Abstract
This paper presents the characteristics of ferry shipping with particular emphasis on large RoPax vessels operating in the Baltic Sea. A critical review of main propulsion system used on large RoPax ferries has been done. Optimal propeller parameters and required brake power have been estimated on the basis of total resistance of bare hull and appendages approximated according to Holtrop-Mennen method. Main engines and generating sets have been selected for minimized fuel consumption approximated with quadratic regression. Operational parameters and costs of analysed large RoPax main propulsion systems have been compared.
Highlights
Using the estimated values of effective power, optimum geometric and operating parameters of propellers as well as values of efficiency of propulsion systems with components and the required brake power were calculated according to the following formulae [16, 19]: CODAD propulsion system: (5)
Main engines and diesel generating sets were selected for the capacity to ensure the required brake power, minimise fuel
Selected models and the values of specific fuel oil consumption (SFOC) under service load in ISO ambient conditions are presented in Table 6 [23, 24]
Summary
Using the estimated values of effective power, optimum geometric and operating parameters of propellers as well as values of efficiency of propulsion systems with components and the required brake power were calculated according to the following formulae [16, 19]: CODAD propulsion system: (5). Multiplying the rated brake power of the Azipod by the product of the efficiencies of the propulsion system, according to equation (6), a correct value of effective power was obtained. By subtracting the latter value from the total value, it was possible to obtain a correct value of effective power for the diesel-mechanical part (9) and to determine the power split according to formulae (7) and (8).
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