Second-Law Efficiency Analysis of Gas-Turbine Engine for Cogeneration


To make the best use of our available energy resources, exergy analysis was conducted to determine the second-law efficiency for a modified GM 501K gas-turbine engine operating on a Cheng cycle. Based on the measured data for power generation, high temperature gas was bled from the exit of the gas-generator turbine to a heat exchanger for heating additional water as cogenerated processing steam. Considering the energy content and the exergy of the processed steam together with the power generation as the desired products, the Cheng cycle can be operated in a wide range of power and processing steam cogeneration. The first-law efficiency was found to be between 30% to 39% and the second-law efficiency between 49% and 63% when the power delivery varies between 26% and 100%.

Meeting Name

8th Congress & Exposition on Gas Turbines in Cogeneration and Utility, Industrial and Independent Power Generation


Mechanical and Aerospace Engineering

Keywords and Phrases

Cogeneration Plants; Efficiency; Energy Management; Energy Resources; Exhaust Gases; Heat Exchangers; Steam Generators; Thermodynamics

Document Type

Article - Conference proceedings

Document Version


File Type





© 1994 American Society of Mechanical Engineers (ASME), All rights reserved.

Publication Date

01 Jan 1994

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