Title: Thermodynamic evaluation of gas turbines for cogeneration applications

Authors: A. Khaliq, K. Choudhary

Addresses: Faculty of Engineering and Technology, Department of Mechanical Engineering, Jamia Millia Islamia, New Delhi 110 025, India. ' Mechanical and Automation Engineering Department, Amity School of Engineering and Technology, GGSIPU, New Delhi 110 061, India

Abstract: In this paper, the first and second laws of thermodynamics have been utilised to evaluate the performance of intercooled reheat regenerative gas turbine cogeneration plant. The effects of overall pressure ratio, cycle temperature ratio, pressure losses, and process steam pressure on energetic and exergetic efficiencies have been investigated. The results indicate that most of the exergy destructions occur in the Combustion Chamber, which represent about 70% of total exergy destruction in the overall system. The compressor and gas turbine losses are shown to have a relatively small influence on system performance parameters. Energetic efficiencies decrease with increase in process steam pressure, but the exergetic efficiency is constant with the same.

Keywords: energy; exergy; cogeneration systems; intercooling; reheat; regeneration; thermodynamic evaluation; gas turbines; laws of thermodynamics; pressure ratio; cycle temperature ratio; pressure losses; process steam pressure; combustion chamber.

DOI: 10.1504/IJEX.2009.023342

International Journal of Exergy, 2009 Vol.6 No.1, pp.15 - 33

Published online: 19 Feb 2009 *

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