In May 2011, the American Society of Heating, Refrigeration, and Air conditioning Engineers (ASHRAE) published updated guidelines for the “Recommended” and “Allowable” temperature and humidity of data centers. The new specification created two new classifications of data centers and expanded the range of Allowable environmental conditions in order to encourage energy efficiency practices like air-side economization. The Green Grid published Free Cooling maps in 2009 based on the ASHRAE 2008 Recommended ranges for temperature and humidity. Now, with the wider Allowable ranges, new maps showing the expanded potential for free cooling are needed to encourage design teams to incorporate these energy saving techniques.
Author(s): The Green Grid