Mitsui E&S Shipbuilding Co. (MES-S) and Mitsui E&S Machinery Co. (MES-M) have started an engineering service for improving propulsion system efficiency to achieve GHG emissions reduction for existing vessels.
The Mitsui E&S Holdings Co. subsidiaries noted that most vessels built prior to the Energy Efficiency Design Index (EEDI) regulation coming into force ‘have not been improved from their original design with higher GHG emission in ton mile basis compared with vessels built after’.
The companies said: ‘[In] [r]ecent years, social demands for reducing GHG emissions for existing vessels are increasing and measures are required urgently. Under such circumstances, MES-S and MES-M propose the improved propulsion system in whole to achieve GHG emissions reduction for existing vessels utilising the technologies on propulsion efficiency and main engine energy efficiency, which have been ever cultivated throughout the development of vessels and main engines.’
According to the pair, with MES-S’s engineering service, propulsion efficiency of existing vessels is improved by optimised Energy Saving Devices (ESD) and propeller design according to individual vessel design. This is developed together with MES-S’s subsidiary, Akishima Laboratories (Mitsui Zosen) Inc., based on optimisation design technology with advanced numerical simulation using existing vessels’ hull form data.
Furthermore, MES-M says it will improve energy efficiency for its own manufactured main engines by optimising its tuning to match the vessel’s actual operation.
‘These Energy Saving Devises (ESD), improved propeller and main engine tunings work synergistically to maximise the effect of GHG emissions reduction under collaboration between MES-S and MES-M,’ the companies said.
MES-S and MES-M say they will use their experience in the development and design capabilities of vessels and main engines to contribute ‘to realis[ing] a sustainable society’ and the ‘expansion of vessel’s life cycle solution services’.