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THERMAL DESTRATIFICATION OF AIR STREAMS TO IMPROVE THE COOLING PROVISIONING OF AIR-COOLED DATA CENTERS
Keywords: THERMAL DESTRATIFICATION, AIR STREAMS, DATA CENTERS
According to ASHRAE, Air side economization is an arrangement of duct, damper and automatic control system which together allow introducing outside air to reduce the mechanical cooling during mild or cold weather thereby decrease the energy consumption. The outside ambient air and heated return air from the data center is mixed inside a dedicated space to achieve a target cold aisle operating temperature and thereby increase economization. The dedicated space where these two air streams mix is called a mixing chamber. Major constrain faced by the design engineers while designing the Mixing Chamber/ Plenum is the stratification of air stream due to the Temperature gradient in the mixed air stream and this stratification can be attributed to the short span of time and space that is available for the air streams to interact with each other. Thermal stratification can lead to coil freeze-ups, nuisance freeze-stat trips, energy wastage due to sensing error and poor indoor air quality. In this study mixing chamber configurations are considered upon surveying the commercially available modular cooling units with mixing chamber/plenum built into them. The outcome of this research will be identifying the operational scenarios and sites within the airflow path in a data center where thermal stratification can result in undesirable thermal gradients/layers.
A. Barigala Charles Paulraj,
University of Texas at Arlington
Arlington, TX
USA


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