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# Exergy Analysis and Performance Assessment for Different Recuperative Thermodynamic Cycles for Gas Turbine Applications

[+] Author and Article Information
Christina Salpingidou

Aristotle University of Thessaloniki Laboratory of Fluid Mechanics & Turbomachinery, Department of Mechanical Engineering, Building D, 9th Floor, Aristotle University Campus, 541 24, Thessaloniki, Greece
csalpingidou@eng.auth.gr

Dimitrios Misirlis

Technological Educational Institute (TEI) of Central Macedonia Terma Magnesias, Serres, 621 24, Greece
misirlis@eng.auth.gr

Zinon Vlahostergios

Aristotle University of Thessaloniki Laboratory of Fluid Mechanics & Turbomachinery, Department of Mechanical Engineering, Building D, 9th Floor, Aristotle University Campus, 541 24, Thessaloniki, Greece
zinonv@eng.auth.gr

Stefan Donnerhack

MTU Aero Engines AG Dachauer Strasse 665 Munich, Germany

Michael Flouros

MTU Aero Engines AG Dachauer Strasse 665 Munich, Germany
michael.flouros@mtu.de

Apostolos Goulas

Aristotle University of Thessaloniki Laboratory of Fluid Mechanics & Turbomachinery, Department of Mechanical Engineering, Building D, 9th Floor, Aristotle University Campus, 541 24, Thessaloniki, Greece
goulas@eng.auth.gr

Kyros Yakinthos

Aristotle University of Thessaloniki Laboratory of Fluid Mechanics & Turbomachinery, Department of Mechanical Engineering, Building D, 9th Floor, Aristotle University Campus, 541 24, Thessaloniki, Greece
kyak@auth.gr

1Corresponding author.

ASME doi:10.1115/1.4038362 History: Received July 11, 2017; Revised August 30, 2017

## Abstract

This work presents an exergy analysis and performance assessment of three recuperative thermodynamic cycles for gas turbine applications. The first configuration is the conventional recuperative cycle in which a heat exchanger is placed after the power turbine. In the second configuration, referred as alternative recuperative cycle, a heat exchanger is placed between the high pressure and the power turbine, while in the third configuration, referred as staged heat recovery cycle, two heat exchangers are employed, the primary one between the high and power turbines and the secondary at the exhaust, downstream the power turbine. The first part of this work is focused on a detailed exergetic analysis on conceptual gas turbine cycles for a wide range of heat exchanger performance parameters. The second part focuses on the implementation of recuperative cycles in aero engines, focused on the MTU-developed Intercooled Recuperative Aero (IRA) engine concept, which is based on a conventional recuperation approach. Exergy analysis is applied on specifically developed IRA engine derivatives using both alternative and staged heat recovery recuperation concepts to quantify energy exploitation and exergy destruction per cycle and component, showing the amount of exergy that is left unexploited, which should be targeted in future optimization actions.

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