Ingangsdatum: 12-10-2012
2 - Method of calculation
2.1 Three kinds of standard fw
curves are provided for bulk carriers, tankers and containerships,
and expressed as a function of Capacity defined in the 2012
Guidelines on the method of calculation of the attained Energy
Efficiency Design Index for new ships (EEDI), adopted by
MEPC.212(63). Ship types are defined in regulation 2 in Annex VI to
the International Convention for the Prevention of Pollution from
Ships, 1973, as modified by the Protocol of 1978 relating thereto,
as amended by resolution MEPC.203(62).
2.2 Each standard fw curve has
been obtained on the basis of data of actual speed reduction of
existing ships under the representative sea condition in accordance
with procedure for deriving standard fw curves.
(see appendix 2.)
2.3 Each standard fw curve is
shown from figure 1 to figure 3, and the standard
fw value is expressed as follows:
standard fw value = a x
ln(Capacity)+ b
where a and b are the parameters given in table
1.
Table 1: Parameters for determination of standard fw
value
| Ship type | a | b |
| Bulk carrier | 0.0429 | 0.294 |
| Tanker | 0.0238 | 0.526 |
| Containership | 0.0208 | 0.633 |
fw = 0.0429ln(Capacity)+0.294
Figure 1: Standard fw
curve for bulk carrier
fw =
0.0238ln(Capacity)+0.526
Figure 2: Standard fw curve for
tanker
fw =
0.0208ln(Capacity)+0.633
Figure 3: Standard fw curve for
containership