Evaluation of ship efficiency indexes

Figari, Massimo; D’Amico, Moreno; Gaggero, P

doi:10.1201/b11810-94

Cited by 3 publications

(5 citation statements)

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“…The concept of EEOI baseline can be useful to assess an “initial condition” to be used as future reference to verify improvements. As shown in Figari et al, 19 sister ships may have completely different EEOIs: in some cases, the difference is even 50%. The gap is due to the different operating conditions of the vessels, which means different trade routes, load conditions, sea states or different crew.…”

Section: Energy Efficiency Analysis From Operational Data Statisticsmentioning

confidence: 94%

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Numerical investigation on ship energy efficiency by Monte Carlo simulation

Coraddu¹,

Figari²,

Savio³

2014

Proceedings of the Institution of Mechanical Engineers, Part M:

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In this article, the authors present a procedure to predict the energy efficiency operational indicator by Monte Carlo simulations, estimating the total ship fuel consumption as a function of displacement and speed considered as random variables. To characterize the probability density function of displacement and speed, a complete series of operating data concerning 2 years of navigation, of a RoPax engaged in a commercial trade in the Mediterranean Sea, were collected and used.

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Section: Energy Efficiency Analysis From Operational Data Statisticsmentioning

confidence: 94%

“…18 The analysis of the various aspects affecting the carbon footprint of ships, in lieu of the recent MARPOL requirements, was carried out for two Italian shipping companies, and improvements of fleet energy management techniques were investigated. 7,19,20…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on ship energy efficiency by Monte Carlo simulation

Coraddu¹,

Figari²,

Savio³

2014

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…In addition, they are accountable for some 5-10% of acid rain in coastal regions (Corbett et al, 2007;Figari et al, 2011). Both national authorities and international organizations develop many restrictive regulations to reduce emissions from ships.…”

Section: Emissions From Shipsmentioning

confidence: 99%

“…Both indexes represent the ratio between emissions, in mass of CO 2 , and the quantity of transported cargo per sailed distance. Regulations were adopted as an amendment to MARPOL Annex VI in October 2010 (Figari et al, 2011;Greensmith, 2010).…”

Section: Emissions From Shipsmentioning

confidence: 99%

Thermodynamic analysis of a combined gas turbine power plant with a solid oxide fuel cell for marine applications

Welaya

Mosleh

Ammar

2013

International Journal of Naval Architecture and Ocean Engineeri

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Strong restrictions on emissions from marine power plants (particularly SO x , NO x ) will probably be adopted in the near future. In this paper, a combined solid oxide fuel cell (SOFC) and gas turbine fuelled by natural gas is proposed as an attractive option to limit the environmental impact of the marine sector. It includes a study of a heatrecovery system for 18 MW SOFC fuelled by natural gas, to provide the electric power demand onboard commercial vessels. Feasible heat-recovery systems are investigated, taking into account different operating conditions of the combined system. Two types of SOFC are considered, tubular and planar SOFCs, operated with either natural gas or hydrogen fuels. This paper includes a detailed thermodynamic analysis for the combined system. Mass and energy balances are performed, not only for the whole plant but also for each individual component, in order to evaluate the thermal efficiency of the combined cycle. In addition, the effect of using natural gas as a fuel on the fuel cell voltage and performance is investigated. It is found that a high overall efficiency approaching 70% may be achieved with an optimum configuration using SOFC system under pressure. The hybrid system would also reduce emissions, fuel consumption, and improve the total system efficiency.

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“…Measuring tools are important for implementing emission control policies and management plans. 7 The evaluation of these indices for particular vessels is of interest, 8 and sophisticated mathematical tools have been proposed to properly assess the reliability and carbon footprint of a shipping link. 9 In this framework, the efficiency of the electric generators 10 is an essential ingredient.…”

Section: Introductionmentioning

confidence: 99%

Analysis of key variables for energy efficiency in warships

Carrasco¹,

Bendaña

Paredes

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part M:

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The purpose of this work is to investigate the effect of environmental variables on the electric energy expenditure of a typical surface warship. Studies with similar objectives are much more frequent for merchant ships, but warship operations have peculiarities that will be emphasised. In particular, they spend large fractions of their life cycle at port, during which the vessel remains active. First, a discussion of the embarked systems is presented, pointing out the importance of auxiliary systems and, in particular, heating, ventilation and air conditioning. Quantitative estimates of the energy consumption of those systems are provided. Then, using data taken during real operations of a frigate of the Spanish Navy, correlations are computed between power consumption and different environmental variables. As a novelty, the analysis is carried out separating the different modes of operation of the ship. This leads to interesting conclusions, including a considerable positive correlation between seawater temperature and fuel consumption when the vessel is in port. The effect of a moored ship on the surrounding seawater temperature is studied by a numerical computation. The results suggest that the position of sea chests may be consequential for energy efficiency.

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Evaluation of ship efficiency indexes

Cited by 3 publications

References 0 publications

Numerical investigation on ship energy efficiency by Monte Carlo simulation

Numerical investigation on ship energy efficiency by Monte Carlo simulation

Thermodynamic analysis of a combined gas turbine power plant with a solid oxide fuel cell for marine applications

Analysis of key variables for energy efficiency in warships

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