Optimization of an Organic Rankine Cycle System for an LNG-Powered Ship

Jamin Koo, Soung-Ryong Oh, Yeo-Ul Choi, Jae-Hoon Jung and Kyungtae Park
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Jamin Koo: Department of Chemical Engineering, Hongik University, Seoul 04066, Korea
Soung-Ryong Oh: R&D Center, Gas Technology Compression Company, Changwon 52032, Korea
Yeo-Ul Choi: R&D Center, Gas Technology Compression Company, Changwon 52032, Korea
Jae-Hoon Jung: R&D Center, Gas Technology Compression Company, Changwon 52032, Korea
Kyungtae Park: Department of Chemical and Biological Engineering, Sookmyung Women’s University, Seoul 04310, Korea

Energies, 2019, vol. 12, issue 10, 1-17

Abstract: Recovering energy from waste energy sources is an important issue as environmental pollution and the energy crisis become serious. In the same context, recovering liquefied natural gas (LNG) cold energy from an LNG-powered ship is also important in terms of energy savings. To this end, this study investigated a novel solution for a LNG-powered ship to recover LNG cold energy. Six different organic Rankine cycle (ORC) systems (three for high-pressure dual-fuel engines and three for medium-pressure dual-fuel engines) were proposed and optimized; nine different working fluids were investigated; annualized costs for installing proposed ORC systems were estimated based on the optimization results. In addition, a sensitivity analysis was performed to identify the effect of uncertainties on the performance of the ORC systems. As a result, the ORC system for the medium-pressure engines with direct expansion, multi-condensation levels, and a high evaporation temperature exhibited the best performance in terms of exergy efficiency, net power output and actual annualized cost. These results demonstrate the possibility of replacing a typical LNG supply system with an ORC system.

Keywords: LNG-powered ship; lng fuel supply system; organic Rankine cycle; cold energy; optimization; particle swarm optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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