Title: Influence of environmental temperature on exergetic parameters of a combined cycle power plant

Authors: Ümit Ünver; Muhsin Kılıç

Addresses: Faculty of Engineering, Energy Systems Engineering Department, University of Yalova, Yalova, 77100, Turkey ' Faculty of Engineering and Architecture, Department of Mechanical Engineering, Uludag University, Bursa, 16059, Turkey

Abstract: Ambient conditions have significant effect on combined cycle power plants (CCPPs). Parameters-like efficiencies, fuel consumption, power production and even operation cost differ according to the ambient conditions that depend on the climate that cannot be changed. Therefore, deciding the location of the plant wisely would bring more efficient and profitable. In this paper, exergy analysis based on the second law of thermodynamics, considering environmental temperature variations, are performed for a cogeneration power plant. Mathematical model of analyse is introduced. Magnitudes of the variation of irreversibility, reversible power, power production and specific fuel consumption (SFC) are evaluated for the combined cycle. The results indicated that, decrease of environmental temperature augments the energy performance of the combined cycle form about 53% to 56% and improves the exergetic performance from about 51% to 56%. However, the augmentation via temperature decrease is not continuous. It is shown that the environmental temperature decrease causes a reduction about 5% in the SFC.

Keywords: exergy analysis; combined cycle power plants; availability; gas turbine efficiency; steam turbine efficiency; environmental temperature; cogeneration power plants; mathematical modelling; irreversibilities; reversible power; power production; specific fuel consumption; SFC.

DOI: 10.1504/IJEX.2017.081202

International Journal of Exergy, 2017 Vol.22 No.1, pp.73 - 88

Published online: 26 Dec 2016 *

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