Specific Entropy Generation in a Gas Turbine Power Cycle

[+] Author and Article Information
Yousef Haseli

School of Engineering and Technology, Central Michigan University, Mount Pleasant, MI 48858

1Corresponding author.

ASME doi:10.1115/1.4037902 History: Received July 12, 2017; Revised August 28, 2017


Numerous studies have shown that minimization of entropy generation does not always lead to an optimum performance in energy conversion systems. The equivalence between minimum entropy generation and maximum power output or maximum thermal efficiency in an irreversible power cycle occurs subject to certain design constraints. This article introduces specific entropy generation defined as the total entropy generated due to the operation of a power cycle per unit consumption of fuel. Through a detailed thermodynamic modeling of a gas turbine cycle, it is shown that the specific entropy generation correlates unconditionally with the thermal efficiency of the cycle. The maximum thermal efficiency is found to coincide with the minimum specific entropy generation. The results are presented for five different fuels including methane, hydrogen, propane, methanol and ethanol. Under identical operating conditions, the thermal efficiency is found to be approximately the same for all five fuels. However, the power cycle that burns a fuel with a higher heating value produces a higher specific entropy generation.

Copyright (c) 2017 by ASME
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