Page 47: of Marine News Magazine (May 2019)

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INLAND PROPULSION

Fuel Cost: A detailed fuel consumption model was run on the operational pro? le. TSGI’s algorithm models various battery sizes, generators, mechanical system performance, and mechanical hybrid systems for comparison and optimi- zation. It uses the actual time data to establish fuel consump- tion, not an average of engine loads. This results in a more accurate modeling of fuel consumption and system optimi- zation. Calculations were compared with actual fuel con- sumption data for the pro? le to validate the methodology.

For these calculations the following assumptions were made: • Fuel Cost: $2.5/gallon • Urea Cost: $3/gallon • Urea Dosing Rate: 5%

The fuel savings for the DE/ES system is achieved mostly through the functions of peak shaving and ef? cient engine loading. By using peak shaving and dynamic response, the overall number of engine hours can be reduced. This has a large impact on the maintenance costs, as discussed further below. In this life cycle analysis, the initial capital cost of the

DE/ES system is nearly offset in the ? rst year of operations.

Annual Engine hours www.marinelink.com