Publications

Prpiæ-Oršiæ, J., Vettor, R., Guedes Soares, C. and Faltinsen, O.M. (2015) , “The influence of ship routes on fuel consumption and CO2 emission”, Maritime Technology and Engineering, Guedes Soares, C. & Santos T.A. (Eds.), Taylor & Francis Group, London, UK, pp. 857-864

The analysis of the various parameters influence, such as ship heading angle and weather conditions on ship fuel consumption and CO2 emission is presented. A reliable methodology for estimating the attainable speed in all range of sea states is described. The irregular sea is handled as a series of regular waves with different amplitudes and frequencies. The added resistance in regular waves is obtained by either a direct pressure integration method or an asymptotic small wavelength formula. The speed loss is calculated by taking into account the engine and propeller performance in actual seas as well as the mass inertia of the ship. The attainable ship speed is obtained as time series. Correlation of speed loss with sea states allows predictions of propulsive performance in actual seas. If the computation is used for weather routing purposes, values for various ship speed and heading for each realistic sea-state must be provided. To illustrate the presented concept, the ship speed and CO2 emissions in various routes of the Atlantic are calculated using representative environmental design data for the geographical areas where the ship will sail. The analysis has been done for various ship heading angles. The voluntary speed loss is taken into account. The influence of the ship speed loss on various parameters such as fuel consumption and emissions is presented.

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