Rating and evaluation method of energy efficiency and carbon emission intensity of main propulsion diesel engines in operation ships

  Objectives  In order to establish a practical evaluation method and rating standard for energy efficiency and carbon emission intensity of main propulsion diesel engine(main engine) in operation ships,

  Methods  this paper uses the Specific Fuel Oil Consumption(SFOC) of main engine as the energy efficiency indicator, provides formulas for calculating the threshold of main engine energy efficiency at various level and the methods for calculating the energy efficiency level deviation coefficient, by which the level deviation coefficients of the energy efficiency level thresholds are determined, and the method, scope and principle of the energy efficiency evaluation are established. Moreover, the proposed methods are then applied to evaluate the energy efficiency of YUKUN ship based on the experiment data.

  Results  The calculation results reveals that the main engine's SFOC is 190.03 g/(kW·h), the thresholds of main engine energy efficiency for the 1st and 2nd grade is 191.86 g/(kW·h), and the 2nd and 3rd grade 203.15 g/(kW·h). The energy efficiency of YUKUN ship is then classified as the 1st grade.

  Conclusions  The results can effectively reflect the management level, technical status, energy efficiency level, and carbon emission status of YUKUN ship. The methods are in line with the requirements of the Asia-Pacific Energy Centre and other agencies in terms of objectivity, rationality, feasibility, systematism and guidance.