bound4blue has taken another step forward in its mission to accelerate and simplify the adoption of wind power, with the validation of its ‘wind propulsion system force matrix calculation methodology’ by Lloyd’s Register (LR).
The validation gives shipowners a robust, credible and compliant means to calculate the Pwind value of installations, ensuring they unlock full regulatory (and cost) benefits under frameworks such as FuelEU Maritime, and EEDI/EEXI.
Advanced CFD-based calculations
LR validated the approach, which utilises advanced CFD-based (Computational Fluid Dynamics) calculations, validated with wind tunnel test results.
The installation earlier this year of four bound4blue eSAILs® onboard juice carrier M.V. Atlantic Orchard, chartered by Louis Dreyfus Company (LDC) and owned by Wisby Tankers, is the first to benefit from this methodology validation.
Building confidence
Shipowners can now take advantage of a reliable tool to calculate the regulatory benefits
With this validation, shipowners can now take advantage of a reliable tool to calculate the regulatory benefits of the unique suction sail technology without the need for full-scale testing, saving significant time and money.
As Alberto Llopis, Head of Aerodynamics at bound4blue, explains, this helps build trust and ease acceptance for the company’s systems as wind-assisted propulsion “truly takes off” in the market.
Applicable international Rules and Standards
“Validation by Lloyd’s Register is a key enabler for shipowners who want to realise the full value of wind propulsion,” comments Alberto Llopis.
He adds, “By confirming our methodology aligns with all applicable international Rules and Standards, it ensures our clients can confidently calculate Pwind to simplify regulatory compliance and unlock substantial financial savings. It removes uncertainty and enables more informed decision-making, underlining the attractiveness of wind as a prime mover in maritime’s much-needed energy transition.”
A methodology that matters
Pwind is the calculated propulsive power available from a WAPS, such as the eSAIL®
Pwind is the calculated propulsive power available from a wind-assisted propulsion system (WAPS), such as the eSAIL®, and plays a central role in environmental compliance.
Defined under IMO’s “2021 Guidance on treatment of innovative energy efficiency technologies” (MEPC.1/Circ.896), Pwind can be deducted from a ship’s required engine power under EEXI/EEDI calculations, reducing the vessel’s regulatory burden.
It is also directly linked to the Wind Reward Factor in FuelEU Maritime, potentially relaxing GHG targets and lowering compliance-related expenses.
Thrust characteristics of a WAPS
The force matrix - which represents the thrust characteristics of a WAPS under various wind conditions - must be installation-specific (considering both sail-to-sail and ship-to-sail aerodynamic interactions) and validated by an independent verifier.
LR’s validation confirms that bound4blue’s methodology meets the standards set by IMO, ensuring consistency and transparency.
Ambitious decarbonisation targets
Speaking about the implications of the process, LR Advisory Ship Performance Manager, Dr. Santiago Suarez de la Fuente, said: "As the maritime industry works towards ambitious decarbonisation targets, shipowners and technology developers need confidence that their investments align with both evolving regulatory expectations and their own objectives."
He adds, "At LR, we’re proud to support the safe and effective adoption of breakthrough technologies, such as bound4blue’s eSAILs®, by providing transparent, independent validation shipping companies can rely upon. We’d like to thank both bound4blue and LDC for their excellent collaboration on this project."
Accelerating acceptance
New eSAIL® installation using the same CFD-based approach can efficiently obtain a verified Pwind
LR’s validation is more than a standalone achievement. While force matrices must be calculated specifically for each ship and sail installation, the validated methodology is now transferable across future projects.
This means that any new eSAIL® installation using the same CFD-based approach can efficiently obtain a verified Pwind - streamlining compliance, accelerating project timelines, and making the business case for wind propulsion even stronger.
Wind power solutions
"At LDC, we see validated wind power solutions as a clear win: one that supports our ambitious decarbonisation goals, saves fuel costs and delivers strong regulatory advantages," says Fabian Kowatsch, LDC’s Shipping Decarbonisation Lead.
He adds, "Thanks to the Pwind validation, we can now factor wind propulsion into our regulatory planning, accurately calculate the FuelEU Wind Reward Factor and significantly reduce our compliance costs."
Mounting momentum
Wind is the only power source actively rewarded through the framework, with compliance targets
Demand for wind propulsion solutions, such as suction sails, is increasing since the advent of the FuelEU Maritime regulation. Wind is the only power source actively rewarded through the framework, with compliance targets for relevant vessels relaxed by up to 5%.
eSAILs® also create energy efficiency benefits for EEDI and EEXI, reduce emissions and costs relating to EU ETS, and positively impact CII ratings.
Array of vessel segments
bound4blue’s fully autonomous units are riding this wave of momentum, with recent orders placed by companies such as Maersk Tankers, Marflet Marine, Klaveness Combination Carriers, Eastern Pacific Shipping and other pioneering shipping companies.
The mechanically simple, proven technology has a typical payback period of less than five years and is suitable for either newbuilds or retrofitting across a diverse array of vessel segments. This includes, but is not limited to, Tankers, Bulkers, Ro-Ros, Cruise vessels, Ferries, Gas Carriers and General Cargo vessels.
