Hull Resistance Reduction, Air Supply & Retrofit Economics
Air Lubrication System Net Fuel Savings, Compressor Load & Retrofit ROI Tool
Separate gross hydrodynamic savings from the electrical energy required to make the air layer. Model sea-state and operating-condition performance, compressor air demand, N+reserve capacity, generator margin, off-state outlet drag, net fuel and CO₂ reduction, retrofit capex, payback and multi-year NPV.
Vessel, Hull & Fuel Baseline
IMO GreenVoyage2050 identifies flat-bottom area, wetted area, draft and speed among the factors that influence ALS potential. Use vessel-specific trial, CFD or vendor data for the gross reduction input whenever available.
g/kWh
g/kWh
$
/ t fuel
tCO₂/t fuel
$
/ tCO₂
% prop. power
Optional planning allowance when ALS is unavailable or switched off.
m²
m²
%
%
Operating Condition
days/year
knots
kW
%
Gross hydrodynamic benefit before compressor and ALS auxiliary energy.
%
m³/min
Annual ALS Operating Profile
Use separate rows for laden / ballast, slow steaming, high-speed or other conditions where propulsion demand, achievable gross drag reduction or required air flow changes materially.
| Condition | Hours / yr | Speed kn | Propulsion kW | Gross reduction % | Air demand m³/min | ALS availability % |
|---|
Compressor Plant & Electrical Capacity
Planning reserve only. Enter the redundancy philosophy required by the project.
m³/min
kW
%
Adjusts the simple rated kW / rated flow relationship for part-load and system losses.
kW
%
kW
kW
Retrofit Cost & Investment Case
$
$
$
$
$
$
days
$
/ day
$
years
years
%
Engineering and commercial screening only: This tool does not replace CFD, model testing, full-scale trials, compressor selection, machinery heat-balance review, electrical load analysis, hull structural design, piping calculations, class approval or statutory certification. Manufacturer performance guarantees and in-service verification should govern the final investment decision.