Carbon dioxide emissions
Carbon dioxide emissions are directly related to the vessels’ fuel consumption. The target going forward is to achieve an average reduction of 0.3 tonnes in fuel consumption per vessel per day at sea. In order to continuously reduce emissions, great emphasis is placed on efficient operation and ongoing technical improvements on vessels.
Efficient commercial and technical operation
Within the framework of commercial and technical operation, a large-scale fuel efficiency program has been in progress since 2012, and this has resulted in significantly reduced carbon emissions. Activities and measures include more frequent and detailed monitoring of vessels’ energy consumption and implementation of advanced systems and routines that bring speed and route optimisation based on weather conditions, demurrage, bunker costs and customer needs.
Since the project began, fuel efficiency measured as freighted cargo (tonnes) in relation to fuel consumed (tonnes) has increased by 20 percent. The reduced bunker consumption resulted in a reduction of over 8,220 tonnes in carbon dioxide emissions and approx. 68 tonnes in sulphur dioxide emissions in 2017. Nitrogen oxide emissions were reduced by 234 tonnes and particle emissions by 3.0 tonnes.
Technical development and maintenance
In addition to work on route planning, optimisation of speed and energy management, the Company also conducts extensive and continuous technical development and maintenance of the vessels. Various measures to reduce fouling on the hull, propellers and gears have a large effect on fuel consumption. Fouling has the effect of significantly increasing fuel consumption and it may also have an adverse effect on handling, and therefore safety. Great effort has also been put into further technical development of the propellers, including the installation of hub vortex absorbing fins behind the propellers. The fins break the vortex that would otherwise be created behind the propellers.
VTA (Variable Turbine Area) turbines have been installed on four of the ships in the fleet in order to reduce emissions of sulphur and nitrogen oxides. The main advantage is that by angling the blades in the turbine, the turbine’s thermal efficiency can be adapted to the vessel’s speed, which reduces fuel consumption.