COMPARATIVE ANALYSIS OF THE ENERGY EFFICIENCY INDICES OF HYBRID ENGINE PROPULSION AND CONVENTIONAL PROPULSION SYSTEMS

The evaluated hybrid diesel-electric (HDE) and conventional diesel engine (CDE) propulsion systems’ energy efficiency operational indices (EEOI) were calculated. The EEOI of the CDE propulsion system and the evaluated HDE propulsion system were contrasted and examined. An optimal energy plan for integrated ship energy systems was put out to reduce ship emissions and operating expenses. For energy-efficient and emission-efficient shipping, the EEOI method was used to analyze data from voyages and operations at sea and in ports, as well as the work done from two case study ships: the MV Arcadia, which has a CDE propulsion system, and the MS Westerdam, which has a HDE propulsion system. The EEOI of the CDE propulsion system (MV Arcadia) and the proposed diesel-electric propulsion system (MS Westerdam) were favorably connected with their speed, fuel consumption, and voyage distance traveled, according to the broad-based results of the EEOI analysis. The EEOI of the MS Westerdam was 1.80336 x 10-5 t CO2/ton-mile, which was higher than that of the MV Arcadia, whose EEOI was 1.79 x 10-5 t CO2/ton-mile, according to the EEOI analysis of the journeys between the two ships. The two ships’ journeys over the next years of the research period were comparable. Since NOx emission has a correlation with engine combustion temperature and burning marine diesel oil (MDO) produced higher NOx emission rates than ultra-low Sulphur heavy fuel oil (ULSHFO), the results also showed that when comparing the emission rates of the ships, the CDE emitted more NOx emission rates than the HDE engine. Because SOx emissions depend on the combustion fuel’s sulfur level, the CDE produced more SOx emissions than the HDE. Although the carbon content of the fuel affects the CO2 emission rates in the two options, the HDE engine generated lower CO2 emissions than the traditional diesel engine. Consequently, HDE should be used as the best energy strategy for integrated ship energy systems in ship propulsion since it has a higher EEOI and lower CO2, NOx, and SOx emission rates than a ship propelled by a traditional diesel engine.

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