Retrotec USACE - Manual (Page 62)

40 ENERGY & PROCESS ASSESSMENT PROTOCOL
Water suppliers may have different tariffs. The costs and consumption
should be analyzed. Typical questions for the cost analysis are
What are the elements in the tariff? Is there a cost for water supply and ■
sewage water? What are the fi xed costs?
How does the consumption vary in the winter and summer months?
■
How much water is used in production processes? Does the water con- ■
sumption refl ect the changes in the production?
Is water used for cooling purposes or to supply water to cooling towers?
■
Is the cooling demand constant?
Could cooling water be recycled or is closed-circuit cooling possible?
■
Is there waste heat from processes available for preheating domestic or ■
process hot water?
5.7 Assessment Work On Site
The aim of the site work is to
Go through the most important energy-using systems, processes, and ■
equipment
Gain understanding of the energy usage on site, the operating routines,
■
and user behavior
Generate preliminary ideas for energy conservation measures.
■
List areas and processes for which additional quantitative data is ■
needed for later analysis
5.7.1 Working Procedure On Site
The site visit should follow a systematic procedure instead of a random walk-
through, which is typically used for identifying easy and quick saving measures. If
the saving possibilities are analyzed in more detail, the energy assessment should
be based on a systematic check of the most critical areas of energy use.
Usually the energy assessment team has a limited time for the site visit and
therefore must concentrate on main areas of energy production, distribution,
and use. The key elements to check are related to the energy production and
effi ciency and to the main consumers (energy-using system operation, settings,
controls, patterns of use).
5.7.2 Level I Assessment
Check these items during site assessment (using building automation systems
and the walk-through assessment):