## 3 Results and Discussions
### Sensitivity Analysis
Figure 4: Effect of the evaporator and condenser pinch point on (**a**,**d**) \(\Delta\)BSFC, (**b**,**e**) Wcomb, and (**c**,**f**) exergetic efficiency using toluene, acetone, and cyclohexane as working fluid. 2.2 Effect of Turbine, Pump, Pinch Condenser, and Evaporator Efficiency on Cost of Exergy Destroyed by Component  
The effect that study variables have on the cost of destroyed exergy in each of the system components is shown in Figure 5. Pump efficiency continues to be a study variable that does not significantly affect system indicators. In this case, Figure 5a-c shows a constant trend in the variation of destroyed energy costs of system components as pump efficiency increases. It is also observed that the component with the highest values of the destroyed exergy cost is the condenser, recording values in the range of \(3.90\times 10^{-3}\) USD/kWh when the system worked with toluene \(1.93\times 10^{-3}\) USD/kWh for acetone and \(8.08\times 10^{-3}\) USD/kWh for cyclohexane; while the other components do not vary drastically and remain approximately within the same output ranges when compared to other fluids. However, the pumps do represent a reduction in the cost of exergy destruction, which was in the range of 33.30% for the thermal oil pump (B1), and 83.33% for the organic fluid pump (B2), when all three working fluids were used as the isentropic efficiency of the pump increased within the evaluated range. The opposite happens with the increase of the efficiency of the turbine, which results in a significant decrease in the cost of destroyed exergy for the condenser and the turbine. The condenser has a 40.95% and 86.78% reduction for the turbine when toluene is used as the working fluid. In addition, the condenser is reduced by 37.88% and the turbine by 86.83% using acetone. Finally, when working with cyclohexane, the cost of destroyed exergy is reduced by 33.88% in the condenser and 87.13% in the turbine, while for the other components the variation was less, whose decreases do not exceed 22%. Figure 6 shows the influence of the evaporator pinch and condenser pinch on the costs of exergies destroyed by components. As for the pinch condenser, Figure 6a-c reveals that the increase of the temperature pinch of the condenser causes decreases of 32.60% (toluene), 25.33% (acetone), and 37.35% (cyclohexane) in the cost of destruction of exergy in the condenser. The opposite case occurs in the cost of exergy destruction in the evaporator, which increases by 42.97% (toluene), 12.93% (acetone), and 32.08% (cyclohexane). Similar behavior is found in pump 2 (B2), which records increases in the cost of destroyed exergy of 29.69% (toluene), 30.34% (acetone), and 30.89% (cyclohexane). Figure 5: Effect of turbine and pump efficiency on the cost of exergy destroyed by component using as organic working fluids (**a,d**) toluene, (**b,e**) acetone, (**c,f**) cyclohexane. The equipment that was least affected by the variation of the pinch condenser was the turbine whose increase did not exceed 1.3% in the three cases. The other components showed slight increases that did not exceed 15% when working with toluene, acetone, and cyclohexane. On the other hand, as far as the effect of the increase in the evaporator pinch is concerned, Figure 6d-f shows an increase in the costs of destroying the exergy of the components with the exception of the organic fluid pump (B2), which was the only one to show a slight decrease below 4% in the three cases, due to the increase in the evaporator pinch temperature.