Easier EEDI process: DNV validates Norsepower’s new EEDI/EEXI calculation method


Norsepower, the global market leader in mechanical sails, has presented a revolutionary calculation method, validated by the leading classification society DNV.  The Norsepower E-Cal Method accurately calculates the effective power of Norsepower Rotor Sail™ (NPRS™). This helps ensure the vessel’s compliance with the latest IMO regulations, reducing the business risk for the shipyards, shipping companies, and ship owners.  The result of NPRS™ propulsion power for the EEDI and EEXI calculations can be defined by the validated calculation method without ship-specific full-scale tests.

The new regulations introduced by the IMO in 2021 (MEPC.1/Circ.896) mandates that the calculated performance of wind-assisted propulsion systems must consider aerodynamic interactions from the ship itself and the other rotor sails. Until now, this type of calculation could only be attained using demanding and costly processes such as model scale tests, computational fluid dynamics (CFD) simulations or full-scale tests.

To address this, Norsepower has developed an innovative method that combines CFD simulations, previously measured full-scale measurement results, and semi-empirical methods for the sail/sail interaction. This groundbreaking method has been validated against full-scale measurements in vessels already using NPRS™. The method eliminates the need for complex physical measuring methods and simplifies the calculation validation process.

Jan Wienke, Principal Engineer at DNV, commented on the collaboration: “We are proud to have been chosen as the classification partner to review and validate Norsepower’s E-Cal Method against the MEPC guidance. DNV has been working on Wind Assisted Propulsion systems for several years now and we are always looking to help build confidence in these systems as the industry looks to tackle the decarbonisation challenge. This is the first review of this type DNV has performed, and we look forward to continuing to work with Norsepower.

Fabian Kock, Head of Section of Environmental Technology Air at DNV, added: “Gains in energy efficiency are an essential part of the maritime industry’s energy transition. They can not only enhance a vessel’s sustainability, but enable the use of new fuels, and prolong compliance as regulations tighten. But for innovations to gain widespread acceptance, they need to proceed on a basis of trust. Which is why we were very pleased to work with Norsepower on this validation.

The main benefits of the new method are:

1. Simplified and reliable EEDI/EEXI calculations.
2. Direct translation into compliance with FuelEU Maritime regulation regarding wind propulsion reward factor.
3. Quicker first estimations of the EEDI impact of installing Norsepower Rotor Sails™ to make more informed decisions.

Heikki Pöntynen, CEO of Norsepower, commented on the significance of the collaboration: “We are proud to introduce this new technology with support from DNV as it’s another step forward in making energy efficiency calculations quicker, easier and more accurate. Obtaining the seal of approval from such a reputed classification society confirms that we are on the right track. The Norsepower E-Cal Method sets a new standard for the maritime industry and reinforces our commitment to driving sustainability and innovation.

The collaboration between Norsepower and DNV marks a significant milestone in the advancement of wind propulsion technology, providing shipowners with a reliable and efficient solution for reducing emissions and achieving regulatory compliance.

About Norsepower
Norsepower Oy Ltd is a Finnish clean technology and engineering company pioneering mechanical sails. The Norsepower Rotor Sail™ has been used by customers for already ten years and has been installed on various ship types such as tankers, LCO2 carriers, bulk carriers, and RoRo and RoPax vessels. The installed base will be more than doubled within the next 12 months. Fuel-saving performance of the Norsepower Rotor Sails™ has been confirmed by independent third-party verifiers such as ABB, NAPA, and Lloyd’s Register. The product is seen as one of the most prominent already existing solution for significantly reducing the carbon emissions of shipping. 

For more information on the Norsepower Rotor Sail™, please visit: www.norsepower.com

About DNV
DNV is the world’s leading classification society and a recognized advisor for the maritime industry. We enhance safety, quality, energy efficiency and environmental performance of the global shipping industry – across all vessel types and offshore structures. We invest heavily in research and development to find solutions, together with the industry, that address strategic, operational or regulatory challenges. 

For more information visit: www.dnv.com/maritime 

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