The Impact of Hull Form on Efficiency
Against the background of fuel prices, climate change and energy security issues there is growing interest in improving the fuel efficiency of shipping vessels. Amongst other things, this has resulted in a regulation governing the design efficiency of new ships called the Energy Efficiency Design Index, or EEDI for short. As of 2013, new ships are required to have an EEDI that meets or exceeds a certain target, set as a percentage efficiency improvement relative to a baseline constructed from the average design efficiency of ships entering the fleet in the period 1999-2008. The percentage improvement is set to increase from 0% in 2013 (all vessels as efficient as the average of ships built between 1999 and 2008) to 30% from 2025 onwards.
The Marine Environment Protection Committee (MEPC) of the International Maritime Organization (IMO) is currently engaged in a review of the 2020 target. One of the main questions being addressed is whether the stringency of the regulation should be retained or amended. Another issue of general interest is the effectiveness of existing EEDI targets in driving design efficiency improvements.
This study analyses what factor or factors have contributed to changes in the average design efficiency over time and what their relative importance has been.
Key findings of this study: