ISO 8861 Air Balance, Combustion Air, Machinery Heat Rejection, Supply / Extract Fans, Free Area & Fan Power
Ship Engine Room Ventilation, Combustion Air, Heat Load & Fan Sizing Tool
Build the machinery-space air balance from combustion demand and heat rejection, identify whether the ISO heat-evacuation check or the 1.5× combustion-air floor controls, size the final supply airflow and fan power, then test supply and extraction capacity with redundancy, free-area, air-change and retrofit-energy screens.
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Add a machinery / heat-source register, supply and extraction fan banks, one-fan-out capacity, louver free area, engine-room pressure balance, annual fan energy, retrofit cost and readiness checks.
Fast ISO 8861 Air-Balance Screen
The default combustion-air coefficient is a planning value for a 4-stroke diesel. Manufacturer combustion-air and heat-emission data should replace generic guidance when available.
m³.
kW total in the design condition.
kg/(kW·s). OEM value preferred.
m³/s for boilers / other consumers.
kW sensible heat released to the space.
kg/m³.
K above intake air.
% above governing base airflow.
Pa across intake, ducts, dampers, filters and louvers.
% for preliminary electrical input power.
Design Conditions & ISO Logic
m³.
°C.
K.
kg/m³.
kJ/(kg·K).
%.
1.50 = combustion airflow plus 50%.
% of combustion airflow deducted from gross thermal airflow in the heat term.
%. Remaining air exits by leakage / natural relief and supports positive pressure.
Machinery & Heat-Source Register
Diesel rows calculate combustion airflow from power × load × air requirement unless direct combustion airflow is entered. Heat emission is an explicit OEM / project input. Row labels are not submitted to Ship Universe Tool Data.
| Equipment | Type | Qty | Power each kW | Load % | Air kg/kW·s | Direct combustion m³/s each | Heat each kW | Sim % | Inside ER? |
|---|
Supply Fan Bank
m³/s.
Pa.
%.
%.
m³/s, optional retrofit comparison.
m/s, editable project/vendor screen.
Extraction Fan Bank
m³/s.
Pa.
%.
%.
m³/s, optional.
m/s, editable project/vendor screen.
Retrofit Energy & Cost
h/year.
% of modeled design electrical input.
Selected currency / kWh.
kWh/year, optional retrofit baseline.
%.
Ventilation-System Readiness
Ventilation screening only: this tool is not a class-approved HVAC design, CFD air-distribution study, duct-network calculation, fire-damper design, hazardous-area ventilation study, fan acoustic analysis or equipment-temperature guarantee. Manufacturer combustion-air and heat-emission data should take precedence over generic guidance. Final fan duty also requires the real duct, louver, damper, filter, silencer and weather-protection pressure losses.