Title: Ecological coefficient of performance analysis and optimisation of gas turbines by using exergy analysis approach

Authors: Yasin Ust; Bahri Sahin; Mehmet Cakir

Addresses: Department of Naval Architecture and Marine Engineering, Yildiz Technical University, Besiktas, 34349, Istanbul, Turkey ' Department of Naval Architecture and Marine Engineering, Yildiz Technical University, Besiktas, 34349, Istanbul, Turkey ' Department of Marine Engineering Operations, Yildiz Technical University, Besiktas, 34349, Istanbul, Turkey

Abstract: In this paper, a performance optimisation based on the exergetic/ecological coefficient of performance (ECOP) criterion has been performed for an irreversible simple, regenerative and cogeneration gas turbine systems by using exergy analysis method. The ECOP objective function defined as the ratio of exergy output to the loss rate of availability (or total exergy destruction). The obtained results were matched against those obtained using the power output and exergy efficiency. The design parameters under the optimal conditions have been derived numerically and their effects on the engine's performance have been discussed. The effect of the design parameters such as pressure ratio of compressor, cycle temperature ratio, isentropic efficiencies of turbine and compressor, effectiveness of the regenerator and pinch point temperature difference have also been investigated. The results obtained from this paper will provide guidance for the design of simple, regenerative and cogeneration gas turbine systems and can be used for selection of optimal design parameters.

Keywords: exergetic performance; gas turbines; regenerative; irreversibilities; cogeneration; optimisation; ecological CoP; coefficient of performance; exergy analysis; exergy destruction; power output; exergy efficiency; turbine design; optimal design; compressor pressure ratio; cycle temperature ratio; isentropic efficiencies; regenerator effectiveness; pinch point temperature difference.

DOI: 10.1504/IJEX.2016.078510

International Journal of Exergy, 2016 Vol.21 No.1, pp.39 - 69

Received: 08 Mar 2015
Accepted: 27 Dec 2015
Published online: 22 Aug 2016 *

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