Exergy Analysis for A Two-Stage Turbine

Author : Zaid H. Yaseen

Abstract :Exergy can be defined as the maximum theoretical work that can be acquired when a system is brought to equilibrium with a reference state, typically: the environment or the surroundings. In this work, exergy analysis for a two-stage turbine is studied and presented. Steam enters the first stage of the turbine at 8 MPa and 500 °C; then, it leaves this stage at 2 MPa and 350 °C. Heat is added to the steam between the stages at a constant pressure so that it enters the second stage of the turbine at 2 MPa and 500 °C. Steam leaves the second stage of the turbine at 30 kPa and a quality of 97%. Results showed that by increasing the turbine’s inlet pressure, the rate of exergy destruction within the turbine increased. Hence, the second law efficiency of the turbine decreased. In fact, a second law efficiency was found to be 91.62 % when the inlet pressure for the turbine was 8 MPa; however, the second law efficiency decreased to 86.36 % when turbine’s inlet pressure increased to 12 MPa. This demonstrates that by increasing the inlet pressure for the first stage, the reversible power output increases within the turbine

Keywords :Exergy, Turbine, Second Law Efficiency, Reversible Power Output.

Conference Name :International Conference on Renewable Energy and Sustainable Energy Management ICRESEM |25

Conference Place Dammam, Saudi Arabia

Conference Date 10th May 2025