What is ship Energy Efficiency?

Energy efficiency design index (EEDI) defines the energy efficiency of the ship by design. It is the ratio of CO2 the ship would emit per ton-mile of the work done by the ship. SEEMP is a ship specific plan that provides the ship specific measures that need to be implemented for energy efficient operations.

How is EEXI calculated for ships?

The calculation of the EEXI follows the calculation of the well-known EEDI. It is based on the 2018 calculation guideline of the EEDI, with some adaptations for existing vessels. The draft guidelines (submission ISWG-GHG 7/2/7), are now replaced by the guidelines adopted at MEPC 76 in June 2021.

How do you calculate EEDI?

The reference value is defined by a line which is mathematically defined as: Required EEDI = a · b-c Table 1.1 lists the ship type depending calculation values for the required EEDI. The required EEDI will be reduced by X % each five years based on the initial value (Phase 0) and depending on the vessel size.

What is the difference between EEDI and EEXI?

The EEXI is like its predecessor, the Energy Efficient Design Index (EEDI)—in effect since 2013—but applied to existing ships outside EEDI regulations. It specifically targets vessels above 400 GT that fall under MARPOL Annex VI. To set CO2 emissions standards, the EEXI uses the same methodology as the EEDI.

How can ships improve energy efficiency?

Operational measures to increase operational efficiency These include slow-speed operation planning, higher capacity and resource utilization, and precise communication between shipping entities for efficient route planning. Reducing the turnaround time in ports is another way of increasing ship efficiency.

What does EEXI stand for?

Introduction of the Energy Efficiency Existing Ship Index (EEXI) During MEPC 76 in June 2021, the IMO adopted amendments to MARPOL Annex VI, introducing an Energy Efficiency Design Index for existing ships (EEXI). The requirements will enter into force at 1st of January 2023.

What is enhanced Seemp?

A strengthening of the SEEMP (Enhanced SEEMP) to include mandatory content, such as an implementation plan on how to achieve the CII targets, and making it subject to approval. Verification and audit requirements for the SEEMP will only apply to ships above 5,000 GT subject to the CII requirements.

How can I reduce my Eedi?

The EEDI thresholds can be met by reducing the hull resistance, which reduces the power required for propulsion. One way to achieve this is to increase hull length, beam or both to reduce the block coefficient, enabling a slenderer design, keeping the vessel’s cargo-carrying capacity unchanged.

How much fuel could be saved by building a bulb bow?

Bulbous bow can help to reduce a ship’s resistance and thus to save the fuel consumption up to 15%, however, it is also regarded as a threat to a struck ship in collision accidents because it may generally penetrate the side shell of the vessel, which may cause the leakage of hazardous goods.

What is the most fuel efficient shape for a vessel?

The Triple-E is the world’s largest and most efficient vessel. The vessel reduces emissions and fuel consumption through the combination of its two engines, efficient shape and an advanced waste heat recovery system.