3 Available effective power of wind propulsion systems
Clasification Society 2023 - Version 9.37
Statutory Documents - IMO Publications and Documents - Circulars - Marine Environment Protection Committee - MEPC.1/Circular.815 – 2013 Guidance on Treatment of Innovative Energy Efficiency Technologies for Calculation and Verification of the Attained EEDI – (17 June 2013) - Annex 11 – Guidance on Calculation and Verification of Effects of Category (B) Innovative Technologies - Appendix 2 – Wind Propulsion System (Category (B-2)) - 3 Available effective power of wind propulsion systems

3 Available effective power of wind propulsion systems

  3.1 The available effective power of wind propulsion systems as innovative energy efficient technology is calculated by the following formula:

  • Where:

  • .1 (feff * Peff) is the available effective power in kW delivered by the specified wind propulsion system. feff and Peff are combined in the calculation because the product of availability and power is a result of a matrix operation, addressing each wind condition with a probability and a specific wind propulsion system force.

  • .2 The factor 0.5144 is the conversion factor from nautical miles per hour (knots) to metres per second (m/s).

  • .3 Vref is the ship reference speed measured in nautical miles per hour (knots), as defined in the EEDI calculation guidelines.

  • .4 ηT is the total efficiency of the main drive(s) at 75 per cent of the rated installed power (MCR) of the main engine(s). ηT shall be set to [0.7], if no other value is specified and verified by the verifier.

  • .5 F(Vref)i,j is the force matrix of the respective wind propulsion system for a given ship speed Vref.

  • .6 Wi,j is the global wind probability matrix (see below).

  • .7 P(Vref)i,j is a matrix with the same dimensions as F(Vref)i,j and Wi,j and represents the power demand in kW for the operation of the wind propulsion system.

  3.2 The first term of the formula defines the additional propulsion power to be considered for the overall EEDI calculation. The term contains the product of the ship specific speed, the force matrix and the global wind probability matrix. The second term contains the power requirement for the operation of the specific wind propulsion system which has to be subtracted from the gained wind power.

Parent topic: Appendix 2 – Wind Propulsion System (Category (B-2))
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