Simple mode estimates available thermal energy from
main-engine fuel use, fuel heating value and the share
of fuel energy that can be recovered by the proposed WHR system.
MT/day
days
hours/day
%
MJ/kg
% fuel energy
Use a project-specific recoverable share after
temperature, pinch-point and equipment constraints.
Power Conversion
%
% gross power
g/kWh
% main fuel
Optional allowance for exhaust backpressure, pumping,
fan or other system effects not already included in
parasitic electrical load.
Fuel, Carbon & Maintenance
$
/MT
tCO2/MT
$
/tCO2
%
$
/MWh
$
/year
Project Investment
$
years
%
%/year
%/year
%/year
WHR Technology & Operating Profile
Enter the thermal power available from each waste-heat
source and the fraction that is practically recoverable
at the design operating point.
days
hours/day
%
Waste Heat Sources
kWth
%
kWth
%
kWth
%
kWth
%
Power Conversion & Fuel Penalty
%
%
% gross power
g/kWh
MT/year
%
Optional allowance for backpressure or other engine-side
effects not already represented by parasitic electrical load.
Fuel, Carbon & Maintenance
$
/MT
$
/MT
tCO2/MT
tCO2/MT
$
/tCO2
%
$
/MWh
$
/MWh
$
/year
Retrofit CAPEX
$
$
$
$
$
$
$
$
%
days
$
/day
$
Lifecycle Assumptions
years
%
%/year
%/year
%/year
$
Waste Heat Recovery ROI & Power Results
Simple waste heat recovery investment screen
Enter WHR data
Enter engine fuel use, recoverable heat, conversion efficiency,
fuel price and project cost to calculate marine waste heat
recovery power savings and ROI.
Annual Net Benefit
N/A
Fuel savings plus maintenance and carbon value
after WHR operating costs
Annual WHR Power Generation
N/A
Net recovered electricity after parasitic load
and system availability
Net WHR Power
N/A
Recoverable Thermal Power
N/A
Aux Fuel Avoided
N/A
Engine Fuel Penalty
N/A
Net Fuel Saved
N/A
Fuel-Only Savings
N/A
CO2 Avoided
N/A
Net Maintenance Effect
N/A
Installed Project Cost
N/A
Simple Payback
N/A
Project NPV
N/A
Internal Rate of Return
N/A
Lifetime ROI
N/A
Break-Even Fuel Price
N/A
Break-Even Annual Generation
N/A
Levelized Net Cost / MWh
N/A
Year 1 WHR Savings Breakdown
Waste Heat Recovery Investment Summary
Heat, Power & Fuel Balance
Annual operating case
Metric
Result
Lifecycle Cash Flow
Fuel, carbon and maintenance escalation included
Year
Fuel Savings
Maintenance Net
Carbon Value
Net Cash
Discounted
Cumulative PV
WHR ROI Sensitivity
Annual WHR utilization vs fuel price
WHR Utilization \ Fuel Price
-20%
Base
+20%
WHR estimate ready:
project guidance will appear after calculation.
Model approach:
simple mode converts main-engine fuel energy into a
user-entered recoverable heat fraction and then into electricity.
Advanced mode sums recoverable exhaust, jacket-water,
charge-air and other heat sources. Gross electrical output
is reduced by generator loss and parasitic demand. Annual
net electricity displaces auxiliary-generator fuel according
to entered SFOC, while an optional engine fuel penalty accounts
for backpressure or other WHR effects. Financial results add
maintenance effects and optional carbon value before calculating
payback, NPV and IRR.
Planning estimate only.
Actual marine waste heat recovery performance depends on
engine load, exhaust temperature and mass flow, cooling-water
temperatures, heat-exchanger approach temperatures, steam or
working-fluid conditions, fouling, backpressure, conversion
efficiency, generator loading, parasitic pumps and fans,
auxiliary-generator dispatch, vessel operating profile and
integration constraints. The tool does not replace a vessel
heat-balance study, OEM performance data, class review or
shipyard quotation.
