In 2013, EEDI (Energy Efficiency Design Index) has been entered intoforce as an international convention to reduce emission of carbondioxide. The enforcement of EEDI leads shipbuilders to focus onfurther improvement on ship hydrodynamic performance by developingESDs (Energy Saving Devices) as well as designing more efficient hullforms and propellers.This study presents the results of development and application of ESDsdesigned by SHI (Samsung Heavy Industries) to improve shipresistance and propulsion performances. SHI developed a novel ESDnamed SAVER Fin(SAmsung Vibration and Energy Reduction Fin),which is a simple fin-shaped appendage attached on the stern bilge area.It produces a series of strong vortical streams, which acceleratesretarded flow near stern region to make inflow of the propeller moreuniformly distributed. Increase of the flow velocity recovers pressurenear the stern region more, and thus hull resistance is decreased. Also,more uniformly distributed inflow of the propeller significantly reducesthe level of hull vibration induced by the rotating propeller. Powersaving by reduction of the hull resistance was confirmed with themodel tests from SSMB (Samsung Ship Model Basin) at both designand ballast draughts. To verify the performance of SAVER Fin in fullscale, sea trial tests were performed for a series of 35K bulk carriers.Two vessels, one equipped with SAVER Fin and the other with a ducttypeESD, were chosen for the sea trial tests to assess the effectivenessof the two different ESDs on fuel consumption and RPM margin. Thispaper addresses the findings about the two ESDs' performance in powersavings based on the model test and the sea trial results.
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