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Chiller efficiency improvements proposed for Standard 90.1


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December 17, 2012

Chiller efficiencies for air and water cooled chillers would be boosted to more than 20 per cent under a proposed addendum to the ASHRAE/IES Standard 90.1-2010, Energy Standard for Buildings Except Low-Rise Residential Buildings. The addendum changes the requirements for air and water cooled chillers as defined in section 6.4.2.1 and the efficiency requirements listed in table 6.8.1C. Addendum ch is open for public review from Nov. 30, 2012,-Jan. 14, 2013. In 2010, a Path B was added to the standard for part load intensive water cooled chillers. Proposed addendum ch would expand Path B by adding requirements to include air cooled chillers. Also as part of this change, efforts were made to bring the efficiency requirements for water cooled positive displacement and centrifugal chillers together while considering the available technology, and to chillers to be applied at other application conditions where one technology may better suited than the other.  If approved, the new efficiency requirements would go into effect on Jan. 1, 2015. The proposed efficiency requirements in addendum ch increase annual energy savings to 23.1 per cent vs. Standard 90.1-2004 and 8.3 per cent vs. Standard 90.1-2010. In 2010, the overall weighted average savings resulted in a 16.2 per cent improvement in chiller annualized energy use vs. Standard 90.1-2004.


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