THERMODYNAMIC ANALYSIS OF RECUPERATED GAS TURBINE COGENERATION CYCLES

Cogeneration cycles have better advantages over the conventional cycles. In this study, the performances of the recuperated cogeneration cycles are analyzed. For the calculation of the enthalpy and the entropy values of the streams, a computer program written by the author in FORTRAN codes is used. Exergy analysis is done for the air-fuel preheated cogeneration cycle. The results present that by changing the compression rate from 6 to 16, the electric power increases about 20-40 %, but the heat power decreases about 10-30 % for the air-fuel preheated cycle. The decrease of the heat power is about 20-40 % for the air-fuel preheated cycle at compression rate 6 by changing excess air rate from 1.3 to 3.5. Increasing compression ratio increases the exergetic efficiency for the cycle. For the air-fuel preheated cycle increasing excess air rates increases the exergetic efficiency.