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HYBRID CREW TRANSFER VESSELS BENEFIT FROM LONG SEA TRIAL

HYBRID CREW TRANSFER VESSELS BENEFIT FROM LONG SEA TRIAL

Friday, September 10, 2021 

Two new crew transfer vessels (CTVs) 'MHO Asgard' and 'MHO Apollo' have arrived at owner MHO-Co HQ in Denmark, having made the 12,000 naut mile journey from the AFAI shipyard in China under their own power.

The delivery voyage served as an extended sea trial, highlighting several lessons, which have enabled power system suppliers Volvo Penta and Danfoss Editron to create a tailor-made solution fit for the owner’s requirements. The 34.4m long x 11m beam pair will serve the Hornsea Project 2 offshore wind farm in the North Sea. The power system is the result of a collaboration between Volvo Penta and Danfoss Editron, the companies having jointly developed a fully integrated solution made up of 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, allowing time to test and adjust the system to the owner’s requirements.

Mik Henriksen, CEO of MHO-Co, said: “These systems are a very important first step towards the future of sustainable operations at sea. We believe it is our shared responsibility to drive more sustainable solutions in the marine sector, and the best way to do this is through collaboration.”

The journey from China to Denmark allowed 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 fully electric operation or diesel-only. In DPS-mode fuel consumption is below 20 litre/hr. and can be as low as 17 litre/hr.

Erno Tenhunen, Danfoss Editron Marine Director, said: “The design, build, and delivery of these vessels was all about teamwork and collaboration. 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.”

Before the vessels enter operation, batteries are being installed in Denmark 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 about 24 knots. Using multiple modular generators allows operators to tailor power generation to the operational profile and enhance flexibly.

“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. 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,” said Jacob Vierø, Sales Project Manager, Volvo Penta.

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