Impact of EEDI on Ship Design and Hydrodynamics A Study of the Energy Efficiency Design Index and Other Related Emission Control Indexes
Abstract: Around 90% of global trade is carried by sea1 due to the reason that it is the most economicaland fuel efficient mode of cargo transportation. The total trade volume is increasingthroughout the last century for the same reason. On the other hand according to the GreenHouse Gas study by IMO, International Maritime Organization in 2000, ships engaged ininternational trade in 1996 contributed about 1.8% of the total world’s CO2 emissions whichis approximated as 2.7% in 20072. At the present trend, this percentage could go two or threetimes higher from the present by 20503.In order to control this CO2 emission from shipping, IMO has developed the first ever globalCO2 reduction index in the world, known as ‘EEDI’, Energy Efficiency Design Index. Thebasic formulation of EEDI is based on the ratio of total CO2 emission per tonne.mile. As CO2depends upon fuel consumption and fuel consumption depends upon the total powerrequirements, eventually this EEDI formulation has certain impact on ship design parametersand hydrodynamics.At this point SSPA Sweden AB4 wanted to have an in depth knowledge about the backgroundof EEDI, other indexes (except EEDI) for reducing CO2 emission developed by otherorganizations, formulations of different indexes and working method, impact of EEDI on shipdesign and the hydrodynamics. In order to find the impact on ship design and hydrodynamics,parametric analyses of ship is accomplished for different ship types such as Bulk Carrier,Tanker, Container vessel etc. A simple tool has been developed to calculate resistance andpower with Holtrop & Mennen, 1982 method. Using the tool the main engine power ispredicted after calculating the resistance and finally EEDI is calculated with the current IMOformulation.Finally, the results are presented as the effect on EEDI and hydrodynamics by changing shipdesign parameters such as Length, Beam, Draft, Prismatic Coefficient, Block Coefficient andsuggestions have been made in order to achieve the required EEDI. An effort was also madeto analyse the criticism against the present EEDI formulation, guideline and reference line, asit is quite a heavy debate now, whether this implementation will really reduce the CO2emission or not.
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