## 5 Conclusions  
In this paper, the benefit offered by developed traditional and advanced exergetic analysis in GPP and SGPP systems was shown, in particular in the organic Rankine cycle systems. Exergetic analysis allows the determination of the sources of irreversibility in a thermal system, and therefore indicates the starting points of an optimization procedure and contributes to the rational use of the energetic resources. In the study carried out, it was possible to determine which equipment resulted in a greater destruction of exergy introduced in the GPP and SGPP systems based on the organic Rankine cycle. The equipment in which the design or operational improvements can be made was also determined, since the implementation of some recommendations is not practical for optimizing the cycle due to operational or design limitations. Therefore, traditional exergy, advanced exergy, exergo-economic and exergo- environmental analyses were applied to gain a better understanding of the system performance. Moreover, a comprehensive comparison was conducted to further assess the system from various points of view. The conventional exergy in the GPP cycle showed that the ORC condenser had the largest exergy destruction and highest investment costs (USD.s\({}^{-1}\) 950.16 kW and 7.21E-04). Additionally, the maximum cost of exergy destruction and highest exergo-environmental destruction is associated with the ORC turbine (USD.s\({}^{-1}\) 0.0017) and 6.11E-07 (pts.S\({}^{-1}\)). In the SGPP cycle, the solar power plant had the largest exergy destruction and highest investment costs (USD.s\({}^{-1}\) 6.4E+03 kW and 2.41E-02). Additionally, the maximum cost of exergy destruction and highest exergy-environmental destruction is associated with the steam evaporator (USD.s\({}^{-1}\) 4.41E-03) and 3.73E-06 (pts.S\({}^{-1}\))).The results of the energetic and exergetic analysis of the system showed that the exergy destroyed is a measure of the degree of process irreversibility. Thus, in the case of the ORC condenser, the causes of the irreversibility were due to the heat transfer through a finite temperature difference higher than 100 oC; that is, a smaller exergy efficiency implies greater exergy destruction in the system components. Additionally, the highest exergo-economic factor was found in the ORC turbine and ORC pump, with 75.89% and 60.97%, respectively. These results were a consequence of the high effect of the purchased equipment cost, and the low thermodynamic efficiency in the aforementioned devices, where the probable solution could be the implementation of low-cost components, which are usually characterized by a lower energy efficiency. Most of the exergy destruction in the GPP cycle calculated was endogenous (78.53%), emphasizing that the interaction between components does not have a significant effect on the overall exergetic performance of the cycle. The maximum unavoidable exergy in the GPP cycle was found for the ORC evaporator, with 91.68%. This indicates that there are not many ways to improve this component. Nevertheless, other components, such as the ORC pump and ORC recuperator, have the minimum unavoidable exergy destruction, with 50.91 and 124.39 kW. The maximum unavoidable exergy in the SGPP cycle was found for the ORC evaporator, with 91.52%. This indicates that there are not many ways to improve this component. Nevertheless, other components, such as the coupling pump, HTF pump and steam pump, have the minimum unavoidable exergy destruction, with 0.08, 1.81 and 1.98 kW, respectively. In addition, the component with the highest cost destruction rate in the GPP cycle was the ORC turbine with USD.S\({}^{-1}\) 0.0032, followed by the ORC evaporator with USD.S\({}^{-1}\) 2.3, but the highest avoidable cost rate was found for the ORC evaporator with a value of USD.S\({}^{-1}\) 2.87E-04. On the other hand, the advanced exergo-economic analyses in the SGPP cycle showed that the steam evaporator is the component with the major purchase equipment cost in the system, with a value of USD.S\({}^{-1}\) 4.4E-03.