Research on Energy Efficiency Design Index Calculation Method for the Hybrid Ship

Abstract

The Marine Energy Efficiency Design Index (EEDI) is recognized as an effective tool to measure the level of carbon emissions from ships at home and abroad. It will play an important role in the assessment of carbon emissions from the shipping industry, especially under the current and future development goal of carbon neutrality. Various green technologies to reduce the carbon emissions of ships have been demonstrated and applied. Hybrid power system is one of them. Compared with traditional direct propulsion, it can significantly reduce the energy consumption and carbon emissions of ships in inland waters such as the Yangtze River. Based on the characteristics of the hybrid power system, this paper firstly analyzes the power types of the hybrid power system during ship navigation. Then, according to the principle and elements of EEDI calculation method, it puts forward the key problems that should be solved in ship EEDI calculation of hybrid power system. Then, according to different hybrid operation modes, it also puts forward the calculation method of EEDI of each power mode and the calculation method of acquired EEDI of hybrid ship. Finally, the calculation and analysis of a 7500DWT hybrid bulk carrier show that the EEDI calculation method for hybrid ships proposed in this paper is scientific and reasonable.