Section 2: Individual LEED Credit Reviews
Table EA1-2
Additional Energy Efficiency Measures (EEMs) to Earn Three to Eight Energy Points (Office Building)
Energy Efficiency Measures Included (Marked 'X')
0.54
CO2
0.49
VFD
1.0
0.54
kw/ton
Sensor
Imprvmnt
Mod
kw/ton
Cooling
LEED
watts/SF Daylight
LEED
Occ
Prem Eff
kw/ton
Chiller
Energy Control
over
Cond
Chiller
Tower
Case
Rating
ASHRAE lighting dimming Sensors Motors
Points
Chiller
w/VFD
Recovery of O.A.
Boiler
w/VFD
Fans
Ref.
--
2
14.4%
min. fac.
Ref.
--
3
18.0%
full fac.
1B
Certified
3
17.7%
X
min. fac.
2B
Certified
5
25.6%
X
X
X
X
X
full fac.
3B
Silver
5
27.2%
X
X
X
X
X
min. fac.
4B
Silver
8
41.7%
X
X
X
X
X
X
X
X
X
full fac.
5B
Gold
7
35.4%
X
X
X
X
X
X
X
X
X
min. fac.
6B
Gold
8
41.7%
X
X
X
X
X
X
X
X
X
full fac.
Office Building EEMs
efficiency boilers of the baseline (3,800,000
BTU/h each) to four condensing boilers
The majority of the EEMs defined for the Office
(2,000,000 BTU/h each).
Building scenarios are the same as those defined
High-efficiency chillers (0.54 kw/ton) Cost
for the Courthouse. A description of the cost
premiums are defined to upgrade the two 330-
impact assumptions for the individual EEMs
ton centrifugal chillers. This chiller scenario is
follows:
used only in Case 2B (full faade renovation).
High-efficiency chillers (0.54 kw/ton) with
Reduced Lighting Power Density in offices,
variable frequency drives Cost premiums are
(1.0 watts/SF) As noted in the Courthouse
defined to upgrade the two 330-ton
descriptions, this measure is not expected to
centrifugal chillers. This chiller scenario is
add cost to the project.
used only in Case 3B (minimal faade
Daylight dimming systems at perimeter offices
renovation).
(both private offices and open office areas)
High-efficiency chillers (0.49 kw/ton) with
Cost premiums are defined for dimmable
variable frequency drives Cost premiums are
defined to upgrade the two 330-ton
used in the dimming system.
centrifugal chillers. This chiller scenario is
Occupancy Sensor controls for lighting in all
used in Cases 4B and 6B (full faade
enclosed offices and conference rooms Cost
renovation) and in Case 5B (minimal faade
premiums are defined for wall mounted
renovation).
sensors, and where applicable, for ceiling
Variable frequency drive cooling tower fans
mounted occupancy/daylight sensors.
No cost premium was identified for this
Premium efficiency motors Cost premiums
measure.
are defined for pump and fan motors.
Energy recovery Cost premiums are defined
Modulating condensing boilers (93 percent
to add enthalpy wheel heat recovery units.
nominal efficiency) Cost premiums are
The units are sized for a total of 29,500 cfm
defined to upgrade from the two standard
GSA LEED COST STUDY
77
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