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INTERTANKO Safety, Technical & Environmental Committee 19 – 20 January 2009 Christian BREINHOLT

Attained and Required Energy Efficiency Design Index. INTERTANKO Safety, Technical & Environmental Committee 19 – 20 January 2009 Christian BREINHOLT Director Danish Maritime Authority. Proposed by Denmark Further developed by IMO Additional proposals by Denmark.

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INTERTANKO Safety, Technical & Environmental Committee 19 – 20 January 2009 Christian BREINHOLT

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  1. Attained and Required Energy Efficiency Design Index INTERTANKO Safety, Technical & Environmental Committee 19 – 20 January 2009 Christian BREINHOLT Director Danish Maritime Authority

  2. Proposed by Denmark • Further developed by IMO • Additional proposals by Denmark Attained and Required Energy Efficiency Design Index

  3. Objective • Require a minimum energy efficiency of new ships • Stimulate technical development • Separate technical and design based measures from operational and commercial measures • Compare the energy efficiency of an individual ship to similar ships which could have taken its cargo

  4. Attained Index • Cost: Emission of CO2 • Benefit: Cargo capacity transported a certain distance • Relates to a seagoing maximum condition

  5. Attained Index • CF: Conversion between fuel and CO2 • SFC: Specific fuel consumption • P, Vref and Capacity: A consistent set of engine power required to sail at a certain speed when the ship is carrying its capacity in calm weather • fw: Speed reduction in wind and waves • fi: Correction for any regulatory limitation on capacity

  6. CF • Conversion between fuel and CO2 • Non-dimensional • g CO2 emitted when burning 1 g of fuel • Refer to 2006 IPCC Guidelines (Intergovernmental Panel on Climate Change)

  7. SFC • Specific fuel oil consumption at engine power P • Measured in g/kWh

  8. P • Power of main and auxiliary engines • Including: • Propulsion related main and auxiliary power • Auxiliary power for main engine and accommodation • Excluding: • Cargo related auxiliary power • Measured in kW

  9. Contributions from all engines Main engines + Shaft motors - waste heat Auxiliary engines - Innovative energy efficient technologies in relation to main engine

  10. P • PMEi: 75 % MCR for each main engine • PPTi: 75% rated power consumption of shaft motors divided by 0.9 • Denmark propose that P for diesel electric driven ships is PPTi • PWHR: Rated electrical power generation at PMEi • Peff: Main engine power reduction due to innovative energy efficient technology • PAE: Required auxiliary engine power to supply Normal Maximum Sea Load when ship is under way

  11. PAE • For cargo ships with main engine power of 10000 kW or above: • For cargo ships with main engine power below 10000 kW:

  12. Ship specific corrections • The product of corrections to the main engine power to account for ship specific design elements such as ice strengthening

  13. Capacity • A measure of the benefit to society provided by the ship type • Deepest operational draught and associated trim to which a ship is allowed to be loaded • *Ro-ro Pax proposed capacity – Tonnage (GT)

  14. VRef • Ship speed • Measured in knots • Result of specified engine power, capacity draft and trim in deep water and calm weather – a consistent set of parameters • Can be provided by the ship builder early in the design stage based on model tests or calculations

  15. fw • Decrease of speed in representative sea conditions of wave height, wave frequency and wind speed (e.g. BF 6 – head wind). • Non-dimensional • Determined by ship specific simulation or standard values from a table • Japanese research project

  16. fi • Capacity factor for any technical or regulatory limitation on capacity feff • Availability factor of any innovative energy efficient technology.

  17. Attained Index * If shaft generator provided Normal Maximum Sea Load can be calculated using SFCME instead of SFCAE

  18. Attained Index Outstanding items to be addressed: • PAE for passenger ships • Verification of waste heat recovery contribution

  19. Average attained index for the world fleet Example: Dry bulk carriers Baseline

  20. Baseline • If the design of a ship makes it possible to fall into more than one of the above ship type definitions • the required energy efficiency design index for the ship the most stringent energy efficiency design index.

  21. Required Index • Attained index < Required index • A new ship shall be X % more efficient than the average of existing ships of the same type and size

  22. Base line and Required Index

  23. What if A ≥ R ? • Design cannot be approved • Improve design (hull, propeller etc.) to increase the speed available for the same engine size, or • Reduce engine size

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