Abstract
Limitation of CO2 emission is one of the main goals and regulations introduced by the international institutions’ rules. In the case of ships using oil-related and gas fuels this problem is dealt with by the International Maritime Organization (IMO) introducing the methodology of Energy Efficiency Operational Indicator (EEOI) determining for ships being under exploitation. The methodology allows for determining EEOI for seven types of ships, for which the value of this index depends on the amount of transported cargo or number of passengers, type of and amount of fuel used, as well as distance travelled by the ship. Such a methodology cannot be used for the specialized ships, whose exploitation tasks are different to the ships of the trade fleet that transport the cargo or the passengers. The methodology allows for determining EEOI for seven types of ships and it does not include specialized ships. The article presents a new methodology of determining EEOI for specialized ships that takes the characteristics of their exploitation into consideration. The way of its use has been presented taking into account the results of exploitation studies carried out on the chosen research and training ship. Obtained results and their analysis allowed for energy efficiency assessment of research and training ships depending on exploitation tasks, voyage time, type of fuel used, distance travelled and ship’s speed. EEOI index value determines energy efficiency of the vessel power system that is directly connected to the amount of the liquid or gas fuel used and the amount of emitted CO2. The aim should be to minimalize the value of EEOI index through planning of the exploitation tasks realization order and adjusting the speed of the ship as well as realization time of particular exploitation tasks, in the case of specialized ships. The analysis results can also be used when managing energy efficiency of these types of ships.
Highlights
The problem of the increasing level of greenhouse gases’ emission to the atmosphere which is an effect of the exploitation of ships has been analyzed by the scientific community and international institutions already for several years.Within the last fifty years the level of significance of the marine transport branch has considerably risen and has made it earn the reputation as the most efficient and eco-friendly type of transport in the world [1]
The determination of Efficiency Operational Indicator for Specialised Vessels (EEOISP) with varying hydrometeorological conditions can be done after the selection of measurement data; Difficulty in comparing exploitation tasks—due to the different combination of exploitation states with different significance levels occurring in the task and their course as a time function, the methodology is not recommended for comparative purposes of exploitation tasks; Determining the significance levels of exploitation states—determining the value of ps for individual exploitation states is associated with additional work; Data sensitivity—exploitation data related to the exploitation of a given ship, including primarily the duration of a given exploitation state, should be carefully collected and transmitted
The presented methodology of determining the energy efficiency of specialized ships fits into the EEOISP research stream devoted to the energy efficiency of the ships
Summary
The problem of the increasing level of greenhouse gases’ emission to the atmosphere which is an effect of the exploitation of ships has been analyzed by the scientific community and international institutions already for several years. The application of the methodology recommended by the IMO to determine the EEOI coefficient for specialized vessels is a problem due to the low or zero values of performed transport work, which may indicate inadequate values (with respect to the real ones) of the quantified level of ship’s energy efficiency. In the achieved Equation (3), the numerator’s identity was retained after the numerator from the popular formula for determining the EEOI [31], recommended by IMO i.e., no changes were made to indicate the CO2 emission level, because irrespective of the type of ship and the work done by it, during exploitation, it burns fuel and emits CO2 to the atmosphere. For the purposes of further research, the method of determining ps with the help of expert opinions was used
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