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A multi-factor methodology for evaluation and optimization of plate-fin recuperators for micro gas turbine applications considering payback period as universal objective function

Peyman Maghsoudi (Department of Mechanical Engineering, School of Engineering, University of Tehran, Iran)
Sadegh Sadeghi (Department of Mechanical Engineering, School of Engineering, Iran University of Science and Technology, Tehran, Iran)
Qingang Xiong (IT Innovation Center, General Motors Corp, Warren, USA)
Saiied Mostafa Aminossadati (School of Mechanical and Mining Engineering, University of Queensland, Brisbane, Australia)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 29 July 2019

Issue publication date: 30 April 2020

Abstract

Purpose

Because of the appreciable application of heat recovery systems for the increment of overall efficiency of micro gas turbines, promising evaluation and optimization are crucial. This paper aims to propose a multi-factor theoretical methodology for analysis, optimization and comparison of potential plate-fin recuperators incorporated into micro gas turbines. Energetic, exergetic, economic and environmental factors are covered.

Design/methodology/approach

To demonstrate applicability and reliability of the methodology, detailed thermo-hydraulic analysis, sensitivity analysis and optimization are conducted on the recuperators with louver and offset-strip fins using a genetic algorithm. To assess the relationship between investment cost and profit for the recuperated systems, payback period (PBP), which incorporates all the factors is used as the universal objective function. To compare the performance of the recuperated and non-recuperated systems, exergy efficiency, exergy destruction and corresponding cost rate, fuel consumption and environmental damage cost rates, capital and operational cost rates and acquired profit rates are determined.

Findings

Based on the results, optimal PBP of the louvered-fin recuperator (147 days) is slightly lower than that with offset-strip fins (153 days). The highest profit rate is acquired by reduction of exergy destruction cost rate and corresponding decrements for louver and offset-strip fins are 2.3 and 3.9 times compared to simple cycle, respectively.

Originality/value

This mathematical study, for the first time, focuses on introducing a reliable methodology, which covers energetic, exergetic, economic and environmental points of view beneficial for design and selection of efficient plate-fin recuperators for micro gas turbine applications.

Keywords

Acknowledgements

Declarations of interest: None.

This work was financially supported by the Externally Collaborative Project from State Key Laboratory of Clean Energy Utilization, Zhejiang University, China under Grant No. ZJUCEU2017011.

Citation

Maghsoudi, P., Sadeghi, S., Xiong, Q. and Aminossadati, S.M. (2020), "A multi-factor methodology for evaluation and optimization of plate-fin recuperators for micro gas turbine applications considering payback period as universal objective function", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 30 No. 5, pp. 2411-2438. https://doi.org/10.1108/HFF-04-2019-0333

Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited