MIL-HDBK-1133
c) Identify all metered and otherwise known energy
consumption quantities for buildings, ships, and other processes.
Include these quantities in Table 11 for all fuels.
d) In the appropriate component spaces, enter
estimated total consumption values for buildings and ships that
are not metered. Refer to Section 2 for calculation assistance.
e) Evaluate all miscellaneous energy use components
such as distribution losses, street lights, and other nonbuilding
loads. For each energy use, identify an estimated consumption
value by the best available method (refer to Section 2). Include
these values in Table 11.
f) Sum the energy component estimates and known
consumption for each fuel to derive the Estimated Total. Compare
these to the Billed Total consumption values entered in Step (b).
If any of the summed totals do not match, an adjustment or
correction is required.
If the difference is within 20 percent, it can be
considered reasonably accurate, given the many variables
affecting energy use. Major calculations and assumptions should
be rechecked for potential errors if the difference exceeds 20
percent. If errors are found or revisions to assumptions are
appropriate, the reconciliation should be recalculated with new
values. Any remaining difference may be attributable to weather
and operational factors that vary from installation to
installation and are not always accurately represented by the
estimation process.
g) The final reconciliation step eliminates any
remaining difference between the actual total consumption and the
summed estimates and metered values. This difference is
apportioned to energy use components by a percentage Adjustment
Factor calculated in Table 11. The Adjustment Factor is
determined by dividing the Difference (Billed - Estimated) by the
sum of selected Energy Use Components to which the difference is
to be apportioned (see equation in Table 11). For example, if
the difference is to be apportioned among all estimated
(nonmetered) buildings and ships, then the factor is the
difference divided by the sum of all Estimated Building Energy
and Estimated Ship Energy.
h) The Adjustment Factor value calculated in Table 11
is then multiplied by each of the selected Energy Use Components
to derive new estimates. These new values are reinserted in the
process (Table 11) and retotaled. At this point, the totals
should closely match, and all values should be checked to ensure
they are complete and reasonable.
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