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

Abstract

In this paper, a trigeneration system was analyzed using an advanced exergy analysis. The trigenerationsystem is located in the Eskisehir Industry Estate Zone in Turkey. The exergy efficiency of the system is0.354, and the total exergy destruction of the system is 16.695 MW. The total exergoeconomic factor ofthe system is 0.069, and unit electricity generating cost is 56.249 $/GJ. The exergy destruction and in-vestment cost rates within the facility’s components are generally divided into four parts: endogenous,exogenous, avoidable and unavoidable exergy destruction. Through this analysis, the improvement po-tential of the costs of the components and the investment and the overall system were determined alongwith the economic relationships between the components. The results of the analysis indicate that thecombustion chamber, high pressure steam turbine and condenser exhibit significant economicimprovement potential because of their high exergy destruction costs. Similarly, the heat recovery steamgenerator and condenser exhibit significant potential to reduce their investment costs. In addition,suggestions for improving system economical parameters are provided.