Exergetic and Thermodynamic Analysis of Several Combinations of Gas Turbine Cycles with Multiple Effect Evaporation Desalination

In this study, three kinds of gas turbine cycles coupled with multi effect evaporation thermal vapor compression desalination (METVC) are investigated. The first system is a simple cycle gas turbine (without steam injection). In the second and third system, a cycle gas turbine with steam injection into the combustion chamber (STIIC) and a gas turbine with steam injection before the combustion chamber (STIBC) are considered, respectively. At the first, design parameters such as compressor pressure ratio, the temperature of combustion product and pressure of motive steam was fixed and the performance of these three models are evaluated. Then, using a developed computational code, the effect of these parameters on exergy efficiency, output power, exergy destruction and important parameters of fresh water and power production are studied. The results show that exergy efficiency for models with steam injection increased 4% compared to the model without steam injection. In addition, for STIIC and STIBC, the rate of irreversibilities will reduce to 80.22 and 81.26 MW where this parameter is 82.72 MW for without steam injection model.