| Summary: | The world is facing great challenges regarding the energy crisis and environmental pollution. One of the main challenges is the increasing number of ships with a lot of different types and sizes. In this research, it is essential to analyze the operational energy efficiency of sea-going ships since the previous studies have concentrated on the inland river ships. This working is carried out by analyzing of the energy efficiency operation for large size ships such as bulk carriers, container ships, etc. based on the resistance characteristics of different navigation environment factors. A numerical model of main engine energy efficiency operation was considered using the energy efficiency measure of IMO (International Maritime Organization), in particular using the Energy Efficiency Operational Indicator (EEOI) as a monitoring tool in this research. This EEOI numerical model was established and simulated through Simulink/Matlab and verified by the collected data from a certain vessel in Vietnam. The EEOI model was simulated under the different navigation environment conditions including various engine speed, wind speed, wave height, and water speed. After that, the simulation results of this research will be compared with experimental database of a certain bulk carrier namely M/V NSU JUSTICE 250,000 DWT. The results indicated that it is important to consider the main engine speed appropriately in ship operation in order to save energy onboard and reduce the greenhouse gas emission problem. Keywords: Ship energy efficiency, Bulk carrier, Navigation environment, EEOI, IMO
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