{\circ}\)C, the net power obtained from the n-hexane is calculated to be 207.894 kW;
* Additionally, as shown in Figure 10, irreversibility and net power are inversely proportional. Irreversibility decreases as net power increases. Figure 5.2 Exergy efficiency for isentropic fluids. Figure 5.3 Net power and irreversibility for dry fluids with simple ORC. The net power and irreversibility for a wet fluid in RC are illustrated in Figure 5.4 The following can be seen in the figure:  
* In simple RC systems, the net power of R718 is calculated to be higher than that of R717 at each temperature. The net power and irreversibility of an isentropic fluid in a simple RC are illustrated in Figure 5.5 The following can be seen in the figure:  
* For turbine inlet temperatures above 160 \({}^{\circ}\)C, the highest net power among isentropic fluids is obtained from R141b;
* In cases where the turbine inlet temperature is below 130 \({}^{\circ}\)C, the highest net power is obtained from R123. The proposed system design, with waste heat of diesel engine onboard ships enables not only improved energy efficiency, fuel savings, reduction in greenhouse gas emissions, and compliance with environmental regulations but also economic competitiveness, promoting technological innovation, increased operational flexibility, broader impact, contribution to the circular economy, potential for retrofitting existing fleets, and stimulating job creation and industry growth. Figure 5.6 Net power and irreversibility for wet fluids. Figure 5.7 Net power and irreversibility for dry fluids of RC with recuperator.