Formula
Attained EEDI/EEXI scales as $P^{2/3}$ (numerator linear in P; $V_\text{ref}$ scales as $P^{1/3}$). Solve:
$$ k_\text{MCR} = \left(\frac{\text{EEXI}\text{required}}{\text{EEXI}\text{attained}^\text{before}}\right)^{3/2} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $k_\text{MCR}$ | Fraction of nameplate MCR retained | - | result |
| $\text{EEXI}_\text{required}$ | Compliance target | g CO₂ / (t·nm) | MEPC.328(76) |
| $\text{EEXI}_\text{attained}^\text{before}$ | Pre-limitation attained EEXI | g CO₂ / (t·nm) | ship design |
| $Reduction %$ | $(1 - k_\text{MCR}) \cdot 100$ | % | result |
Sources
- IMO MEPC.335(76) - EPL & ShaPoLi guidelines.
- IMO MEPC.328(76).
- IMO MEPC.1/Circ.850/Rev.3 - minimum propulsion-power floor.