Comparative feasibility study of combined cycles for marine power system in a large container ship considering energy efficiency design index (EEDI)

Ahn, Junkeon; Lee, Sanghyuk; Jeong, Jinyeong; Choi, Youn-Seok

doi:10.1016/j.ijhydene.2021.07.068

Cited by 14 publications

(2 citation statements)

References 21 publications

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“…Although the IMO has Energy Efficiency Design Index (EEDI) regulation to limit GHG emissions from medium and large ships [2] , small vessels with load line length below 24m and below 2000 deadweight tonnage (DWT) are not bound by the EEDI regulation. Existing research focus on large container ships [3] since they are considered to be the main source of GHG emissions from shipping sector. However, detailed GHG emissions data are not available for small watercrafts since they are not regulated.…”

Section: Introductionmentioning

confidence: 99%

Developing a Fuel Efficiency Index for Small Sized Marine Vessels

2022

J Mod Green Energy

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International Maritime Organization (IMO) has adopted the energy efficiency design index (EEDI) regulation to limit greenhouse gases (GHG) emissions from medium and large ships. However, small ships, boats and leisure watercrafts with load line length below 24m or deadweight tonnage (DWT) below 2000 DWT are not bound by the EEDI regulation. These small vessels exist in large numbers and there is a great scope to reduce GHG emissions from these watercrafts. This short opinion paper proposes an approach to evaluate the GHG emissions performance of small watercrafts that fall outside IMO regulation. To this end, a novel index termed small watercraft index is proposed by adapting the existing EEDI for different categories of small watercrafts. The approach proposed here helps standardise the evaluation of small watercrafts and may provide policy inputs for sub-IMO crafts. Furthermore, the proposed approach aids performance comparison of different small watercrafts.

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Section: Introductionmentioning

confidence: 99%

Developing a Fuel Efficiency Index for Small Sized Marine Vessels

2022

J Mod Green Energy

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“…As the maritime transport sector has become a significant contributor to global GHG emissions, the International Maritime Organization, which is responsible for environmental regulations, has made continuous efforts to reduce GHG emissions from ships (Wada et al, 2021). The Marine Environment Protection Committee (MEPC) has reviewed the emission regulations, including the Energy Efficiency Design Index (EEDI), Energy Efficiency Operating Indicator (EEOI), Energy Efficiency Existingship Index (EEXI), Energy Efficiency Performance Indicator (EEPI), and Ship Energy Efficiency Management Plan (SEEMP), and also simultaneously discussed the environmentally friendly frameworks for cargo ships (Ahn et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Greenhouse Gas Emission Analysis by LNG Fuel Tank Size through Life Cycle

Park¹,

Choi²

2021

J. Ocean Eng. Technol.

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As greenhouse gas emissions from maritime transport are increasing, the International Maritime Organization is continuously working to strengthen emission regulations. Liquefied natural gas (LNG) fuel is less advantageous as a point of CO 2 reduction due to the methane leakage that occurs during the bunkering and operation of marine engines. In this study, greenhouse gas emissions from an LNG-fueled ship were analyzed from the perspective of the life cycle. The amount ofmethane emission during the bunkering and operation procedures with various boil-off gas (BOG) treatment methods and gas engine specifications was analyzed by dynamic simulation. The results were also compared with those of other liquid fuel engines. As a result, small LNG-fueled ships without a BOG treatment facility emitted 32% more greenhouse gas than ships utilizing marine gas oil or heavy fuel oil. To achieve a greenhouse gas reduction via a BOG treatment method, a gas combustion unit or re-liquefaction system must be mounted, which results in a greenhouse gas reduction effect of about 25% and 30%. As a result of comparing the amount of greenhouse gas generated according to the BOG treatment method used with each tank size from the perspective of the operating cycle with the amounts from using existing marine fuels, the BOG treatment method showed superior effects of greenhouse gas reduction.

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