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Using Flow Optimizers to Save Cooling Fan Power
Keywords: flow optimizer, series fans, efficiency
The green data center initiative has increased everyone's awareness of power consumption. Cooling fans, although small relative to CRAC units and other large components, typically consume 5 to 15% of server power. The number is even higher for series fan configurations, as performance has traditionally suffered due to the swirl between the fans. This talk will focus on the use of DTS flow optimizers to increase the efficiency of a series configuration beyond that of the underlying fans, thereby enhancing performance beyond the two fan theoretical limit. In most cases this will allow fan power to be reduced by ~20% while still achieving the required operating point. The latent thermal headroom may be used to accommodate future upgrades and increases in component density, without changing the fans. An introduction to flow optimizers will be followed by a review of performance and efficiency results from a variety of fan sizes, designs and manufacturers. Two brief case studies will highlight actual power savings and latent thermal headroom results for 1U and large format servers. Additional examples will include blower replacement and extreme static pressure configurations. Finally, a general design methodology for implementing flow optimizers will be provided.
Howard Harrison,
Distributed Thermal Systems (DTS) Ltd.
Oakville, Ontario L6H 5V1,

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