DOE Establishes ANSI/ASHRAE/IESNA 90.1-2004 as Standard for Saving Energy in Buildings

January 21, 2009 // Published as a news service by IHS

American National Standards Institute (ANSI)/ASHRAE/IESNA Standard 90.1-2004 - Energy Standard for Buildings Except Low-Rise Residential Buildings has been established by the DOE as the commercial building reference standard for state building energy codes under the federal Energy Policy Act.

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The act requires all states to certify that they have state energy codes in place that are at least as stringent as 90.1-2004, or justify why they cannot comply. The DOE determined that Standard 90.1-2004 saves more energy than Standard 90.1- 1999, which was the previously referenced standard in the act.

"The 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% of commercial building energy consumption. Site energy savings are estimated to be approximately 11.9%," according to the ruling published in the Federal Register on Dec. 30, 2008.

The DOE said the newer version of the standard contained 13 positive impacts on energy efficiency. These impacts included changes made through the public review process in which users of the standard comment and offer guidance on proposed requirements to the standard.

These impacts include:

• Removal of explicit allowance for supply air into nonoccupied isolation areas.
• Limitations of the use of dampers in closed-circuit cooling towers in place of water bypass valves and piping.
• Additions of insulation requirements for buried ductwork.
• Mapping of envelope requirements to new climate zones, which led to increased stringency of envelope requirements.
• Mapping of economizer requirements to new climate zones, which led to geographic expansion of economizer requirements.
• Addition of requirements for ventilation fan controls.
• Lowered size range for part-load fan power limitation.
• Addition of requirements for heat pump pool heaters.
• Complete replacement of interior lighting power density allowances.
• Revised exterior lighting power density allowances.
• Addition of occupancy sensor requirements for classrooms, meeting rooms and lunch rooms.
• Lower retail sales lighting power allowance.
• New exit sign wattage requirement.

"ASHRAE is committed to continually improving building energy performance, so we are pleased with this recognition that the 2004 standard saves more energy," ASHRAE President Bill Harrison said.

"ASHRAE is currently working on the 2010 version of Standard 90.1 with a goal of achieving 30% energy savings compared to 90.1-2004 as part of our target to achieve market-viable net-zero-energy buildings by 2015."

In addition, ASHRAE said it is working on providing more stringent energy guidance in a proposed standard for high-performance buildings. Being developed in partnership with IESNA and the U.S. Green Building Council, Standard 189.1 - Standard for the Design of High-Performance Green Buildings Except Low-Rise Residential Buildings will provide minimum requirements for the design of high-performance new commercial buildings and major renovation projects, addressing energy efficiency, a building's impact on the atmosphere, sustainable sites, water use efficiency, materials and resources and indoor environmental quality.

Source: American Society of Heating, Refrigerating and Air-Conditioning Engineers Inc. (ASHRAE).