ASHRAE proposes changes to Standard 90.1

US agency seeks to provide energy-efficent improvements to standard

Yousef Alshaer is president of ASHRAE's Falcon chapter in the Middle East.
Yousef Alshaer is president of ASHRAE's Falcon chapter in the Middle East.

The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), represented in the UAE through its Falcon Chapter presided over by Yousef Alshaer, is proposing energy-efficiency improvements to an important building standard.

ANSI/ASHRAE/IESNA Standard 90.1-2007, Energy Standard for Buildings Except Low-Rise Residential Buildings, provides minimum requirements for the energy-efficient design of buildings except low-rise residential buildings. Currently 18 proposed addenda to the standard are open for public review.

“As we move toward publication of the 2010 standard, the 90.1 committee is considering many changes to reduce building energy use and cost,” said chairman Mick Schwedler. “The proposed addenda that are out for review move toward our goal of 30% energy cost-savings.”


Among the proposed addenda out for public review is Addendum BH, which would require supply-air temperature to be reset in multiple-zone HVAC systems. Balancing the reset with an increase in fan energy can substantially reduce system energy use, argued Schwedler.

“A preliminary energy analysis indicates that the whole building energy savings for buildings affected by this requirement is between 2.5% and 3%,” he added.

Proposed Addendum BF provides new requirements for continuous air barriers. Schwedler noted that, while performance requirements have existed for fenestration and door products, evidence suggests that the opaque envelope is the source of the majority of air leakage in buildings.

“A working group comprised of many interested parties developed an energy-saving proposal that we hope will lead to acceptance and adoption,” noted Schwedler.

Other proposals include Addendum F, which would allow a number of paths to reduce building roof load; Addendum BQ, which reduces additional lighting power allowances by reducing both lighting energy and the energy needed to cool the space; and Addendum BN, which requires orientation of fenestration to be considered to reduce thermal loads.

The proposed addenda to ASHRAE/IESNA Standard 90.1 are available during their public review period. To read the addenda or to comment, visit

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