Accommodation Cooling Load • Moist-Air Ventilation Load • Chiller Duty • N+1 Capacity • Supply Airflow • AHU Capacity • Chilled Water Flow • Ambient Sensitivity

Ship HVAC Cooling Load, Chiller Capacity & Airflow Tool

Size and stress-test shipboard accommodation HVAC from the cooling load outward. Simple mode gives a fast summer capacity and airflow screen. Advanced decomposes each zone into transmission, solar, occupants, lighting, equipment, ventilation, infiltration and latent load, then checks chillers, AHUs, N+1 redundancy, chilled-water flow, condenser heat rejection and hot-weather sensitivity.

Figures represent
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Fast accommodation HVAC screen.The default summer basis uses ISO 7547:2022 values of 35°C / 70% RH outdoors, 25°C indoors and 8 L/s-person outdoor air. Adjust the inputs for the vessel specification, route and project design basis.
CoolingSensible + latent design load
AirflowSupply and outdoor-air demand
PlantChiller margin and CHW flow

Summer Design Case

m² of accommodation / conditioned spaces.
m.
°C.
% RH.
°C. Simple mode assumes 55% indoor RH.
persons.
L/s-person. ISO 7547:2022 default basis is 8.
W/m² planning factor. Advanced mode decomposes this.
°C leaving AHU / design supply air.
kW available at the entered design condition.

Plant Design Basis

°C.
%.
W/person, project input.
W/person, project input.
% effective. Enter zero if none.
% effective.
% applied to summed zone load. Project-specific.
% added after diversity.
% of design requirement after loss of largest unit.
°C.
°C.
K, for indicative heat-rejection flow.
% of estimated supply fan input reaching conditioned air.

Conditioned Zone Register

Boundary temperature can represent outside structure or a hotter adjacent space such as an engine room. Outdoor air is the greater of occupancy ventilation and exhaust make-up. Total supply airflow is the greater of sensible-load airflow, outdoor-air demand and entered minimum supply ACH.

UseZoneArea m²Height mPeopleIndoor °CRH %Boundary area m²Boundary °CU W/m²KSolar area m²Solar W/m²Shading %Lights W/m²Equipment W/m²Outdoor air L/s-pExhaust L/sInfiltration ACHSupply °CMin supply ACH

Chiller Register

Enter usable cooling capacity at the relevant evaporating/condensing design point or apply a user-entered derate. N+1 removes the largest available effective unit.

UseAvailable?UnitDesign capacity kWDerate %Max duty %Rated input kW

AHU / Supply Fan Register

Fan input is estimated from airflow × static pressure ÷ fan and motor efficiency. Available airflow is derated and limited by the entered maximum duty percentage.

UseAvailable?AHU / FanSupply m³/sDerate %Max duty %External static PaFan eff %Motor eff %
Engineering boundary: this is a load, airflow and plant-capacity planning tool. Vessel specification, flag/class requirements, fire-zone and smoke-control arrangements, equipment manufacturer selection data, duct pressure calculations, noise limits, hazardous-area requirements and commissioning measurements remain controlling.
Technical basis: ISO 7547:2022 is the current international standard for air-conditioning and ventilation design conditions and calculation basis for accommodation and other enclosed compartments on seagoing merchant ships. Its standard summer basis includes 35°C / 70% RH outdoor air, 25°C / 55% RH indoor air and at least 0.008 m³/s outdoor air per person unless the project basis states otherwise. ASHRAE shipboard guidance identifies solar radiation, transmission, occupants, lights and ventilation air as principal cooling-load components. The tool uses moist-air enthalpy for outdoor-air and infiltration loads, user-entered project factors for equipment-specific derating, and does not claim class or statutory approval.
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