Posted By Rich Miller On October 25, 2007 @ 4:05 pm In Power | Comments Disabled
In a white paper issued this week, The Green Grid  has entered the debate about the merits of DC power for improving the efficiency of power distribution within data centers. The group has evaluated seven power distribution configurations – four using AC power, and three using DC power.
The conclusion? The Green Grid predicts that international AC power standards can improve on the current U.S. standard of 480V and will gain traction in the short-term, but says the greatest long-term gains can be found in a currently unused 380 volt DC configuration. The carefully crafted paper highlights the benefits and drawbacks of AC and DC power without fully endorsing either approach, which is not entirely surprising for a 102 member consortium on an issue that generates lively debate among data center managers.
The Green Grid white paper, titled “Qualitative Analysis of Power Distribution Configurations for Data Centers,”  begins by noting that the U.S. standard of 480V and Canadian standard of 600V will experience only incremental efficiency improvements. It then examines five alternate configurations: 277V AC, 400V AC, 48V DC, 550V DC and 380V DC.
Here’s a brief summary of the evaluations of each configuration. The Green Grid emphasizes that these are qualitative analyses:
The Green Grid white paper won’t likely to settle the AC vs. DC debate, which has raged since the War of the Currents  in the late 1880s in which Thomas Edison (who favored DC) contested with AC advocates George Westinghouse and Nicolas Tesla. But it provides an informed overview of the leading options. The group noted that “efficiencies of the various configurations are within 5-10 percent of each other.”
Article printed from Data Center Knowledge: http://www.datacenterknowledge.com
URL to article: http://www.datacenterknowledge.com/archives/2007/10/25/green-grid-enters-ac-vs-dc-power-debate/
URLs in this post:
 Green Grid: http://www.thegreengrid.org
 “Qualitative Analysis of Power Distribution Configurations for Data Centers,”: http://www.thegreengrid.org/gg_content/TGG_Qualitative_Analysis_of_Power_Distribution_Configs_for_Data_Centers_WP4_FINAL.pdf
 War of the Currents: http://en.wikipedia.org/wiki/War_of_Currents
 Rich Miller: http://www.datacenterknowledge.com/archives/author/richm/
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