Nowadays, reducing pollutant emissions is of fundamental importance. In particular, in areas where urban public transport is carried out almost exclusively by boats, these represent the primary factors on which it is necessary to intervene. The conversion of current diesel units into hybridpropelled ones is essential to preserve the marina and the environment in areas considered UNESCO heritage sites such as Venice. This document concerns the study of the first hybrid vessel built for garbage collection in the old town of Venice. Paying attention to the system engineering innovations and the results of the tests carried out on board, the authors present some considerations regarding the changes necessary to convert the current diesel propulsion into a hybrid one, with the aim to enable navigation in Zero Emission Mode.
Emerging energy efficiency regulations and ongoing industrial studies are boosting the reduction of ship pollutant emissions. Researches are progressively stimulating innovation in energy efficiency management allowing the adoption of new technologies by shipowners. In order to find new strategies to reach Greenhouse Gas (GHG) goals, the IMO imposed new technical requirements to reduce carbon intensity by means the Energy Efficiency Existing Ship (EEXI) Index. This new technical measure is compulsory for existing ships. These indexes estimate grams of CO2 per transport work (g of CO2 per tonne-mile). For each vessel in operation an Attained EEXI must be calculated and benchmarked for compliance with a Required EEXI. The parameters that have the greatest impact on the determination of the Attained EEXI values will be assessed and compared the Required EEXI. Therefore, case by case, different technical solutions able to reduce the EEXI Exceedance percentage (i.e., the difference between the Attained EEXI and the Required EEXI) are tailored for each vessel with reference to the operating profile/scenario. Furthermore, in this paper a case study referred to a merchant fleet engaged in global operations is presented.
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