Section 2: Individual LEED Credit Reviews
LEED Credit EQ-1:
potentially provide energy savings (see "Synergistic
Credits" below).
Carbon Dioxide Monitoring
Basis for Cost Assumption
For the Courthouse model, a total of forty-five
Intent
carbon dioxide sensors are installed. Targeted
Provide capacity for indoor air quality (IAQ)
spaces include courtrooms, jury rooms, judge's
monitoring to help sustain long term occupant
chambers, conference rooms, the cafeteria, the Jury
comfort and well-being.
Assembly room, and a few additional spaces at the
end of duct runs.
Requirement
For the Office Building model, a total of sixty
Install a permanent carbon dioxide (CO2)
carbon dioxide sensors are installed. Targeted
monitoring system that provides feedback on
spaces include conference rooms, open office areas
space ventilation performance in a form that
at the end of duct runs, and a few miscellaneous
affords operational adjustments. Refer to the
spaces.
CO2 differential for all types of occupancy in
For the purposes of the study, the CO2 sensors are
accordance with ASHRAE 62-2001,
assumed to interface with the BMS only to display
Appendix D.
sensor readings. The estimates do not assume that
(1 point)
the BMS is programmed to provide automatic
outside air damper control based on CO2 sensor
input (this level of control is assumed in Credit
Cost Impact = 4
EA-1 the "Synergistic Credits" identified below).
Summary of First Cost Impacts
1
2
3
4
5
GSA
No
Low
Moderate
High
Courthouse (New Construction, 262,000 GSF)
Standard
premium,
premium
premium
premium
(no cost)
psble svgs
(<50K)
(50-150K)
(>150K)
Total Credit Cost........................................ ,876
Cost Impact ($/GSF) ..........................
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.25/GSFPractical Applications
Cost Impact (%) ............................................ 0.11%
To achieve this credit, carbon dioxide sensors are
Office Building (Modernization, 306,600 GSF)
installed in selected spaces within a building to
monitor the ventilation system performance. High
Total Credit Cost........................................ ,556
concentrations of CO2 generally indicate that the
Cost Impact ($/GSF) ..........................
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.30/GSFamount of outside air delivered to a space is
Cost Impact (%), Min. Facade .................... 0.24%
inadequate for the number of occupants (due to
Cost Impact (%), Full Facade......................0.23%
improper air balancing, improper setting of the
outside air dampers, or other issues). Targeted
spaces include those with variable occupancy (e.g.,
Additional Considerations
courtrooms, conference rooms, cafeterias), and
spaces served by the longest lengths of ductwork.
Carbon dioxide sensors require initial and ongoing
The credit does not require that the CO2
calibration to perform effectively. For the purposes
monitoring system provide automatic outside air
of the study, a five-year calibration sensor is the
damper control (typically through tie-ins with the
assumed standard, in order to minimize
building management system[BMS]); however, this
maintenance requirements.
strategy may be pursued in many projects to
provide better ventilation control, and to
GSA LEED COST STUDY
133
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