Thermodynamic Analysis and Parametric Study of a Cogeneration System Through Combination of a Gas Turbine with Kalina Cycle

A thermodynamic analysis of a novel combined cycle which is combination of methane fired gas turbine cogeneration system (CGAM) with a Kalina cycle system (KCS) is reported In order to waste heat recovery. With the aim of detect irreversibility distribution in the cycle, exergy destructions and exergy efficiencies are calculated for components. Finally, a comprehensive parametric study is performed to investigate the effects of some important parameters i.e. air compressor pressure ratio, air compressor and gas turbine isentropic efficiency, maximum pressure of Kalina cycle and ammonia concentration of working fluid on energy and exergy performance of the proposed system. The results showed that, the cycle efficiency is maximized at a particular air compressor pressure ratio and its value depends on several operating parameters of the system. Maximum energy and exergy efficiencies are determined to be 85.8% and 52.5%, respectively, for the proposed system in air compressor pressure ratio of 15.26. The maximum net output power of Kalina cycle is 940 kW which occures in 45 bar and increase of ammonia concentration leads to net output power increasing.