certification shall be based upon computer simulations
of the overall building's annual energy consumption.
Computer programs must be approved by the Project
Manager, represented by the designer as being capable of
simulating weather variations, envelope heat transmission,
internal load fluctuations, ventilation and air infiltration
impacts, HVAC equipment part-load efficiencies, and
Legislation directs the Federal Government to adhere to
considered control strategies.
voluntary Commercial Energy Standards, reflected within
the Code of Federal Regulations, 10-CFR 434. ASHRAE
For Major Renovation/Alterations projects, that do not
Standard 90.1 meets or exceeds 10-CFR 434, and may be
substituted as a reference (with exceptions in lighting
performance shall be certified to achieve at least a 10
system performance as addressed in Chapter 6).
percent better peak load energy efficiency, compared to
ASHRAE 90.1. Involved equipment efficiencies shall also
Executive Order 13123 establishes a national program
be within the top 25% of manufactured product lines.
goal to reduce building annual energy consumption by 35
Certification shall include side-by-side performance
percent, using a 1985 baseline. To achieve this goal, GSA's
comparisons of each involved system/feature.
inventory must reach a metered (boundary) annual
energy consumption of approximately 55,000 BTU/GSF.
GSA's sustainability objective for LEED certification will
Photovoltaic Solar Cell Panels
likely be associated with trying to beat ASHRAE 90.1
energy performance by defined percentage levels, (e.g. 2
points toward certification for new construction projects
with every 20% increment, and for alterations projects
with every 10% increment).
GSA also fully supports the Government's Energy Star
Buildings Program for its existing inventory, achieving
metered consumption within the top 25% of involved
Energy Goal Applications
designs shall achieve the project's individually assigned
annual energy goal, established by the Office of the Chief
Architect. Generally , this goal will be below the 55,000
BTU/GSF-YR target of the above referenced Executive
Energy Conservation Standards
Revised March 2005 PBS-P100