## 3 Results
### Results of the AdvEx-Based Analyses
#### 3.2.2 Results of the AdvExEcon Analysis  
The conclusions of the TradExEcon analysis showed that both the cost related to exergy destruction and the cost related to capital investment should be taken into account. Therefore, the results of the AdvExEcon analysis for the cost associated with exergy destruction are given in Table 6. In the third and fourth columns of Table 6, 72% of the total exergy destruction cost of 510.6 USD/h is the endogenous part caused by the components themselves. The remaining 28% is exogenous. Therefore, the interaction between components can be considered to be weak. As seen in the table, the cost of endogenous exergy destruction is higher than the cost of exogenous exergy destruction in all equipment, except for pumps. Pumps are affected by the operation of other GPP components. Thus, exergy destruction in other components is reduced to reduce the exergy destruction costs of the pump. It may be suggested to replace existing components with more efficient or new technological ones to decrease exergy destruction costs. The highest endogenous exergy destruction cost is CON 1 with 47.5 USD/h. It is followed by CON 2 with 43.6 USD/h, VAP 2 with 20.2 USD/h, and PU 1 with 18.4 USD/h. Furthermore, the difference between endogenous and exogenous exergy destruction costs for this equipment is wide. The endogenous exergy destruction cost is higher due to reasons, such as the selection of condensers with low capacity at the beginning and then the polluting and blinding effect of the cooling water inside, which reduces the efficiency of the condenser. In this case, the pumps are more affected by pressure drops due to contamination and blinding in the condensers. Therefore, exogenous exergy destruction costs are higher than endogenous costs. As seen in the fifth and sixth columns of Table 6, the inevitable and preventable parts of the total exergy destruction cost are 281 USD/h and 220 USD/h, respectively. The value of the inevitable part is greater than the preventable part. Therefore, it has the potential to keep the plant and its components at a low level of efficiency. Except for condensers, preheaters, and VAP 1, the inevitable exergy destruction costs of all equipment are higher than the preventable exergy destruction costs. As can be understood from the table, CON 2 has the highest value with a preventable exergy destruction cost of about 51.1 USD/h. It is followed by CON 1 with 44.2 USD/h, PU 2 with 11.2 USD/h, and PU 1 with 7.5 USD/h. Therefore, these components have the highest improvement potential. The highest unpreventable exergy destruction costs are in the PUs (PUs 1 and 2 with 39.3 USD/h and 354 USD/h, respectively). The inevitable exergy destruction costs are higher than the avoidable exergydestruction costs of the main equipment TURBs 1 and 2 in the GPP. This means that these turbines require maintenance or replacement costs. The values of the endogenous and exogenous parts of the components within the unpreventable exergy destruction cost are given in columns 7 and 8 of Table 6. Here, 75% of the total inevitable exergy demolition cost of 281 USD/h is endogenous and 25% is exogenous. The highest inevitable exogenous exergy destruction cost is PU 2 at 27.8 USD/h. After that, it is PU 1 at 24.5 USD/h, CON 1 at 12.5 USD/h, and VAP 2 at 12 USD/h, respectively. In columns 9 and 10 of Table 6, the component exergy destruction cost of the preventable endogenous part is presented. All components except the pumps and RECUP from the table are preventable, and the preventable intrinsic exergy destruction costs are higher than the inner part. A total of 68% of the total preventable exergy demolition cost of 229.6 USD/h is endogenous and 32% is exogenous, which means that the system can be improved. The component with the highest preventable intrinsic exergy destruction cost is CON 1 with 43.7 USD/h. It is followed by CON 2 at 40.7 USD/h, VAP 2 at 8.5 USD/h, and PRE-HE at 4.1 USD/h.