Providing insights for today’s hvac system designerEngineers Newslettervolume 44 –2Airside Economizers and ASHRAE Standard 90.1-2013Previous ENs discussed the benefit andoperation of an airside economizer-adevice used to conserve mechanicalcooling energy and reduce operatingcosts.This EN reviews the economizerrequirements of ASHRAE Standard90.1-2013, Energy Standard forBuildings Except Low-Rise ResidentialBuildings, the newest version of thepopular energy standard, with a focuson airside economizers.Figure 1 shows a map of the United Stateswith climate zones requiring economizersin gray and the climate zone not requiringeconomizers in red (1A).There are a number of exceptions to theeconomizer requirement (see sidebar p.
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