Exergoeconomic Analysis and Modelling of LM2500+G4 Engine for Marine Propulsion and Cogeneration Application 2019-01-0903

The current global energy scenario demands for fuel efficient and cost effective thermal systems of energy conversion. It leads to investigation of techniques which can minimize the energy wastage and maximize the utilization of energy. In this regard the present paper proposes a configuration (LM2500+G4 marine engine manufactured by M/S GE Aviation for cogeneration application) for marine propulsion and cogeneration. The exhaust gas temperature of LM2500+G4 marine engine is around 800 K hence heat of this exhaust stream can be utilized to produce process steam for further use. In this particular work the aforesaid configuration has been exergoeconomically analyzed to predict the total cost rate (investment cost rate + fuel cost rate) of the system. The “Average Cost Theory” has been approached for the exergoeconomic analysis. The exergoeconomic analysis is the combined study of thermodynamic concepts and economic principles. Methodology utilizes the exergy concept of thermodynamics for cost assignment which is why it is called as “Exergoeconomic Analysis”. The present work deals with the thermodynamic performance prediction of proposed engine configuration as well as it also reveal the cost related data of the same. The results obtained from exergoeconomic analysis show that by generating steam in heat recovery steam generator the exergetic efficiency of cycle has been improved by 40%. The result of analysis also shows that investment cost flow rate ( Z. ), cost rate of fuel ( C.f ), total cost flow rate ( C.T ) and exergetic efficiency (ε) is being 0.2822 $/s, 0.3490 $/s, 0.6313 $/s and 53.90 % respectively.