Retrotec USACE - Manual (Page 47)

Chapter 3 25
The existing systems and equipment and their operation and maintenance
are analyzed, and new practices and technologies are considered. If the con-
sumption fi gures are not available (e.g., due to the absence of metering), the
Level I assessment can be based on analysis and estimates by experienced
auditors.
A Level I assessment would normally recommend that the installation per-
form some metering, which could be followed by a Level II assessment to
verify the Level I assumptions, and to more fully develop the ideas from the
Level I screening analysis.
3.6.2 Level II Assessment
Level II assessment is characterized by more detailed measurements (e.g.,
submetering, temperatures, operation times), preferably on an hourly basis,
and detailed simulations of the energy consumption by the building and its
equipment.
Based on the results of the Level I analysis, the main objective of the Level II
analysis is to make the energy usage more transparent, to understand selected pro-
cesses better, and to determine the saving goals by adapting the energy consump-
tion to the actual energy demand of the building under its specifi c utilization. Thus
the model used shall be able to describe the energy fl ows in the building (building
site) in a realistic way, and the measurements shall concentrate on those processes
and effects that cannot be interpreted easily.
3.6.3 Level III Assessment
Finally, the Level III assessment is a detailed engineering analysis with imple-
mentation, performance measurement, and verifi cation (M&V) assessment
and fully instrumented diagnostic measurements (long-term measurements).
This level takes 3–18 months to accomplish. For ESPC projects, the Level III
assessment is extended until the end of the contract to guarantee that all sys-
tems and their components operate correctly.
Table 1 shows composition and thoroughness of auditing activities for the
different auditing levels.