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Changes Proposed to Standard 90.1
July 22, 2009

Proposed changes designed to improve the energy efficiency of buildings covered by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) / Illuminating Engineering Society of North America (IESNA) Standard 90.1 are open for public comment. The American National Standards Institute (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.

Among the proposed addendum out for public review is addendum bh, which would require supply air temperature reset in multiple-zone HVAC systems. Balancing the reset with an increase in fan energy can substantially reduce system energy use. Proposed addendum bf provides new requirements for continuous air barriers. 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. Other addenda include f, which would allow a number of paths to reduce building roof load; bq, which reduces additional lighting power allowances by reducing both lighting energy and the energy needed to cool the space; and 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 ASHRAE Public Reviews online.

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