## 4 Discussion
For AdvExEcon analysis, their values are reduced to 39% and 56%, respectively. It shows that the exergy in these components should be improved by reducing the cost of demolition. After these components comes TURB 2 with \(r_{k}\) values of 164%, followed by VAP 2 with 99%. However, with further analysis, the \(r_{k}\) values are 7% for TURB 2 and 11% for VAP 2. For AdvExEcon analysis, the highest \(r_{k}\) values among the components belong to PU 2 with 56%. It is followed by CON 2 with 50%, PU 1 with 39%, and CON 1 with 37%. The exergoeconomic factor (\(f_{k}\)) relates to the ratio of capital investment cost to total operating cost. In Figure 4, the variation in the exergoeconomic factor for the system and components for both analyses is given. As seen in Figure 3, the exergoeconomic factor in Figure 4 takes low values in contrast to the high values of the relative cost difference. This ensures the efficiency of the component by reducing the cost of exergy destruction. The \(f_{k}\) value of the plant is calculated as 58% for the TradExEcon analysis and 16% for the further analysis. The capital investment cost of the PP is considered to be higher than the cost of exergy destruction. In the AdvExEcon analysis, the \(f_{k}\) value decreases with the preventable part of the exergy destruction cost caused by the components. Therefore, if the efficiency  
Figure 3: Change in relative cost difference for the components for both analyses. Figure 2: Change in total operating cost for the components for both analyses. of the equipment is increased, it is understood that the decrease in the investment cost is justified. As seen in Figure 4, the highest exergoeconomic factor in the TradExEcon analysis is TURB 1 with 92%. It is followed by TURB 2 with 88%, VAP 1 with 77%, PRE-HE 1 with 73%, and CON 1 with 68%. With the AdvExEcon analysis, the exergoeconomic factor of all components falls below 50%. Therefore, the exergy destruction costs of the components become important. The largest exergoeconomic factor decrease occurs in PRE-HE 1, CON 2, and PRE-HE 2. Investment cost ratios within the total operating cost of all equipment are reduced. Cost performance trend (_e_), which is defined as the ratio of fuel exergy cost to production exergy cost, is presented in Figure 5 for both analyses. While the value of e is 0.45 times in the TradExEcon analysis, its value is 0.37 times in the enhanced exergy analysis. This result is due to a reduction in the fuel exergy cost. As shown in Figure 5, the _\"e\"_ values of all components increase with further analysis. For the equipment with the highest e value, TURB 2 has a value of 2.2 times in the TradExEcon analysis, while its value in the AdvExEcon analysis decreases to 2 times. The biggest difference occurs in the pumps. Due to the high exergy destruction cost in the context of Figure 4, the change in the exergy destruction cost ratio (y\({}_{k}\)) is presented in Figure 6 for the system and components. The load of the whole system is calculated as 407% for the TradExEcon analysis and 125% for the AdvExEcon analysis. The exergy destruction cost in the total fuel exergy cost is reduced. A similar situation occurs within the components. As seen in Figure 6, condensers (CONs 2 and 1) and pumps (PUs 1 and 2) are the components that will make the highest contribution to the cost performance of the system. While the load value of PU 2 is 37% for the traditional analysis, it is 3% for the enhanced analysis. This contribution is obvious here. When comparing the results of both methods, Figure 7 shows the change (\(X_{w}\)) in the total operating cost per total electricity generation for the plant and its components. As seen in Figure 7, the total X\({}_{w}\) value of the system is 0.058 USD/kWh and 0.049 USD/kWh for the TradExEcon and AdvExEcon analyses, respectively. With the application of the AdvExEcon analysis, there is a 15% reduction in the total operating cost of the PP. This is a result of the preventable portion of exergy demolition costs arising from the components.