Page 30 - 2021 - Q3 - Minerva in Focus

GHG EMISSIONS: NEW REQUIREMENTS FOR SHIPPING

ESD devices: LUKOIL_Az_210x280_Kompass_auf_Wasser.qxp_Layout 1 30.09.19 10:05 Seite 1

An evaluation of the available alternatives

The IMO Greenhouse Gas (GHG) strat- The shipping industry is now adopting a more energy-efficient transportation model; there-
egy has set clear targets for reducing fore, shipmanagement and owning companies need the information to help them make
CO 2 emissions, which are reflected in more effective long-term decisions. Due to this necessity, Minerva has compiled a team to
the forthcoming Energy Efficiency Ex- review the available options and provide reliable insights on new technologies by focusing
isting Ship Index (EEXI) regulations and on energy-efficient solutions that improve environmental and operational efficiency.
Carbon Intensity Indicator (CII). The ef- The team is currently reviewing the specifications and evaluating the benefits of ESD de-
ficiency of ships is currently measured vices based on the investment type and an effective life cycle of 3 to 5 years. Therefore,
through RightShip’s Existing Vessel De- the results depicted in comparative return of investment graphs are estimated based on
sign Index (EVDI) that compares similar the vessel’s age and remaining years of operation for which this alteration will be imple- Think LUKOIL!
types and sizes of ships and gives them mented. The guidelines followed by the team aim to establish the extent to which these
a GHG emissions rating on a scale from ESD devices reduce the investment cost to achieve a short/reasonable payback period
A to G. and improve the GHG Rating based on each ESD device’s techno-economic analysis.
Several solutions have been screened for compliance with the set technical and opera-
tional criteria, i.e.:
• Proven energy savings
• Expected return on the actual ship
• Reduction of CO 2 emissions
• Reduction of vibrations caused by the propeller rotation

Schneekluth Duct

Most ducts, fins, or a combination thereof,
consist of strong fixed elements mounted
Mewis Duct
on the vessel and usually positioned in
front of the propeller and an integrated fin
system. The duct straightens and acceler-
ates the hull wake into the propeller and
produces a net forward thrust. The fins’
system provides a pre-swirl to the ship
wake that reduces losses in the propeller
Mitsui PBCF
slipstream resulting in an increase in pro-
peller thrust at a given propulsive power.
This effect can be provided separately or in combination since both effects contribute to one
another. The power savings attainable from ducts largely depend on the propeller thrust
loading and can range from 3 to 5% depending on individual hull/propeller interaction.
In terms of installation, hull ESDs are fitted during dry docking in the afterbody section. That
Schneekluth Duct
allows the work to be carried out at minimal cost as the semi-ducts are easy to handle using
a crane and can be set down and aligned on the port and starboard- side of the vessel hull
without difficulty. This easy handling ensures a high degree of dimensional accuracy, and no
future rework is required underneath the widely projecting top afterbody section.
At the same time, other solutions are being investigated, such as new propeller designs
and gate rudder types, which could also affect the overall vessel design offering the po-
tential for more cargo space.
Other technologies, which involve more radical designs such as Aeroline bow design, air
lubrication, or even wind-assisted solutions, are also evaluated. The ROI of the above
solutions largely depends on the fuel prices - it can range from 5 to 10 years, depending
on the system selected, propulsions configuration, and utilization and quality of wind
conditions on a route. Other issues to be studied and reviewed with Class societies are
stability, visibility, and the navigational systems blind spots, and how these can be dealt
with (i.e., by re-arranging systems on deck or adding extra cameras or radars if high scaling
of systems is preferred).
by Vayia Hatziyianni Considering the above, the application of these solutions is met more frequently in a
Head of New Buildings & Projects- new building rather than a retrofit project due to the high cost and complexity of the LUKOIL Marine Lubricants Germany GmbH
Technical Department, Minerva Marine Inc. installation requirements.
Phone: +49 40 180 4220 0
luboilorder@lukoil.com
28 MINERVA IN FOCUS – ISSUE 17 / Q3 2021
www.lukoilmarine.com