Browsing by Author "Chuku, Azubuike John"

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    Effects of energy efficiency design index on resistance, hydrostatics and ship design using Hughes-Prohaska method
    (Federal University of Technology, Owerri., 2024-02) Chuku, Azubuike John
    In this study, the investigation of the effects of energy efficiency design index on resistance, hydrostatics and ship design was successfully carried out. The aim is to determine how much the current Energy Efficiency Design Index (EEDI) formulations improve or conflict with ship design, vessel resistance, and hydrostatic laws. Parametric case studies of a Roll-on Passenger (Ro-Pax), Tugoat, and Reefer vessel are conducted for this reason. This group of vessels was picked because of how much energy they use naturally. To determine the impact of EEDI law on these three types of boats, Ship speed, Water Line Length (LWL), Beam (B), Draft (T), L/B ratio, B/T ratio, and Prismatic Coefficient (Cp) were examined. The results of the towing tank-model resistance tests were extrapolated to the three big ships, after the Hughes-Prohaska technique was used to evaluate the overall ship resistances and effective power of each of the models. In order to calculate the effective power, permissible power, and EEDI achieved, the resistance values previously extrapolated for the big ships were used. Based on correlation analysis of the data, the results indicate that there was an almost 89% agreement between the EEDI referenced and the EEDI attained. When the Hughes-Prohaska method's resistance data was verified against test data from an existing vessel model, an average error of 2% and a maximum error of 4% were discovered. It was deemed permissible to make this mistake. Effective power per unit displacement was plotted against each relevant parameter to examine the implications of EEDI on ship design, resistance, and hydrostatics. This is being done to ascertain the behavior of the EEDI attained. Additional findings showed that, with constant specific fuel consumption (SFC) and altering speed from 12 knots to 24 knots, the attained EEDI is proportional to the power (kW)/dead weight (tonne) ratio. It has been shown that at low speed, longer ships perform better on EEDI. However at higher speed, longer ships modify the L/B ratio, B/T ratio, draft, hydrostatic coefficients, increase resistance, and ultimately increase the ship's energy consumption. Further evidence suggest that in order to lower the EEDI, it is necessary to lower the pragmatic coefficient, optimize the hull, and decrease ship speed. In this instance, the 14% decrease in EEDI would be caused by the 13% sacrifice made to ship speed at the design stage. The graphs that were produced show that a ship may operate more efficiently and have a less environmental effect when the EEDI decreases.