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Dennis P. Symanski
EPRI - Senior Project Manager
SVLG Data Center Efficiency Summit
24OCT2012 – AMD Sunnyvale, CA
Better Cooling With Slower CRAC Fans
2 © 2012 Electric Power Research Institute, Inc. All rights reserved.
Thanks To The California Energy Commission!!!
3 © 2012 Electric Power Research Institute, Inc. All rights reserved.
EPRI & NetApp Data Center Features
EPRI
~12 Years Old
~1300 Sq Ft
~85 kW of IT Equipment
Air-cooled DX CRAC Units
Raised Floor
2 Compressors Per CRAC
2 Independent Refrigeration Circuits
Intertwined Cooling Coils
NetApp
~2 Years Old
~1000Sq Ft
~55 kW of IT Equipment
Water-cooled DX CRAC Units
Slab Floor
2 Compressors Per CRAC
2 Independent Refrigeration Circuits
Independent Cooling Coils
6 © 2012 Electric Power Research Institute, Inc. All rights reserved.
Installation Of Variable Speed Drives At EPRI
VSD
VSD By-Pass
10 HP Fan Motor
EPRI
CRAC B
(We Used The
Existing Fan
Motors Which
Were Not VSD
Rated)
7 © 2012 Electric Power Research Institute, Inc. All rights reserved.
Installation Of Variable Speed Drives At NetApp
VSD
Fan
Motor
(Again, We
Used The
Existing Fan
Motors)
8 © 2012 Electric Power Research Institute, Inc. All rights reserved.
Installation Of Power Metering At EPRI
Breaker Panel Feeding CRACs
(Raw Utility Power)
Breaker Panel Feeding PDUs
(Fed From UPS)
9 © 2012 Electric Power Research Institute, Inc. All rights reserved.
Existing Power Metering At NetApp
Already Part Of The Building Management System
10 © 2012 Electric Power Research Institute, Inc. All rights reserved.
EPRI Palo Alto Data Center Thermal Map
CRAC A
CRAC B
PDU A
PDU B
11 © 2012 Electric Power Research Institute, Inc. All rights reserved.
Air Curtains At NetApp
Cold Air Vent
Air
Curtains
Cold
Air
Containment
12 © 2012 Electric Power Research Institute, Inc. All rights reserved.
Condensation Was Expected & Planned For
Proper positioning of drip shield Misplaced drip shield
Condensation dripped onto floor & set off moisture sensor alarm
Misplaced drip shield repositioned & problem solved
13 © 2012 Electric Power Research Institute, Inc. All rights reserved.
IT Load & CRAC Load At Various VSD Speeds
14 © 2012 Electric Power Research Institute, Inc. All rights reserved.
Cooling Energy Use Versus Indoor Fan Speed
19
.4%
26
.6%
30
.9%
15 © 2012 Electric Power Research Institute, Inc. All rights reserved.
Fans & Cooling Compressors Energy Savings
0%
5%
10%
15%
20%
25%
100% Manual
80% Manual
70% Minimum, Under Vigilent
Control
60% Minimum, Under Vigilent
Control
Tota
l Co
olin
g En
erg
y Sa
vin
gs, %
Total Cooling Energy Savings from Fans and Compressorsas Compared to 100% Fan Speed
Total Compressors Enery Use Reduction, kWh/kWh of the IT Energy Use
Total Fan Enery Use Reduction, kWh/kWh of the IT Energy Use
16 © 2012 Electric Power Research Institute, Inc. All rights reserved.
Unplanned Thermal Research
Planned But “Unannounced” Palo Alto Muni Power Outage – Saturday 14JUL 8:30AM
IT Equip on UPS – CRAC Units Not On UPS & Did Not Restart
Data Center Temp Went From 68ºF To 112ºF In 2 Hours
Some IT Equipment Shut Down – No IT Equipment Failures
17 © 2012 Electric Power Research Institute, Inc. All rights reserved.
Are We Finished With Data Center Energy Efficiency?
Now this is not the end.
It is not even the beginning of the end.
But it is, perhaps, the end of the beginning.
18 © 2012 Electric Power Research Institute, Inc. All rights reserved.
New York Times & U.S. Congress & WNYC/NPR
23SEP2012 Sunday New York Times
http://www.nytimes.com/2012/09/23/technology/data-centers-waste-vast-amounts-of-energy-belying-industry-image.html?pagewanted=all&_r=0
27SEP2012 U.S. Congress letter to the Dept of Energy & the EPA
http://democrats.energycommerce.house.gov/sites/default/files/documents/Chu.Jackson.DataCenterEnergyEfficiency.2012.9.27.pdf
05OCT2012 Live Interview by Leonard Lopate on WNYC/NPR
http://www.wnyc.org/shows/lopate/2012/oct/05/please-explain-cloud-computing-and-data-barns/