Better Cooling With Slower CRAC Fans
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1 Better Cooling With Slower CRAC Fans Dennis P. Symanski EPRI - Senior Project Manager SVLG Data Center Efficiency Summit 24OCT2012 AMD Sunnyvale, CA
2 Thanks To The California Energy Commission!!! 2
3 EPRI & NetApp Data Center Features EPRI NetApp ~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 ~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 3
4 EPRI Palo Alto Data Center 4
5 NetApp Sunnyvale Data Center 5
6 Installation Of Variable Speed Drives At EPRI VSD EPRI CRAC B VSD By-Pass 10 HP Fan Motor (We Used The Existing Fan Motors Which Were Not VSD Rated) 6
7 Installation Of Variable Speed Drives At NetApp VSD Fan Motor (Again, We Used The Existing Fan Motors) 7
8 Installation Of Power Metering At EPRI Breaker Panel Feeding CRACs (Raw Utility Power) Breaker Panel Feeding PDUs (Fed From UPS) 8
9 Existing Power Metering At NetApp Already Part Of The Building Management System 9
10 EPRI Palo Alto Data Center Thermal Map CRAC A PDU A CRAC B PDU B 10
11 Air Curtains At NetApp Cold Air Vent Air Cold Air Containment Curtains 11
12 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 12
13 IT Load & CRAC Load At Various VSD Speeds 13
14 19.4% 26.6% 30.9% Cooling Energy Use Versus Indoor Fan Speed 14
15 Total Cooling Energy Savings, % Fans & Cooling Compressors Energy Savings 25% Total Cooling Energy Savings from Fans and Compressors as Compared to 100% Fan Speed 20% 15% 10% 5% Total Compressors Enery Use Reduction, kwh/kwh of the IT Energy Use Total Fan Enery Use Reduction, kwh/kwh of the IT Energy Use 0% 100% Manual 80% Manual 70% Minimum, Under Vigilent Control 60% Minimum, Under Vigilent Control 15
16 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 16
17 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. 17
18 New York Times & U.S. Congress & WNYC/NPR 23SEP2012 Sunday New York Times 27SEP2012 U.S. Congress letter to the Dept of Energy & the EPA 05OCT2012 Live Interview by Leonard Lopate on WNYC/NPR 18
19 Together Shaping the Future of Electricity 19
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