ASHRAE Journal - August 2013 - 34

technical feature

• Meet or exceed ASHRAE
Table 3 Indoor design considerations.
Standard 62.1 and industrySummer
WinTer
preSSure co 2 above Sound vibraTion lighT
Space
Summer
WinTer
ambienT level
level level
Temp.
Temp.
relaTionShip
standard sound, vibration, and
Type
humidiTy
humidiTy
(ppm)
(nc)
(in/Sec)
(Fc)
(°F)
(°F)
(pSi)
lighting requirements.
oFFice
75 ±2 40% ±15% 72 ±2
Float +0.01 to Hall
350
35
0.016
30
• Comply with all applicable
(Typical)
required local, state, and federal
open
cubeS, 1ST
75 ±2 40% ±15% 72 ±2
Float +0.01 to Hall
350
40
0.016
30
building codes.
Floor
• Be completed within the
open
owner’s stated budget and time
cubeS, 2nd
75 ±2 40% ±15% 72 ±2
Float +0.01 to Hall
350
40
0.016
30
Floor
requirements.
open
(Note: This list is based in
cubeS, 3rd
75 ±2 40% ±15% 72 ±2
Float +0.01 to Hall
350
40
0.016
30
Floor
part on NEBB’s unpublished
conFerence
sample OPR document “ABC
room
75 ±2 40% ±15% 72 ±2
Float +0.01 to Hall
350
35
0.016
30
Headquarters Office Building.”)
(Typical)
Negotiable and non-negobaThroom
75 ±2 40% ±15% 72 ±2
Float +0.01 to Hall
350
45
0.032
30
(Typical)
tiable requirements. The OPR
lunch
must also specify which require75 ±2 40% ±15% 72 ±2
Float +0.01 to Hall
350
45
0.032
30
room
ments are non-negotiable and
aTrium
75 ±2 40% ±15% 72 ±2
Float +0.02 to atm
350
45
0.032
30
must absolutely be satisfied—and
daTa
72 ±1 35% ±10% 72 ±1 35% ± 10% +0.01 to Hall
350
55
0.008
30
which requirements could be
cenTer
waived or modified if needed.
Vibration levels shown include values based on Sound and Vibration Design and Analysis; NEBB, 1st Edition (1994).
It’s an important consideration:
Adapted from NEBB’s unpublished sample OPR, p. 14.
During the project design phase,
Real-World Example
budget issues and timing constraints can develop—which
I was recently involved in commissioning a project that
could require the owner’s expectations to be modified. The
CxA must work with the owner to determine and describe had an extensive owner’s wish list.
Fortunately, the owner’s non-negotiable items were
the non-negotiable items that can never change, and
clearly defined. For example, the building had to be LEED
which items can change or be deleted.
Platinum certified, as a particular
As previously noted, a key reason the
Table 4 Warranty expectations.
donor had made a substantial contriOPR document is vital to project success
iTem
deSired WarranTy
bution toward achieving that objective.
is that the design team must understand
20 years (Leakage and
The project budget could not exceed
the owner’s requirements to create an
Roofing
Material Failure)
$10,000,000, and project completion
effective BOD document. An effective
10 Years
Windows
was targeted a year in advance to coinBOD document translates the designers’
(Trim and Glazing)
cide with a specific date. Invitations to
understanding of the OPR document
Sealants
2 Years
the building dedication ceremony were
into a coherent design plan that guides the
5 Years (Parts and
HVAC Compressors
Replacement Labor)
sent to local and national dignitaries a
construction process to ensure conforfull year in advance.
mance with owner expectations.
Water Heaters
5 Years (Parts)
It was a fast-track project in which
Having well-crafted OPR and BOD
Elevators
5 Years
construction began before the design
documents is not just a good idea—both
2 Years (Parts and
DDC System
Replacement Labor)
work was fully completed. As the
documents are increasingly becoming
Adapted from NEBB’s unpublished sample OPR, p. 11.
project moved through its design and
a requirement for modern construction
construction phases, the owner decided to increase the
projects. For example, the U.S. Green Building Council
scope of work. Architectural and mechanical requirements
(USGBC) requires both OPR and BOD documents for all
were adjusted, and the owner was able to secure additional
projects that are seeking LEED-NC certification (LEED
funding to meet the updated project goals.
2009).
34

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ASHRAE Journal - August 2013

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