Energy Efficiency in Data Centers What matters most to the
computer designers at Google is not speed, but power - low power,
because data centers can consume as much electricity as a city Eric
Schmidt, CEO of Google Diljot Singh Grewal 1
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Some Facts Data centers consumed 235 billion KWH of energy 2
worldwide(2010). Datacenters consumed 1.3% of total electricity
consumption of the world(as on august 2011) In 2000 DC used 0.53%,
which almost doubled to 0.97% in 2005, by 2010 it rose only to 1.3%
A rack drawing 20 KWH at 10cents per KWH uses more than 17000$ in
electricity. 2
6-12% loss 115kV to 13.2kV Loss ~0.5% Loss in Wires ~1-3%
Chillers consume 30 50% of IT Load. CRAC units consume 10-30% of IT
Load 8
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Improving Infrastructure Increasing Temperature to 27 C from 20
C. Isolate hot exhaust air from intake Using High Efficiency UPS
and other gear Google Achieved a PUE of 1.1 by 9 Better air flow
and Exhaust handling. Temperature of Cold Aisle at 27 C Cooling
Tower uses Water evaporation Per server UPS that has Efficiency of
99.99% instead of facility wide UPS 11
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Googles PUE over the years 12
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Humidity Control Condensation on Cooling coils can reduce the
humidity Low (
