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Updated: Jul 19, 2025

Implementation of Portable Emissions Measurement Systems PEMS for the Real-driving Emissions RDE Regulation in Europe
Published on: December 4, 2016
Characteristics of real-world ship energy consumption and emissions based on onboard testing
Ailong Fan1, Junhui Yan2, Yuqi Xiong2
1State Key Laboratory of Maritime Technology and Safety, Wuhan University of Technology, Wuhan, China; School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan, China; Academician Workstation of COSCO SHIPPING Group, Ltd, Shanghai, China.
Abstract:
The Yangtze River ships are generally overpowered and less energy efficient. In this study, a Yangtze ship was selected as the test ship, and its characteristics were investigated through energy consumption and emission testing under multiple operating conditions. The results show that the ship operates at 25-50 % engine load for 72.2 % of the time, and at this partial load, 9.72 % more CO2 and 9.81 % more NOX can be emitted than at the rated power. The concentrations of exhaust vary under different operating conditions. The emission factor of CO was the highest under departure conditions; CO2 and SO2 were the highest under anchoring conditions; and NOx was the highest under cruising conditions. The accuracy of the emission factors obtained by the direct calculation method was improved by 30 % compared to the concentration estimation method. This study can help understand the real level of energy consumption and emissions from in-service ships.
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