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Oslo: The data on the operational performance of the bow before and after the DNV collection shows that the redesign of the ball nose of the container ship at economic speed can save more than 5% of fuel. The economic return period for “nose plastic surgery†will be less than one year.
Hyundai Merchant Marine (HMM)'s range of 8600TEU container ships are designed and built to high speed craft. These ships can achieve 27 knots in actual operation, but currently operate at 15 to 18 knots of "economic speed." Under such low speed conditions, the existing bulbs are not efficient.
To quantify potential energy savings, DNV conducted a comprehensive study to develop and optimize a new bulb design to achieve the desired operational results. The cost-benefit assessment based on the estimated energy-saving effect has laid the foundation for the modern merchant ship to rebuild the ship.
According to DNV research results, Daewoo Marine Engineering Co., Ltd. (DSEC) carried out structural design work. The first reconstructed ship, the Modern Brave, was completed in March 2013.
After completing the "nose plastic surgery" in the dry dock, the ship's measurements showed that the $680,000 conversion would reduce fuel consumption by nearly 1,000 tons per year.
Taeg-Gyu Lee, executive vice president of Hyundai Merchant Marine, said, “In the past two months, as part of our verification work, we have carefully evaluated the performance of the new ball nose. The fuel savings in our operations so far have been around 5%. The economic return period is expected to be significantly lower than the estimated one year."
“DNV, the structural design team and the shipyard work closely together to ensure the timely completion of the design and installation work,†said Jost Bergmann, Commercial Director of DNV Container Ships. “The improvement in fuel economy has been partially loaded, unloaded and fully loaded. The next is very well reflected."
From the initial planning stage, the project took a total of 14 weeks. After prefabrication, the dock was completed in just two weeks and during the regular docking cycle of the ship.
DNV has developed a range of possible bulbous shapes to meet the new contours of the Modern Brave, all of which have been tested in computational fluid dynamics. The new ball nose did not increase the total length of the ship and was five tons lighter than the original structure.
DNV is convinced that the record success of the project will help other ship owners to improve the competitiveness of older ships. “Existing ships must compete with a large number of efficient and flexible new ship types,†Mr. Bergmann said. “In many high-speed designs of existing container ships, the bulbs have been greatly adjusted to achieve higher speeds. But the new situation is that This design has affected the efficiency of the existing ship's low-speed navigation. DNV's ball nose optimization service has convincing data, showing that this change will bring great value to the shipowner."