Performance comparison of direct and indirect hybrid systems of gas turbine and solid oxide fuel cell from thermodynamic and exergy viewpoints

The aim of this article is to compare a direct hybrid system of gas turbine and solid oxide fuel cell with an indirect system from thermodynamic and exergy viewpoints. According to importance of fuel cell role in hybrid cycles and providing further proportion of produced power، discrete and complete thermodynamic، electrochemical and thermal analyses have been done. Calculation of working temperature which has an impact on system performance is one of the most significant works that is done in this article. In addition، by parametric study of this hybrid system، the influence of inlet air rate and compression ratio on efficiency، power and exergy destruction rate has been perused and eventually an optimized state for system will be offered. Results indicate that a direct hybrid system is more efficient in comparison with an indirect system. Higher efficiency، less irreversibility، higher power، and less pollution are the most important advantages of direct hybrid systems.