outdoor temperature; interpolation between temperature values may
be required to match a specific location. An approximation of
the appropriate outdoor temperature to use can be calculated as
the HDDs for a period divided by the number of days in that
period (typically a month). For additional accuracy,
temperatures can be calculated in this manner for consecutive
weeks or days and averaged over a month. Steam use is calculated
by multiplying the sum of the constant and intermittent loads by
the number of hours the ship received shore steam.
Metered Data. In many cases, a pier may be metered for
electricity or steam but individual ships are not. If only one
ship is at the pier, the metered data can be used to determine
the consumption by the ship. More often, several ships are at
the pier, all connected to a single meter. Using the data in the
ship's characteristics database (SHIPS) at
http://www.efdlant.navfac.navy.mil/LANTOPS_15/home.htm and CCB, consumption can be
prorated to the individual ships based on the metered total.
Using actual metered data in this manner is always recommended
over relying solely on the data from these tables.
Process for Estimating Ship Energy Consumption. The
following steps define the process for estimating ship energy
consumption using the forms shown in Tables 6 and 7. Related
ship service energy associated with pier operation such as pier
lighting, transformer losses, compressed air supply, and
sewer/water pumps that are not separately metered or accounted
for will be prorated to ships under this process. If this energy
is not to be prorated to ships, it must accounted for as an
additional line item in the reconciliation process (refer to
pars. 2.4 through 2.8).
a) Enter all metered ship data on the Table 6 form.
All that is required is the Ship Class/Name and the energy
consumption. This data accounts for all ship energy use that is
known and need not be estimated. If metering equipment or
readings are known to be inaccurate, the associated ship energy
use value should not be included.