1.7 Energy Conservation Standards
Legislation directs the federal government to adhere to voluntary Commercial Energy Standards, reflected within the Code of Federal Regulations, 10-CFR 434. ASHRAE Standard 90.1 meets or exceeds 10-CFR 434, and may be substituted as a reference (with exceptions in lighting system performance as addressed in Chapter 6).
Executive Order 13123 establishes a national program goal to reduce building annual energy consumption by 35 percent, using a 1985 baseline. To achieve this goal, GSA’s inventory must reach a metered (boundary) annual energy consumption of approximately 55,000 BTU/GSF.
GSA’s sustainability objective for LEED certification will 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 building categories.
Energy Goal Applications
For new construction and building modernizations, 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 Order.
For new construction and building modernizations, 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 considered control strategies.
For Major Renovation/Alterations projects, that do not involve total building modernization, involved system performance shall be certified to achieve at least a 10 percent better peak load energy efficiency, compared to ASHRAE 90.1-1999. Involved equipment efficiencies shall also be within the top 25% of manufactured product lines. Certification shall include side-by-side performance comparisons of each involved system/feature.