The EMIS Audit

4.4.3 Utility Distribution Constraints
In the previous two stages, the EACs have been defined on an ideal basis, taking
into consideration both the process and the organisational demands. It is at this
point that compromises away from the ideal situation start to occur. The first
constraint is likely to be the layout of the utility distribution s ystems which may limit
the ability to devise a metering s ystem allowing the measurement of all utilities flows
(or indeed utility drivers) into and out of an EAC.
If this situation occurs it may be necessary to consolidate EACs into larger
groupings, if that allows the energy flows or utility driver s to be measured.
4.4.4 The Sanity Check
The final check on the Energy Account Centre structure, happens after the metering
and data capture assessment. As will be explained later, one of the purposes of the
metering and data capture assessment is to determine any changes to energy or
utility driver metering.
If the number of meters, and hence the probable cost of the new meters, is high it
may be difficult to justif y their inclusion on the EMIS s ystem on the grounds of the
potential cost savings alone. Again the solution in this situation is to consolidate
EACs, looking at those EACs with the smallest potential consumption first.
Figure 16. Site broken down into Departments and EACs
Site
Department 1
Steam
Department 2
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Energy account centre 1 Σ� Target = fn(Prod, T, RH?)
Electricity
Natural Gas
Energy account centre 2
Energy account centre 3
Department 3, etc
4.5 Metering and Data Capture Assessment
Calculate:
• Actual Energy
• Target Energy
• Energy Variance
• Actual Cost
• Target Cost
• Cost Variance
• Cusum
Metering and Data Capture comprises the elements of the Energy management
information s ystem that provide the raw data for analysis and therefore
encompasses the energy meters and other process sensors and the data capture
systems. This assessment follows on from the definition of the Energy Account
centres and asks the question – does the site have sufficient meters of a good
enough quality in order to provide robust measurements of energy flows into each of
the Energy Account Centres identified?
EMIS Ma nu al Page | 33
Part A
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