A significant advancement in marine energy efficiency was demonstrated through a recent test of the Hz Navi System, a cutting-edge technology designed to optimize fuel consumption for marine generators. Conducted aboard the NYK-operated bulk carrier White Princess from April 2023 to April 2024, the test showcased the collaborative efforts of NYK Line, MTI Co., Ltd., Oshima Shipbuilding Co., Ltd., Terasaki Electric Co., Ltd., and Daihatsu Diesel MFG Co., Ltd.
The Hz Navi System, engineered to reduce generator frequency to align with optimal operational specifications, successfully demonstrated a notable energy-saving effect. During the test, the system operated at a reduced frequency of approximately 57 Hz, resulting in a fuel consumption reduction of about 10%. The rigorous evaluation confirmed that the vessel could navigate safely with no reported abnormalities.
Traditional generator frequencies are set to ensure reliable operation of onboard equipment such as pumps and motors, even under extreme conditions. However, this results in unnecessary power consumption during normal navigation. The Hz Navi System addresses this inefficiency by allowing frequency adjustments within parameters set by ship classification rules, thereby reducing overall fuel consumption.
Developed through a joint patent by NYK and Tsuneishi Shipbuilding Co., Ltd., the Hz Navi System incorporates advanced “generator frequency control technology.” This innovation enables seamless switching between standard and energy-saving frequencies, optimizing fuel use and enhancing marine operational efficiency.
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