1,808 research outputs found
ndagine mediante analisi per attivazione neutronica strumentale, del contenuto di alcuni elementi chimici in tetradrammi alessandrini di Nerone
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Il male, il fiore, il desiderio: sul Leopardi dell’ultimo Luzi
No full textL'intervento mira a descrivere e interpretare la presenza della poesia e del pensiero leopardiano nella fase finale della poesia di Mario Luz
ENERGY EFFICIENCY INDEX STATISTICAL ANALYSIS THROUGH VESSEL OPERATING DATA
No full textIMO is introducing two different emission indexes for a vessel: the Energy Efficiency Design Index (EEDI) and the Energy Efficiency Operational Indicator (EEOI). The former will be used to assess the design of the vessel, the latter would be used to evaluate the vessel in operation. Both indexes represent the ratio between emissions, in mass of CO2, and the transported cargo quantity per sailed distance. At moment an important debate is focusing on the definition of the 'baseline' values for different ship categories.
The operational indicator EEOI is a function of the vessel operating data. As showed in published works, sister ships may have completely different Energy Efficiency Operational Indicators, in some cases the difference is even 50%. This gap is due to the different operating conditions of the vessels, due to different trade routes, different load conditions and different sea states.
The Department of Naval Architecture, Marine Engineering and Electrical Engineering of the University of Genova carried out in the past a preliminary study aimed at evaluating the carbon footprint of RoPax vessels, and analysed various aspects affecting the carbon dioxide emissions from both technology and fleet energy management techniques points of view. Starting from that experience, the authors developed further activities, whose purpose was to evaluate the EEOI variability through the statistical analysis of the main operating variables of the vessel. A RoPax ship has been used as test case. For this ship a complete series of data concerning two years of navigation for the commercial trade in the Mediterranean Sea were collected. The results of the study are presented in the paper and could represent a useful support for the definition of the future IMO baseline, identifying a possible variation range of the efficiency indicator for a best practice managed RoPax ship
SHIP ENERGY ASSESSMENT BY NUMERICAL SIMULATION
No full textTraditionally, the environmental performance of marine systems in terms of exhaust emissions has never been among the primary concerns of the maritime industry. However, this situation is going to quickly change, as in the shipping sector Energy Efficiency Design and Operation IMO Indexes testify. In such a context it is worth mentioning that the greening of shipping operations can be effectively achieved by a suitable system design and energy management. Ship Energy Efficiency Management Plan (SEEMP) should be a tool to monitor and to optimize ship and fleet efficiency performance; as a consequence it will have a deep impact on the reduction not only of the exhaust gas emissions but also of the operational costs. To reach this goal energy modelling represents the keyword. In particular, the estimate by simulation, of onboard power generation, consumption and losses plays a fundamental role for driving, for instance, a decision support tool toward the optimal choices as far as energy management is concerned. To this purpose, in the paper the authors present the outcomes of the activities carried out to develop a simulation tool able to represent an overall ship system from the energetic point of view. Modelling approach and the results of numerical simulations performed by the authors to estimate vessel fuel consumption in a real case study are shown and discussed
LNG fueled barge for cold ironing: feasibility study for the emission abatement in the Port of Genoa
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