The assessment of alternative fuel and engine power limitation utilisation in hybrid marine propulsion systems regarding energy efficiency metrics

Yuksel, O, Pamik, M and Bayraktar, M (2025) The assessment of alternative fuel and engine power limitation utilisation in hybrid marine propulsion systems regarding energy efficiency metrics. Journal of Marine Engineering and Technology. pp. 1-15. ISSN 2046-4177

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Abstract

The adoption of alternative fuels is vital for meeting maritime decarbonisation targets. While various options exist, liquefied natural gas (LNG) is the leading choice, with methanol gaining ground. Integrating LNG and methanol in hybrid propulsion systems (HPSs) improves operational efficiency and ensures compliance with energy efficiency standards. This study explores the environmental benefits of HPSs using a scenario-based approach in which the existing propulsion system of a Ro-Ro (Roll-on/Roll-off) cargo ship is replaced with HPSs powered by LNG, methanol, or conventional fuels. Results demonstrate that implementing HPS alone on the vessel reduces fuel consumption by up to 21% across all scenarios by managing power fluctuations in the main engines. The LNG-HPS scenario lowers the attained Carbon Intensity Indicator (CII) by 36% to 4.13, keeping the CII rating at level A until the end of 2026. The methanol-HPS scenario achieves a fuel reduction of up to 22%, yet none of the scenarios meets the Energy Efficiency Design Index (EEDI) Phase III threshold of 7.65. To surpass this threshold, vessel speed reduction applications with alternative fuel utilisation, are evaluated. This integration improves the case ship's EEDI to 6.2 for LNG and 7.3 for methanol scenarios, exceeding threshold values for energy efficiency metrics.

Item Type:	Article
Uncontrolled Keywords:	4015 Maritime Engineering; 40 Engineering; 7 Affordable and Clean Energy; 4007 Control engineering, mechatronics and robotics; 4015 Maritime engineering; 4602 Artificial intelligence
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Divisions:	Engineering
Publisher:	Taylor and Francis Group
Date of acceptance:	10 March 2025
Date of first compliant Open Access:	10 June 2025
Date Deposited:	10 Jun 2025 10:32
Last Modified:	10 Jun 2025 10:45
DOI or ID number:	10.1080/20464177.2025.2479319
URI:	https://researchonline.ljmu.ac.uk/id/eprint/26563

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