NYK will install a variable compression ratio (VCR) system on two large LNG-fuelled coal carriers to be built by Oshima Shipbuilding Co., Ltd.
The vessels are scheduled to be delivered by the end of 2025.
VCR systems will reportedly be placed on boats for the first time, including existing vessels that utilise heavy fuel oil as their primary fuel.
The VCR system can optimise the air compression ratio in the engine combustion chamber based on engine power and LNG fuel qualities.
This modification is expected to increase fuel economy during operation by approximately 3 per cent in LNG gas mode and approximately 6 per cent in diesel oil mode.
The system is also salted to play a vital role in reducing greenhouse gas (GHG) emissions from existing ships and improving engine efficiency when decarbonised fuels are introduced.
Based on its technology and experience with large low-speed marine engines, Mitsui E&S DU Co., Ltd. developed the VCR system together with Winterthur Gas & Diesel Ltd, a Swiss engine licensor.
This month, Knutsen NYK Carbon Carriers AS (KNCC), an affiliate of NYK, received a General Approval for Ship Application (GASA) from the Norwegian classification society DNV for its Liquefied CO2-Elevated Pressure (LCO2-EP) containment system.