Eco-efficient marine power system with cooled air ventilation by waste LNG cold energy for reefer holds in an ultra-large container ship

Ahn, Junkeon; Park, Sung Ho; Jeong, Jinyeong; Lee, Sanghyuk; Ryu, Juyeol; Park, Jong-Po

doi:10.1016/j.jclepro.2021.129037

Cited by 7 publications

(2 citation statements)

References 16 publications

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“…Regarding the investigations exploring how LNG can be used in air-conditioning systems, fewer studies have been found for the shipping sector, whereas many others concerning the supply of district cooling in LNG terminals are available. A specific application was conducted in [25]: the authors studied the potentiality of the LNG cold energy to cool the cargo holds in an ultra-large container ship by producing a cooled air ventilation stream starting from the regasification process. Results highlighted that the recovery of the cold energy allowed for improving the marine power system due to the more efficient propulsion determined by the power saving required from the airconditioning system, which allows for gaining power output at the vessel shaft.…”

Section: State Of the Artmentioning

confidence: 99%

Energy and Exergy Analyses of an Innovative Heat Recovery System from the LNG Regasification Process in Green Ships

Bruno,

Ferraro,

Bevilacqua

et al. 2024

Preprint

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Despite being stored at 113 K and atmospheric pressure, LNG cold potential is not exploited to reduce green ships’ energy needs. An innovative system based on three Organic Ranking Cycles integrated into the regasification equipment is proposed to produce additional power and recover cooling energy from condensers. A first-law analysis identified ethylene and ethane as suitable working fluids for the first and the second ORC making available freshwater and ice. Propane, ammonia and propylene could be arbitrarily employed in the third ORC for air-conditioning. An environmental analysis that combines exergy efficiency, ecological indices and hazard aspects for marine environment and ship’s passengers, indicated propylene as safer and more environmentally friendly. The exergy analysis confirms more than 20% of the LNG potential can be recovered from every cycle to produce a net clean power of 76 kW, whereas 270 kW can be saved by recovering condensers' cooling power to satisfy some ship needs. Assuming the sailing mode, a limitation of 162 kg in LNG consumptions was determined, avoiding the emission of 1584 kg of CO2 per day. Marine thermal pollution is reduced by 3.5 times by recovering the working fluids' condensation heat for the LNG pre-heating.

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Section: State Of the Artmentioning

confidence: 99%

Energy and Exergy Analyses of an Innovative Heat Recovery System from the LNG Regasification Process in Green Ships

Bruno,

Ferraro,

Bevilacqua

et al. 2024

Preprint

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“…The authors also showed that the proposed system allows the of free cooling for onboard demand, such as air conditioning, food conversation, or even additional engine enhancement. Ahn et al [16] investigated cooled air ventilation, linked to a marine power system, that recovers LNG waste cold heat produced during LNG vaporization for removal of dissipated heat from reefer containers. The authors concluded that this type of system could increase the electric efficiency of the ship.…”

Section: Fig 1 Number Of Lng-powered Vessels From 2010 Tomentioning

confidence: 99%

Possibility of Utilizing LNG Cold Waste Heat on the Container Ship

Stjepan¹,

Herceg²,

Boban³

et al. 2022

Preprint

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Stricter ecological standards in combination with increasing demand for transportation of perishable cargo, demand changes in shipping industries in the years to come. Until more ecological power systems are implemented, increasing energy efficiency, and reducing carbon footprint have become a priority for shipping industries. Due to smaller greenhouse gas emissions, LNG-powered vessels are gaining more attraction and when LNG is used, considerable waste cold energy can be utilized. In this research, waste cold heat of LNG is used for precooling of outside air for cargo hold ventilation. It is shown that by precooling the air with LNG waste cold heat, the energy consumption of transported refrigerated containers can be reduced up to 25%.

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Optimization of the design of photovoltaic-based seaport microgrids considering techno-economic and environmental criteria

Binot,

Meunier,

Reinbold

et al. 2024

Energy Reports

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Eco-efficient marine power system with cooled air ventilation by waste LNG cold energy for reefer holds in an ultra-large container ship

Cited by 7 publications

References 16 publications

Energy and Exergy Analyses of an Innovative Heat Recovery System from the LNG Regasification Process in Green Ships

Energy and Exergy Analyses of an Innovative Heat Recovery System from the LNG Regasification Process in Green Ships

Possibility of Utilizing LNG Cold Waste Heat on the Container Ship

Optimization of the design of photovoltaic-based seaport microgrids considering techno-economic and environmental criteria

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