Ship Fuel Consumption Analysis

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4.19 Optimization of ship fuel consumption
The OPEX of a ship are mainly dependent upon the following factors.
- Fuel consumption (FC) of ship’s main engine (ME)
- Fuel consumption of auxiliary engines (AE)
- The scheduled maintenance expenses
- The owner’s everyday expenses
While some regard that cost of loading and offloading of natural gas as the operating expenditures of ship.
As mentioned by Stopford, M., 2009, Vessel’s fuel bills consume almost 76% of sailing costs, and some other companies believe that the cost of fuel accounts for 60% of the total ship operating costs. Therefore, in order to reduce fuel consumption, minimizes the significant operation costs in a marine CNG transportation project. Experiments have shown that the decrease
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The Admiralty coefficient, which is commonly used in shipbuilding, illustrates the relationship of fuel consumption and vessel speed. The formula was initially used to determine the relationship between the force and displacement speed vessel. But it may also be used to compare values inter related with the power, for example, resistance to the hull or fuel consumption. Therefore, the formula described in the literature as the coefficient of fuel can be written: [Equation: 4.73]
Where,
EFC – fuel coefficient; – Ship displacement;
V – Ship speed;
EF – main engine fuel consumption.
As described above in formula, speed of the vessel appeared to the third power, is a dominant factor. This finding is consistent with the experience gained from the analysis as a test ship models and measurement of fuel consumption during operation of ships. Hence, the binomial power model must be applied in order to describe the daily fuel consumption and speed of the vessel: [Equation: 4.74] where: EFc – daily fuel consumption of the main engine for speed V [t];
V – speed of the vessel for which EFc is determined [kts]; x, y – parameters of the model; e – the error of term power regression
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Restricted or closed areas are those, in which the ship usually sails near the land. Marine Navigation is governed by a number of national and international regulations, including those that have significant effect on the speed of ship. In these areas, both the course and manoeuvers are forced to operate. Other processes can also be observed which limit the propulsive efficiency, in particular, the additional friction caused by the action of the shallow water. Captain decisions when navigating in confined areas, are primarily driven by the safety of sailing. Therefore, economic considerations become secondary in such

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