The ultimate sea trial
A 12,000 nautical mile journey for two new hybrid CTVs became a voyage of discovery in the ultimate sea trial.
The two 34.4m CTVs travelled from China’s AFAI Southern Shipyard to MHO-Co’s headquarters in Esbjerg, Denmark. The vessels’ power system is the result of a collaboration between Volvo Penta and Danfoss Editron, developers of new propulsion technology.
The two companies have developed a fully integrated solution comprising a Danfoss Editron electric drivetrain supported by Volvo Penta variable speed gensets that drive two of the first Electric Volvo Penta Inboard Performance System (IPS) units as well as two D13 Volvo Penta IPS units. The new IPS units have already achieved 1,000 hours of operation before even reaching the customer. The impressive mileage has given all the teams time to test and adjust the system to create a tailor-made solution that fits the owner’s requirements.
Danfoss Editron and Volvo Penta treated the journey from China to Denmark as a pilot project and a time to work with the captains and crew to tweak the novel technology onboard and make it as reliable and efficient as possible for the customer. The companies were able to test different power combinations, such as diesel-electric operation or diesel-only. In Dynamic Positioning System-mode (DPS-mode) fuel consumption is below 20 litres/hr. and can be as low as 17 litres/hr. considered exceptional for vessels in this size class.
Batteries are being installed in Denmark, before the vessels enter operation, to provide stored power for zero-emissions operation. This system will allow the vessels to operate in zero-emission electric mode for up to eight hours or, in combination with diesel propulsion, to achieve a maximum speed of approximately 24 knots. Using multiple modular generators allows operators to tailor power generation to the operational profile and enhance flexibly.
“The design, build, and delivery of these vessels was all about teamwork and collaboration,” explains Erno Tenhunen, Danfoss Editron’s Marine Director. “Ultimately, these are learning projects on all sides. We are trying to push the limits of technology, and the best way to do this is to bring our unique ideas, perspective, and knowledge together. That’s exactly what we have done here.”
“We’re excited to see these vessels go into action in the North Sea. This pilot project has been hugely beneficial in helping us create the building blocks for future projects,” adds Jacob Vierø, Sales Project Manager, Volvo Penta. “Each operation will be different and require a tailor-made propulsion solution, but this project has allowed us to both develop the technology and collaborative process that can be adapted for future commercial operations.”
The vessels will be run by operator MHO-Co and service the Hornsea Project 2 offshore wind farm in the North Sea.
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