Retrotec USACE - Manual (Page 67)

Chapter 5 45
the actual settings and actuator positions may be different from the readings
shown on the screen.
However, the BMS can and should be used to analyze the following issues
related to the energy-using systems:
Ventilation and air-conditioning setpoints and supply air temperatures ■
Time schedules for air handling units and lighting ■
Air handling process operation, use of simultaneous heating and cooling ■
Operation of fans and pumps (frequency drives, damper and valve con- ■
trols, VAV systems, etc.)
Room temperatures
■
5.7.10 Brainstorming Saving Measures
The energy assessment team should meet during the site work to discuss the
fi ndings, the problems, and special areas of interest. The meeting can take
place after each working day on site or after some specifi c sections of the site
have been visited.
The team should discuss the potential energy conservation measures and
decide who is going to look deeper into which measure. This is necessary to
avoid overlap in the auditors’ work.
If there are general, site-wide energy conservation measures (e.g., air han-
dling units running all the time), the team should decide at an early stage who
will write about this issue in the report and what information he or she needs
from other team members (e.g., which buildings this measure concerns, who
will calculate the building specifi c savings from this measure).
The team should ask these questions at the end of each day: Do we have the
information we need? What were the most interesting things we saw today?
The project manager should coordinate the work of the team members so
that, when the list of saving measures starts to formulate, it is clear to everyone
in the team who will process which measure further for the exit briefi ng and
who will write about it in the report.
5.7.11 Analysis of Energy Conservation Measures
The outcome of the Level I energy assessment is a preliminary list of energy
conservation measures. The walk-through type of energy assessment does not
allow accurate measurements or an opportunity to look for accurate data from
design documents, but it can produce rough ideas for saving measures and
calculations based on on-site observations. The saving potential is based on
assumptions, as is the estimation of investment needs; the payback times are
therefore not accurate.