A novel multi-objective decision support method for ship energy systems synthesis to enhance sustainability

Trivyza, Nikoletta L.; Rentizelas, Athanasios; Theotokatos, Gerasimos

doi:10.1016/j.enconman.2018.04.020

Cited by 65 publications

(40 citation statements)

References 83 publications

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“…In this paper, we presented the clustering of the operations of the selected ship in "typical days" of operation. We consider this result of particular relevance, as it can be used by other researchers in studies related to the optimization of ship energy systems (such as, among others, [42,43]). It should be noted, however, that this relies on the assumption that the ship's operations remain constant over time, and that the analysis performed on one year of operations (in this case, the year 2014) is representative of future operations.…”

Section: Limitations and Future Workmentioning

confidence: 98%

Energy and Exergy Analysis of a Cruise Ship

et al. 2018

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In recent years, the International Maritime Organization agreed on aiming to reduce shipping's greenhouse gas emissions by 50% with respect to 2009 levels. Meanwhile, cruise ship tourism is growing at a fast pace, making the challenge of achieving this goal even harder. The complexity of the energy system of these ships makes them of particular interest from an energy systems perspective. To illustrate this, we analyzed the energy and exergy flow rates of a cruise ship sailing in the Baltic Sea based on measurements from one year of the ship's operations. The energy analysis allows identifying propulsion as the main energy user (46% of the total) followed by heat (27%) and electric power (27%) generation; the exergy analysis allowed instead identifying the main inefficiencies of the system: while exergy is primarily destroyed in all processes involving combustion (76% of the total), the other main causes of exergy destruction are the turbochargers, the heat recovery steam generators, the steam heaters, the preheater in the accommodation heating systems, the sea water coolers, and the electric generators; the main exergy losses take place in the exhaust gas of the engines not equipped with heat recovery devices. The application of clustering of the ship's operations based on the concept of typical operational days suggests that the use of five typical days provides a good approximation of the yearly ship's operations and can hence be used for the design and optimization of the energy systems of the ship.

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Section: Limitations and Future Workmentioning

confidence: 98%

Energy and Exergy Analysis of a Cruise Ship

et al. 2018

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“…These governing equations, from equation (2) to equation (10), have been used in the condensate pump energy and exergy analysis.…”

Section: Energy and Exergy Analysis Of Any Control Volumementioning

confidence: 99%

“…New systems for LNG carrier propulsion, partially based on steam turbines, are today under the development [8]. Such propulsion systems are very complex, so they require proper power management systems [9], decision support systems (usually multi-objective) [10] as well as appropriate maintenance systems [11]. Improvements on LNG carriers do not include only the propulsion system, but they also include optimal manipulation and management of the transported cargo [12].…”

Section: Introductionmentioning

confidence: 99%

Energy and Exergy Analysis of the Condensate Pump During Internal Leakage from the Marine Steam Propulsion System

2018

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A B S T R A C TAn energy and exergy analysis of the condensate pump from the marine steam propulsion system during the condensate leakage between pump stages is presented in this paper. Measurements from the steam propulsion system during exploitation were necessary for collecting all the data for the condensate pump analysis. Due to condensate leakage inside the pump casing, the producer specified condensate pressures at the pump outlet could not be obtained during the exploitation. Low condensate pressure at the pump inlet and condensate temperature slightly above the atmospheric significantly influences the pump exergy analysis. Increase in pump load resulted in an increase of pump energy and exergy losses and efficiencies. In the observed load range during the leakage, pump energy losses are between 19.88 kW and 24.78 kW, while pump energy efficiencies are between 11.12 % and 41.54 %. Pump exergy losses are slightly higher, while exergy efficiencies are slightly lower when compared to energy losses and efficiencies. During normal operation, without leakage, the pump energy efficiencies are from 5 % to 20 % higher in comparison with pump operation when the leakage occurs.

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“…These governing equations, from equation 2to equation (10), have been used in the condensate pump energy and exergy analysis.…”

Section: Energy and Exergy Analysis Of Any Control Volumementioning

confidence: 99%

Energy and Exergy Analysis of the Condensate Pump During Internal Leakage from the Marine Steam Propulsion System

2018

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An energy and exergy analysis of the condensate pump from the marine steam propulsion system during the condensate leakage between pump stages is presented in this paper. Measurements from the steam propulsion system during exploitation were necessary for collecting all the data for the condensate pump analysis. Due to condensate leakage inside the pump casing, the producer specified condensate pressures at the pump outlet could not be obtained during the exploitation. Low condensate pressure at the pump inlet and condensate temperature slightly above the atmospheric significantly influences the pump exergy analysis. Increase in pump load resulted in an increase of pump energy and exergy losses and efficiencies. In the observed load range during the leakage, pump energy losses are between 19.88 kW and 24.78 kW, while pump energy efficiencies are between 11.12 % and 41.54 %. Pump exergy losses are slightly higher, while exergy efficiencies are slightly lower when compared to energy losses and efficiencies. During normal operation, without leakage, the pump energy efficiencies are from 5 % to 20 % higher in comparison with pump operation when the leakage occurs.

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A novel multi-objective decision support method for ship energy systems synthesis to enhance sustainability

Cited by 65 publications

References 83 publications

Energy and Exergy Analysis of a Cruise Ship

Energy and Exergy Analysis of a Cruise Ship

Energy and Exergy Analysis of the Condensate Pump During Internal Leakage from the Marine Steam Propulsion System

Energy and Exergy Analysis of the Condensate Pump During Internal Leakage from the Marine Steam Propulsion System

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