Advanced exergoeconomic analysis of a trigeneration system using a diesel-gas engine

In this paper, a trigeneration system was analyzed using an advanced exergy analysis. The trigeneration system is located in the Eskisehir Industry Estate Zone in Turkey. The exergy efficiency of the system is 0.354, and the total exergy destruction of the system is 16.695 MW. The total exergoeconomic factor of the system is 0.069, and unit electricity generating cost is 56.249 $/GJ. The exergy destruction and investment cost rates within the facilityʹs components are generally divided into four parts: endogenous, exogenous, avoidable and unavoidable exergy destruction. Through this analysis, the improvement potential of the costs of the components and the investment and the overall system were determined along with the economic relationships between the components. The results of the analysis indicate that the combustion chamber, high pressure steam turbine and condenser exhibit significant economic improvement potential because of their high exergy destruction costs. Similarly, the heat recovery steam generator and condenser exhibit significant potential to reduce their investment costs. In addition, suggestions for improving system economical parameters are provided.