Thermodynamic Analysis of a Combined Gas Turbine ORC Using Some Organic Fluids

Abstract

The increase in energy and environmental problems has led us to use sustainable methods for the optimization of energy systems. In this study, an integrated Organic Rankine Cycle (ORC) has been added to the waste heat of a cascade expansion gas turbine in the name of innovative concepts in industrial competition. In this ORC system, mass flow rates, pressure ratios, net powers and thermodynamic calculations of five different fluids (R123, R245fa, R600, R365mfc and R113) were made by operating them with a certain heat load. Accordingly, the ORC net powers of the refrigerants were found to be 15.54kW for R123, 14.78kW for R245fa, 14.71kW for R600, 14.78kW for R365mfc and 15.45kW for R113. With the net power of 51.4kW from the gas turbine, the net power obtained with the R123 refrigerant used in the ORC system is added to 15.54 kW and it has been calculated that it provides a total net power of 66.94kW. The energy efficiency of the designed integrated system was calculated as 66% and the exergy efficiency as 20%. It is seen that the importance of sustainable energy in the optimization of power systems combined with ORC is inevitable.