Class 1 (Chief Engineer) Engineering Management 📅 Jul 2022

Exam Question

IMO has introduced the EEXI requirements under MARPOL Annex VI Chapter IV for existing vessels from 2023 as a measure towards reduction of CO2 emissions from shipping. Explain the various design features adopted in the existing vessels to comply with the present EEXI which meets the EEDI framework under Phase 2 or Phase 3 as applicable.

Reference Answer

### **Introduction to EEXI**
The Energy Efficiency Existing Ship Index (EEXI) is a mandatory technical measure introduced by the International Maritime Organization (IMO) under MARPOL Annex VI, Chapter IV, effective from 1st January 2023. It is designed to improve the energy efficiency of the existing international shipping fleet, bringing them in line with the standards required for new builds under the Energy Efficiency Design Index (EEDI) framework, specifically targeting EEDI Phase 2 or Phase 3 reduction levels.
The EEXI represents the carbon intensity of a vessel, calculated as the ratio of CO2 emissions to the transport work performed. The fundamental formula is:
$$ \text{EEXI} = \frac{\text{Power} \times \text{SFC} \times C_F}{\text{Capacity} \times V_{\text{ref}}} $$

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