Beschreibung:
The enthalpy–entropy approach was used to model the gas turbine (GT) actual cycle, which is the more rigorous and accurate method. A constructed GT C# programming language code was used to study ambient temperature (Tam), relative humidity (RH), and the ambient pressure (Pam) effects on the GT output parameters. The results of the GT modeling program showed that the maximum (minimum) difference in GT output power (PGT) was 1.12% (0.01%) at Tam of 39.7°C (23.3°C) compared with the actual output power. As Tam increased from 14°C to 40°C, the PGT decreased by 19.01% (18.38%) of GT nominal power (250 MW) at 15% (95%) RH, while GT thermal efficiency (ηth) decreased by 2.3058% (2.4431%) and the specific fuel consumption (SFC) increased by 7.12% (7.59%). The PGT reduced by 0.1497% and 0.7674%, respectively, through the RH increase from 15% to 95%. The PGT decreased by 0.03675 MW and 0.16835 MW, while the ηth decreased by 0.0047% and 0.0243% at Tam 15°C and 40°C, respectively, when the Pam decreased from 1.013 bar to 0.990 bar. The compressor isentropic efficiency is not affected by the bleeding air percent according to the used assumptions