Exergy analysis of a natural gas fuelled gas turbine based cogeneration cycle

In this paper, the monthly-based annual performance of a natural gas fuelled gas turbine-based cogeneration cycle was analysed. The performance analysis of the system was investigated in three steps. First, the real system parameters like temperature, pressure and power production were measured during a year. The measured parameters were compared with theoretical calculations. After which exergy-based annual analysis of the system was performed for both system components and the overall system. Finally, the exergy analysis of the maximum and minimum power generated months (December and February) was compared with each other to show differences between the endpoints. As a result of the study, during the year, the maximum thermal and exergy efficiency of the simple gas turbine was calculated as 36.45% and 50.50% for the real case and 43.82% and 60.70% for the theoretical case, respectively. Moreover, the maximum thermal and exergy efficiency of the cogeneration system was determined as 79.00% and 94.19% for the real case and 83.92% and 91.64% for the theoretical case.