친환경 전기추진 선박의 생애주기분석

This paper investigated the holistic environmental impacts for ships with electric propulsion using battery systems. It performed the comparative life cycle analysis among diesel, battery and fuel cell systems to determine whether hybrid technology would be excellent in the marine industry overall. A hybrid short route ferry, presently served in West Scotland, was chosen as the case vessel. Using the collected data, various scenarios were modelled in the platform of GaBi Software. Results revealed that battery electric propulsion could generally contribute to reducing environmental impacts; such as global warming potential, acidification potential and eutropication potential. On the other hand, research findings also pointed out that the degree of reduction in emissions would be significantly influenced by the ways of producing electricity. Given that different nations use different types/ratios of energy sources, emission levels vary across countries. For example, the same ship may lead to disparate results by producing 7.5 × 106 CO2 equivalent in UK but 2.3 × 107 CO2 equivalent in India. That means battery ships do not always necessarily guarantee cleaner shipping, given that a diesel ship may produce 1.78 × 107 CO2 equivalent. Such findings offer a meaningful insight into future policy making and regulatory frameworks.