Title: An appraisal method of exergy cost minimisation for co-generation systems

Authors: Katsumi Sugimoto, Terushige Fujii, Junichi Ohta

Addresses: Faculty of Engineering, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe shi 657-8501, Kobe, Japan. ' Faculty of Engineering, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe shi 657-8501, Kobe, Japan. ' Faculty of Engineering, University of Fukui, 3-9-1 Bunkyou, Fukui shi, 910-8507, Japan

Abstract: This study introduces an exergy cost-minimisation appraisal method for a simple gas turbine co-generation system. Optimisation of a gas turbine co-generation system of the electric output class of 17 MW is examined for a variety of turbine inlet temperatures of 950–1,300°C. An optimum value of the turbine inlet temperature exists for exergy cost minimisation and is estimated to be 1,200°C since the manufacturing price of the gas turbine increases greatly above 1,300°C. This fact shows that the rising manufacturing cost of the gas turbine constitutes an important effect for future development of higher temperature systems.

Keywords: gas turbine cogeneration systems; exergetic cost minimisation; exergy; thermal efficiencies; optimisation; turbine inlet temperatures; high temperature systems; cost appraisal.

DOI: 10.1504/IJEX.2006.009781

International Journal of Exergy, 2006 Vol.3 No.3, pp.255 - 271

Published online: 10 May 2006 *

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