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The electric power consumed to manage our digital dependency is growing, and so is the resulting by-product: heat. This article explores a cooling/heat rejection strategy that is gaining acceptance and achieves a balance of reliability and energy efficiency, the indirect air-side economizer (IASE) system. The IASE uses an air-to-air heat exchanger (HX) to transfer data center heat to a separate outdoor airstream (“scavenger air”).

Citation: ASHRAE Journal, vol. 53, no. 3, March 2011