Korea Advanced Institute of Science and Technology · Engineering
Professor Daejun Chang's research lab specializes in maritime energy systems, with a focus on the thermodynamic, economic, and environmental optimization of liquefied hydrogen and natural gas propulsion and fuel supply systems for ships. The lab investigates innovative solutions for boil-off gas management, including re-liquefaction and fuel cell utilization, to enhance energy efficiency and reduce emissions. Key research directions include life-cycle cost analysis, energy efficiency design indices, and the development of sustainable propulsion strategies for zero-emission shipping.
Figures are computed from collected data and may differ slightly.
This study proposed a strategy for selecting an optimal propulsion system of a liquefied hydrogen tanker. Four propulsion system options were conceivable depending on whether the hydrogen BOG (boil-off gas) from the cryogenic cargo tanks was used for fuel or not. These options were evaluated in terms of their economic, technological, and environmental feasibilities. The comparison scope included not only main machinery but also the BOG handling system with electric generators. Cost-benefit analy
This paper proposes a methodology for economic evaluations of liquefied natural gas fuel gas supply (LNG–FGS) systems. To evaluate the economics of various LNG–FGS systems, expected operating expenditures during long-term voyages were compared, including the loss from venting boil-off gas (BOG) to prevent overpressurisation of the fuel tank, penalties for venting BOG, expenses for consuming marine diesel oil when LNG–FGS systems are unavailable, and expenses for electricity consumption. A second
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