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    Worker looses life in incident on Woodside’s North Rankin Complex

    Worker looses life in incident on Woodside’s North Rankin Complex

    EU proposes new measures for safe and green shipping

    EU proposes new measures for safe and green shipping

    UK MAIB

    Lessons learned: Never leave the scene of a collision until everything is under control

    Lessons learned: Always ensure you have an accurate picture of the traffic situation before departure

    Lessons learned: Always ensure you have an accurate picture of the traffic situation before departure

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    Grimaldi orders two new ammonia ready car carriers

    Grimaldi orders two new ammonia ready car carriers

    MT NORE METHANOL BUNKERING BUNKER ONE

    Bunker One launches methanol-ready bunker tanker

    Smart Green Shipping and NTS join Winds of Change

    Smart Green Shipping and NTS join Winds of Change

    Maersk: Electricity availability limits e-fuels in the maritime industry

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    Port of Stephenville to become green hydrogen hub

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    Back To The Future: How Rotor Sails are now a credible option to tackle climate challenge

    Back To The Future: How Rotor Sails are now a credible option to tackle climate challenge

    eu ets maritime

    The EU’s objectives for sustainable shipping

    METIS: Digitalisation can assist vessels to achieve optimum performance and minimise their emissions

    METIS: Digitalisation can assist vessels to achieve optimum performance and minimise their emissions

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SAFETY4SEA

Wind propulsion along with fuel cells can improve ships’ climate footprint, report finds

by The Editorial Team
January 10, 2022
in Fuels
fuel cells carbon capture
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The International Council on Clean Transportation (ICCT) published a new study, investigating the potential of both liquid and compressed hydrogen fuel cells to replace fossil fuels for bulk carriers, including when paired with wind-assisted propulsion in the form of rotor sails.

The study modeled three bulk carriers:

  • A 57,000 deadweight tonne (dwt) coastal dry bulk carrier sailing in China;
  • A 69,000 dwt ore and coal carrier sailing the North American Great Lakes;
  • A 7,570 dwt cement carrier in northern Europe.

It also used 2019 AIS ship traffic data and weather data observations to estimate the ships’ total energy use and the energy-saving potential of rotor sails for two routes for each ship.

Across the three ships, ICCT found benefits from the rotor sails and several port-to-port energy savings of 0.1% to 7.2% per rotor.

RelatedNews

FEPORT: Policymakers should ensure a level playing field has context menu

Back To The Future: How Rotor Sails are now a credible option to tackle climate challenge

The two larger ships had lower relative savings compared to the smaller ship because the power generated by the rotor is smaller relative to the total power used by the engines

the report says.

More specifically, using liquid hydrogen (LH2), the two larger ships could complete both of their modeled routes even without the help of wind-assisted propulsion.

For the Great Lakes bulk carrier –  the largest ship – adding rotor sails would reduce fuel consumption and therefore fuel costs by up to 1.4% per rotor. For the Chinese bulk carrier, savings are even larger at up to 3.1% per rotor.

Rotor sails also had the greatest energy-saving potential for the European bulk carrier and were capable of port-to-port energy savings up to 7.2% per rotor.

“With four rotor sails, energy savings of up to 28% or more are possible,” notes ICCT, adding however that the smaller European bulk carrier does not have as much space available on board for LH2, making reliance on hydrogen more challenging for this ship than the other two. In fact, only the shortest of the five legs could be achieved with LH2 alone. Two other legs could be achieved using rotor sails in combination with LH2. As for the two longest legs, they could be achieved if it replaced 2.4% of its cargo space with LH2 in combination with four rotor sails.

Furthermore, using compressed hydrogen (CH2) presents its own challenges, as only the Chinese bulk carrier could use this fuel to complete its typical operations.

It could achieve three of the four legs we modeled using CH2 alone and could achieve the fourth leg with the addition of six rotor sails. The other two ships do not have enough space available to carry enough CH2 to meet their energy needs along the routes we modeled

the study found.

Credit: ICCT

This research also examined the factors that affect energy savings from rotor sails. It found that energy savings vary depending on wind conditions and are sensitive to wind speed and wind direction.

Energy savings are also sensitive to how quickly the rotors spin:

  • Too slow and they do not generate much thrust;
  • Too fast and they consume more energy than they save.

The size of the rotor sails also affects performance, as taller rotors result in greater energy savings. Lastly, overall energy savings increase as the total number of rotors increases.

Ships powered by wind-assisted propulsion paired with liquid hydrogen fuel cells would generate no direct pollution

ICCT believes. Nonetheless, it mentioned that “the hydrogen would need to be sourced from renewable energy and not fossil fuels to have climate benefits.”

As for rotor sails, they can reduce the amount of fuel that ships consume and can be retrofitted on existing conventionally fueled ships to reduce fossil fuel consumption. In addition, they can also be installed on new ships, including hybrid and zero-emission vessels, to save on energy costs.

As such, they are able to help ships comply with international regulations such as the Energy Efficiency Design Index and Energy Efficiency Existing Ship Index, or domestic regulations that limit the carbon-dioxide-equivalent intensity of ships.

Knowing that rotor sails can reduce energy use and emissions for new and existing ships could give governments the confidence to raise the ambition of climate policies

the study concludes.

EXPLORE MORE IN THE ICCT STUDY

Tags: decarbonizationfuel cellshydrogenICCTreducing shipping emissionsreportswind propulsion

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