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American National Standard Results in Greater Energy Efficiency, Says DoE

New York, Jan 12, 2009

Correction notice:

This article has been modified in accordance with the Federal Register notice on January 14, 2009.

In a Federal Register notice dated December 30, 2008, the U.S. Department of Energy (DoE) has determined that the provisions of ANSI/ASHRAE/IESNA 90.1-2004, Energy Standard for Buildings except Low-Rise Residential Buildings, would achieve greater energy efficiency in buildings subject to the code than the 1999 edition of the standard.

According to DoE, “[t]he quantitative analysis of the energy consumption of buildings built to Standard 90.1-2004, as compared with buildings built to Standard 90.1-1999, indicates national source energy savings of approximately 13.9 percent of commercial building energy consumption. Site energy savings are estimated to be approximately 11.9 percent.”

As laid out in Title III of the Energy Conservation and Production Act, whenever ANSI/ASHRAE/IESNA Standard 90.1-1989, or any successor to that code, is revised, the DoE Secretary must determine whether the revised code would improve energy efficiency in commercial buildings.

Now that the Secretary has issued the determination, each State has up to two years to review the provisions of its commercial building code regarding energy efficiency, and certify that its code meets or exceeds ANSI/ASHRAE/IESNA 90.1-2004.

In arriving at a determination, the Department first reviewed all significant changes between the 1999 edition and the 2004 edition of Standard 90.1, including those changes made between the 1999 edition and the 2001 edition (ANSI/ASHRAE/IESNA Standard 90.1-2001). According to the DoE analysis, the 2004 edition achieves greater energy savings in thirteen distinct areas, including additional insulation requirements for buried ductwork, lower retail sales lighting power allowance, new requirements for exit sign wattage, and others.

ANSI/ASHRAE/IESNA 90.1-2004 is an American National Standard developed jointly by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) and the Illuminating Engineering Society of North America (IESNA). This standard provides minimum energy-efficient requirements for the design and construction of new buildings and their systems, new portions of buildings and their systems, and new systems and equipment in existing buildings. The document also details criteria for determining compliance with these requirements.

Both ASHRAE and IESNA are members and accredited standards developers of the American National Standards Institute (ANSI).

For more information, see the Federal Register notice.

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