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in modern day equipment racks, the power consumed by the cooling fans represents a significant percentage of the overall system power budget. with the advent of data centers and their large energy costs, the issue of “cooling power” is exacerbated. it is, therefore, becoming crucial to design and implement methods for reducing data centers’ power consumption.
as an example, a large data center contains about 400,000 servers and consumes 250 mw of power [1]. it has been estimated that about 20 % of the total power supplied to a high end server is consumed by fans.
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