Fuel and CO₂ for a port call - aux hotel load, boiler duty, cargo-pump load.
Formula
$$ F_\text{aux} = \frac{(P_\text{hotel} \cdot h + P_\text{pump} \cdot h_\text{pump}) \cdot \text{SFOC}}{10^6} $$
$$ F_\text{boiler} = \frac{r_\text{boiler} \cdot h_\text{boiler}}{1000} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $F_\text{aux}$ | Auxiliary + pump fuel consumed at berth | t | result |
| $F_\text{boiler}$ | Boiler fuel consumed at berth | t | result |
| $P_\text{hotel}$ | Average hotel-load auxiliary power | kW | ship log |
| $P_\text{pump}$ | Cargo-pump or extra aux load during cargo ops | kW | ship / port log |
| $h$ | Hours alongside | h | port-call log |
| $h_\text{pump}$ | Hours of cargo-pump duty | h | cargo operation log |
| $h_\text{boiler}$ | Boiler-fired hours | h | ship log |
| $r_\text{boiler}$ | Boiler fuel rate | kg / h | NOx Technical File / maker data |
| $\text{SFOC}$ | Auxiliary SFOC at average load | g / kWh | NOx Technical File |
Per-fuel CO₂ is $F \cdot C_f$ from MEPC.364(79). If the ship is on cold ironing, set $P_\text{hotel} = 0$ and use the Cold ironing savings calculator instead.
Sources
- IMO MEPC.364(79) - Cf conversion factors.
- ESPO - port emissions inventories guidance.