Varia, NitinPatel, DipalReddy, BaleSrinivas, Tangellapalli2018-11-072018-11-07May-18978-1-77355-023-7http://hdl.handle.net/10315/35312http://dx.doi.org/10.25071/10315/35312In the present work, combined cycle power generation configuration studies with natural gas as a primary fuel. Steam is injected in main combustion chamber and reheat combustion chamber individually and simultaneously to understand the performance of combined cycle work output and greenhouse gas emissions. The effect of pressure ratio, gas turbine inlet temperature on combined cycle work output, thermal efficiency and exergy efficiency carried out with and without steam injection. It is observed that the steam injection increases gas cycle efficiency and decreases the steam cycle efficiency. Ideal pressure ratio found to be 25 in all different combined cycle power generation system configurations. Maximum CO2 emission reduction (7.2%) occurs when steam injected in reheater combustion chamber.enThe copyright for the paper content remains with the author.Advanced Energy SystemsCombined cycleSteamTurbinesEnergy efficiencyExergy efficiencyArticle