Key Technologies Study On General Energy Efficiency Design Of VLCC

Energy Efficiency Design Index (EEDI), which has been approved by IMO, is a new challenge for naval architect and should be paid more attention.The EEDI calculation formula and reference line have been introduced firstly in this thesis, and then analyzed the parameter in the formula to find out the most essential ways of affecting on EEDI value. VLCC has been chosen as a model to study the general energy efficiency design method.The reasonable decision method of VLCC's main parameter has been investigated in this thesis, which is the basis of energy efficiency design. It included the matching of ship route, ship speed and other main parameters. Three different methods for improving EEDI value of the ship have been analyzed in detail, including optimization of speed/power, increase in deadweight and introduction of innovative technologies. The most obvious way to reduce the EEDI index is to reduce installed main engine power and thus also reduce design speed of the ship. Meanwhile, the choice of the lager stroke/bore ratio main engine, the selection point of SMCR, the hydrodynamic optimization and the use of energy saving device could further reduce the EEDI value. The second way to reduce the EEDI index is to increase the deadweight through research of new rules, layout of superstructure, and improve on cargo tank and water ballast tank arrangement. There are also many of energy saving technologies which have very positive effects on ship's EEDI index and the development should be noticed. We seize the key technologies about the general energy efficiency design of VLCC through these researches, which is useful for other ship types.