Assessment of CO2 emissions for a bulk carrier fleet

Abstract

Recently, international regulations have started to come into force due to increasing of carbon dioxide (CO2) emissions as a greenhouse gas emission from ships. There are two important emission regulations which are European Union Monitoring, Reporting and Verification (EU-MRV) and International Maritime Organization Data Collection System (IMO DCS) as a Ship Energy Efficiency Management Plan (SEEMP) Part 2, became valid from 2018 to 2019, respectively. Both EU MRV and IMO DCS regulations are mandatory for the ships above 5000 GRT and examine CO2 emissions related to international shipping. Within this framework, the aim of this article involves to guide the shipping companies about energy efficiency and environmental management with comparing energy efficiency measures as novel Fleet Energy Efficiency Management Index (FEEMI), CO2 emissions, CO2 index and Energy Efficiency Operational Indicator (EEOI) values. In this study, firstly, operational energy efficiency values have been analyzed with a voyage details of five bulk carrier ships to assess the possible reasons of the changings by the years of 2017 and 2018. Furthermore, FEEMI have been defined as a novel energy efficiency indicator to evaluate the performance of the shipping companies. Lastly, different scenarios have been carried out to observe the effects of cargo carried capacity and fuel consumption amount on EEOI. As numerical results, the highest CO2 emissions and index values are found for ship C1 as 29,676 tonnes and 54,592 tonnes with 433 x 10(-3) tonnes CO2/nmile and 449 x 10(-3) tonnes CO2/nmile for the years of 2017 and 2018, respectively. Besides, the lowest energy efficiency operational indicator (EEOI) are calculated for ship C1 as 4.43 x 10(-6) tonnes CO2/MT.nmile and 5.06 x 10(-6) tonnes CO2/MT.nmile for the years of 2017 and 2018, respectively. (C) 2020 Elsevier Ltd. All rights reserved.