Article: Introduction of a performance analysis criterion called effective exergetic performance coefficient and application to an engine operated on seven-process cycle Journal: International Journal of Exergy (IJEX) 2025 Vol.46 No.1 pp.1 - 12 Abstract: In a few decades, the researchers studying on the optimisation and improvement of performance specifications and emission formations of the internal combustion engines have turned the attention on application of different cycles such Miller cycle and Takemura cycle into internal combustion engines. In this work, a novel analysis criterion named as effective exergetic performance coefficient (EFEXPEC) have been presented and applied to seven-process cycle consisting of Takemura cycle and Miller cycle. Maximum performance specifications such as maximum thermal efficiency, maximum power output, maximum EFEXPEC, power at maximum EFEXPEC and efficiency at maximum EFEXPEC have been examined. The consequences can be assessed by researchers who work on ICEs to actualise the proposed combination practically and to determine maximum EFEXPEC conditions. The maximum value of power (PMAX) is 27.3 kW and it has been obtained at 6,000 rpm and 20 of compression ratio. The maximum value of thermal efficiency is 40.15% and it has been obtained at 0.9 of equivalence ratio and 20 of compression ratio. The maximum value of EFECPEC (EFECPECMAX) is 0.18 and it has been obtained at 0.9 of equivalence ratio and 14 of compression ratio. Inderscience Publishers - linking academia, business and industry through research

Title: Introduction of a performance analysis criterion called effective exergetic performance coefficient and application to an engine operated on seven-process cycle

Authors: Guven Gonca; Ibrahim Genc; Mehmet Fatih Hocaoğlu

Addresses: Department of Naval Architecture and Marine Engineering, Yildiz Technical University, Besiktas, 34349, Istanbul, Turkey ' Department of Electrical-Electronics Engineering, Istanbul Medeniyet University, Kadikoy, 34720, Istanbul, Turkey ' Department of Electrical-Electronics Engineering, Istanbul Medeniyet University, Kadikoy, 34720, Istanbul, Turkey

Abstract: In a few decades, the researchers studying on the optimisation and improvement of performance specifications and emission formations of the internal combustion engines have turned the attention on application of different cycles such Miller cycle and Takemura cycle into internal combustion engines. In this work, a novel analysis criterion named as effective exergetic performance coefficient (EFEXPEC) have been presented and applied to seven-process cycle consisting of Takemura cycle and Miller cycle. Maximum performance specifications such as maximum thermal efficiency, maximum power output, maximum EFEXPEC, power at maximum EFEXPEC and efficiency at maximum EFEXPEC have been examined. The consequences can be assessed by researchers who work on ICEs to actualise the proposed combination practically and to determine maximum EFEXPEC conditions. The maximum value of power (P_MAX) is 27.3 kW and it has been obtained at 6,000 rpm and 20 of compression ratio. The maximum value of thermal efficiency is 40.15% and it has been obtained at 0.9 of equivalence ratio and 20 of compression ratio. The maximum value of EFECPEC (EFECPEC_MAX) is 0.18 and it has been obtained at 0.9 of equivalence ratio and 14 of compression ratio.

Keywords: dual-miller cycle; Takemura cycle; performance analysis; thermo-ecology; engine performance; internal combustion engines.

DOI: 10.1504/IJEX.2025.143811

International Journal of Exergy, 2025 Vol.46 No.1, pp.1 - 12

Received: 08 May 2023
Accepted: 06 May 2024
Published online: 07 Jan 2025 *

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Title: Introduction of a performance analysis criterion called effective exergetic performance coefficient and application to an engine operated on seven-process cycle

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