engleski

Improving ship energy efficiency performance by energy saving devices

Due to demanding IMO regulations on the ship EEDI, increased attention has been brought to the research of Energy Saving Devices (ESDs). Such devices offer an easy, fairly reliable and relatively cheap gain in a conservative shipbuilding industry where the applications of alternative sources of power are still at the initial phase. However, there is still no full insight for all ESD shapes and their correlation to ship operational profiles. This study aims to assess the direct impact of the currently most reliable ESD (the circular duct) on the EEDI and gas emissions. Unfavourable non-uniform inflow on the propeller plane is a known cause for generating vibrations and noise, but is also accountable for significant propeller efficiency losses. By measuring the propeller characteristics during the self-propulsion experiments in model scale, the influence of the ESD can be estimated on the full scale ship power demands. In this study two types of engines are compared and the reduction in power delivered from the main engine to the propeller shaft with the ESD employed is shown. The decrease in the final main engine power needs is used to further estimate the lowering of the gas emissions (carbon dioxide) and EEDI at minimum ship design modifications.

Ship ; Energy efficiency ; Energy saving device (ESD)

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