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Documentation Index

Fetch the complete documentation index at: https://docs.appliedaifoundation.org/llms.txt

Use this file to discover all available pages before exploring further.

Container ships and reefer vessels carrying refrigerated containers consume extra fuel to keep cargo cold. IMO MEPC.355(78) recognises this is cargo-related rather than propulsion-related, and lets operators strip those emissions from the Attained CII calculation.

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Formula

Reefer fuel (tonnes) = Cx × SFOC × Reefer-Hours / 1,000,000
Reefer CO₂ (tonnes)  = Reefer fuel × CF
Corrected Attained CII = (Total CO₂ − Reefer CO₂) × 10⁶ / (Capacity × Distance NM)

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IMO default constants

The platform uses the MEPC.355(78) defaults:
ConstantValueNotes
Cx (default reefer power)2.75 kWPer active reefer
SFOC (2-stroke engines)175 g/kWhDefault for container ships
SFOC (4-stroke engines)200 g/kWhAlternate, configurable
CF (HFO)3.114 t CO₂ / t fuelDefault
CF (MGO/MDO)3.206 t CO₂ / t fuelAlternative

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Inputs from the consumption log

The platform sums activeReefers × period across every report in the year to compute total reefer-hours. From there, fuel and CO₂ follow directly.

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What you see

On the vessel detail page, two CII numbers are shown side by side:
  • Database CII — what’s reported in the consumption logs (operator-supplied, may or may not include reefer correction depending on source)
  • Corrected CII — the reefer-corrected figure computed by the platform
A link opens the full MEPC.355(78) PDF in an in-app slide-out for reference.

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Implementation

src/lib/utils/ciiCalculator.ts — exports calculateReeferCorrection and calculateCIIWithReeferCorrection.

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Reference

  • IMO MEPC.355(78) — 2022 Interim Guidelines on correction factors and voyage adjustments for CII calculations
  • IMO MEPC.364(79) — CO₂ emission factors (Cf) for HFO and MGO