Plant Demand
Chilled-water flow, chiller electrical demand, auxiliary power and optional thermal-storage endurance
Ship Cooling Loads
Enter representative coincident thermal loads in kW of cooling.
The coincidence factor below is applied to the total entered load.
kW cooling
kW cooling
kW cooling
kW cooling
kW cooling
kW cooling
%
%
Chilled-Water Distribution
°C
°C
kW electric
Chiller Plant Configuration
chillers
chillers
kW cooling
% rated
Cooling kW divided by compressor electrical kW.
%
% design load
Casualty Load Priorities
Used only to estimate a theoretical shedding sequence after a chiller
casualty. These percentages are planning assumptions, not naval doctrine.
%
%
Optional Thermal Storage
MWh cooling
kW cooling
Individual Cooling Loads
Add major cooling consumers individually and assign coincidence and
casualty priority. Only rows marked Included are used.
Cooling Load
Thermal kW
Coincidence %
Priority
Included
Individual Chillers
Available capacity equals rated cooling × entered availability.
Chillers marked Available but not Online are treated as standby units.
Chiller
Rated kW
Available %
COP
Available
Online
Plant Design Criteria
%
%
% design load
Chilled-Water Distribution & Electrical Load
°C
°C
kW electric
MWh cooling
kW cooling
Naval Chilled-Water Plant Results
Aggregate cooling-load model
Enter plant data
Enter ship cooling loads, chiller capacities and redundancy assumptions
to estimate plant margin, flow, electrical demand and casualty performance.
Design Cooling Load
N/A
Coincident load including entered future growth margin
N+1 Cooling Margin
N/A
Cooling capacity remaining after loss of the largest online chiller
Coincident Cooling Load
N/A
Cooling Load in Refrigeration Tons
N/A
Online Cooling Capacity
N/A
Installed Available Capacity
N/A
Current Online Loading
N/A
Design Capacity Margin
N/A
Cooling Reserve Margin
N/A
Largest Online Chiller
N/A
Post-Loss Cooling Capacity
N/A
Casualty Cooling Shortfall
N/A
Required Chilled-Water Flow
N/A
Effective Online COP
N/A
Chiller Electrical Demand
N/A
Total Plant Electrical Demand
N/A
Minimum Chillers for Criterion
N/A
Thermal Storage Endurance
N/A
Cooling Load Breakdown
Advanced mode
Cooling Load
Connected kW
Coincidence
Coincident kW
Priority
Chiller Fleet Results
Advanced mode
Chiller
Rated
Available
COP
Status
Modeled Load
Unit Loading
Cooling Capacity & Redundancy
Casualty Cooling Screen
Load Composition
Design Margin Sensitivity
Cooling demand vs available chiller capacity
Demand \ Capacity
-10%
Base
+10%
Model approach:
coincident cooling demand is the sum of included thermal loads after
applying entered coincidence. Design load adds the entered growth
margin. Chiller available capacity equals rated cooling × availability
factor. Online loading equals current cooling demand divided by online
available capacity. N+1 capacity removes the largest online chiller.
Chilled-water flow uses Q = m × Cp × ΔT with water heat capacity of
4.186 kJ/kg-K. Chiller electrical power equals cooling load divided by
effective online COP, plus entered plant auxiliary power. Thermal
storage is applied only to a modeled post-casualty cooling shortfall.
Engineering planning estimate only.
This tool is not an approved naval electrical load analysis, chilled-water
balance, HVAC design, machinery-control analysis or survivability study.
Actual chilled-water demand depends on environmental conditions, seawater
temperature, equipment duty cycle, combat-system operating state, heat
rejection, ventilation mode, compartment conditions, fouling, condenser
performance, refrigerant condition, pump curves, valve position, hydraulic
balance and plant control logic. Redundancy requirements, casualty loading
priorities and mission-critical cooling criteria are vessel-specific.
Thermal storage calculations are simplified and do not account for heat
exchanger limits, stratification, minimum temperature, tank mixing or
control response. Validate final equipment sizing, piping, pumps, controls,
electrical loads, fault cases and redundancy with vessel-specific engineering
studies and approved design criteria.