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The second step entails a review of the results from Step
1 with the Property Owner / Management to define their expectations
or desires as to return on investment and energy efficiency.
Where Central Plans are involved, BAS system payback is usually
related to energy reduction of central plan operation, with
control of common area lighting and HVAC units being evaluated
as marginal added cost.
When the project does not include a Central Plan, the cost
of a BAS cannot usually be justified strictly on payback since
common area energy charges are a pass-through to tenants.
Typically, if the payback is less than two or three years,
the BAS costs can be recovered through energy savings by some
sort of shared savings or system lease arrangement.
For longer payback periods, the property Owner has to absorb
at least some portion of the BAS cost on the basis that reduced
common area costs will ultimately result in higher rents.
In any event, the result of Step 2 is a clear understanding
of what the BAS is to accomplish.
Step III
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The third step is to prepare a bid package and/or request
for proposal, which is submitted to creditable control
system contractors or vendors.
The bid package is typically centered on a performance
specification, which defines what the BAS is to accomplish
together with basic acceptable control methodologies.
This is fairly generic in nature so as to allow control
system vendors as much freedom as possible in selecting
"how-to-do-it"
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