Analysis of energy efficiencies of in-port ferries and island passenger-ships and improvement policies to reduce CO2 emissions

This study focuses on estimating CO2 emissions and analysing energy efficiencies using the Energy Efficiency Operational Index (EEOI) for ferries sailing within an urban port of Taiwan and passenger-ships operating on island routes surrounding Taiwan. A comparative analysis of energy efficiency para...

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Bibliographic Details
Published in:Marine pollution bulletin 2021-11, Vol.172, p.112826-112826, Article 112826
Main Authors: Chou, Chien-Chang, Hsu, Hsien-Pin, Wang, Chia-Nan, Yang, Tsun-Lirng
Format: Article
Language:English
Subjects:
Carbon dioxide
Carbon dioxide emissions
Comparative analysis
Diesel
Efficiency
Emissions
Energy
Energy efficiency
Ferries
High speed
Island country
Marine environmental policy
Passenger ship
Passenger ships
Policies
Sailing
Ship energy efficiency
Shipping emission
Ships
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Summary:This study focuses on estimating CO2 emissions and analysing energy efficiencies using the Energy Efficiency Operational Index (EEOI) for ferries sailing within an urban port of Taiwan and passenger-ships operating on island routes surrounding Taiwan. A comparative analysis of energy efficiency parameters showed that hybrid diesel-electric ferries had a 12% improved efficiency compared to the traditional full-diesel ferries, while high-speed passenger ships had up to 79% lower efficiency than medium-speed passenger ships. Some potential policies for reducing CO2 emissions from in-port ferries and island passenger-ships are presented based on these results. The estimated CO2 emissions from in-port ferries sailing within the urban port could be reduced by 10% when employing hybrid diesel-electric ferries instead of traditional full-diesel ferries. Emissions from island passenger-ships operating on island routes could be reduced by 11–26% through utilising small medium-speed passenger ships instead of small high-speed passenger ships and large passenger ships. •The EEOI values for small passenger ships are larger than those for large passenger ships.•Small passenger ships emitted actually lower total CO2 emissions due to their small capacity and short-distance navigation.•A hybrid diesel-electric ferryboat has lower EEOI value than that of a full diesel ferryboat.•Slow-speed navigation can increase the energy operational efficiency and reduce CO2 emissions from ships.
ISSN:0025-326X
1879-3363
DOI:10.1016/j.marpolbul.2021.112826