Washington Headquarters Services (BRAC 133) achieved a 46 percent
energy reduction through the use of energy efficient design strategies.
The strategies implemented were efficient chillers, reduced lighting and
a high-performance envelope. These efforts allowed the opportunity to
meet the requirements for Design to Earn Energy Star certification.
The highly efficient chilled water system incorporates desiccant wheels
that will recycle latent energy. Other measures such as dedicated out-
door air and demand-controlled ventilation assist with energy reduction
of the mechanical system.
Lighting is one of the largest energy consumers in a building. Lighting
energy was reduced 30 percent by reducing lighting power densities
and introducing natural daylight. The lighting power density was re-
duced by the use of light-emitting diode (LED) lighting fixtures through-
out the facility which supplies all of its general office lightings needs.
Task lighting at work stations was included, which helped in reduce the
lighting demand. Occupancy sensors that turn off and on lighting auto-
matically is part of the design and will help reduce HVAC and lighting
energy demands.
Not only was the mechanical and electrical systems designed to reduce
energy, but the envelope was designed to create a facility that would
require less energy consumption. This was done by using thicker exterior
insulation and low-e, double-glazed windows to help reduce heat gain in
the summer and heat loss in the winter months. Green roofs were utilized
on some roofs to help reduce radiant heat and the heat island effect.
The final strategy in reducing not only energy use, but its carbon foot-
print, was achieved by purchasing 54 million kilowatt hours of renewable
energy. This reduced the fossil fuel consumption by 40 percent for the
next four years—for a reduction of 60.5 million pounds of C02emissions.
• Building space type:
Office
• Tota square footage:
1,653,586 sq/ft
• Energy Use Intensity (EUI):
98 kBtu/sf/yr
• Percent C02 reduction:
46%
• ENERGY STAR design rating:
93
ANNUAL SAVINGS STATISTICS
(COMPARED TO AN AVERAGE BUILDING EPA RATING OF 50)
• Energy savings:
138,482,395 kBtu/yr
• C02 savings: 18,037 Metric Tons C02/yr
HKS

DESIGNED
TO EARN THE
ENERGY STAR
The as imated energy
performance fort isde ign meets
US EPA c ite i . The b il ing will
be eli ible for ENERGY STAR after
m int i ingsupe ior performance
for one yea .

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