Heat Load • Infiltration • Product Pull-Down • Freezing Load • Compressor Capacity • N-1 Reserve • Cold Room Volume • Sensitivity

Marine Refrigeration Load, Compressor Capacity & Cold Room Sizing Tool

Estimate provision-room refrigeration duty from envelope heat gain, moist-air infiltration, product cooling or freezing, lighting, evaporator fans, personnel and defrost. Advanced mode links multiple cold rooms, product batches and compressor units, checks storage volume and N-1 capacity, and exposes the conditions most likely to push the plant beyond its available cooling margin.

Figures represent
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Use actual compressor performance at the intended evaporating and condensing conditions.Nameplate tonnage alone is not enough. Available cooling capacity changes with suction temperature, condensing temperature, superheat, subcooling and compressor condition. Enter the cooling capacity that is credible for the intended design condition.
LoadTransmission + infiltration + product + internal heat
CapacityPeak and daily-energy sizing checks
RoomStorage volume utilization

Cold Room & Ambient

m.
m.
m.
°C.
°C at the warm side of the insulation.
% RH, used for moist-air infiltration load.
% RH for infiltration enthalpy difference.
W/m²·K. Use a project-specific value.
Air changes/day. Planning input, not a universal standard value.

Product, Internal Load & Storage

kg/day.
°C.
kJ/kg·K. Simple mode assumes sensible cooling only.
hours.
kW from fans, lights and other loads represented as concurrent heat.
kg held in this room.
kg per m³ of gross room volume. User-entered.

Compressor Capacity Basis

kW at intended operating conditions.
h/day available for refrigeration duty.
% added to calculated requirement.

Plant Design Basis

h/day.
% applied after the governing load is identified.
% of summed room peak loads assumed simultaneous.
% of design requirement after loss of the largest available unit.
$/kWh for indicative compressor-energy cost.

Cold Room Register

Each room is evaluated for envelope transmission, psychrometric infiltration, lighting, evaporator-fan heat, personnel, defrost recovery and storage-volume utilization. Boundary temperature and U-value are vessel/project inputs.

UseRoomL mW mH mSetpoint °CBoundary °CU W/m²KEnvelope %Ambient RH %Room RH %ACH/dayStow kg/m³Stored kgLights kWLight h/dayEvap fan kWPersonsPerson h/dayW/personDefrost kWh/dayRecovery h

Product Load Register

Advanced product cooling is piecewise. If product crosses its freezing point, the model includes sensible cooling above freezing, latent heat of freezing, and sensible cooling below freezing. Respiration is optional and user-entered.

UseRoomProductkg/dayEntry °CTarget °CFreezing °Ccp above kJ/kgKLatent kJ/kgcp below kJ/kgKPull-down hResp. stored kgResp. W/t

Compressor / Condensing Unit Register

Enter OEM or measured cooling capacity at the intended evaporating and condensing conditions. The tool does not infer capacity from motor horsepower or refrigerant name.

UseAvailable?UnitCooling capacity kWDesign derate %Electrical input kW
Engineering boundary: this is a refrigeration load and capacity-planning tool, not an equipment selection certificate. Final compressor, evaporator, condenser, piping, refrigerant charge, machinery-room safety and food-storage requirements must follow the vessel specification, class/flag requirements, refrigerant safety rules and OEM performance data at the actual design conditions.
Technical basis: the load structure follows established refrigerated-facility practice: transmission through the envelope, infiltration/ventilation, product cooling/freezing, product respiration where applicable, people, lighting, evaporator fans and defrost. ASHRAE Handbook Refrigeration treats refrigerated-facility loads and marine refrigeration as separate specialist topics. Compressor capacity should be taken at the intended operating condition rather than assumed from motor size or nominal tonnage.
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