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7 May 09 1Environmental Energy Technologies Division
Data Center Control with
Wireless Sensor Technology and
Airflow Management
Demonstration at the California Franchise Tax Board
August 2008 - April 2009
7 May 09 2Environmental Energy Technologies Division
Opening Remarks: Welcome & thank you for attending… In August 2008, FTB partnered with California’s
Department of General Services and the California Energy Commission to install a Data Automation Software and Hardware (DASH™) system from Federspiel Controls.
The DASH system uses wireless sensors and web based software to control computer room air handling (CRAH) units.
The project also included installing variable frequency fan drives and fusible-link curtains.
7 May 09 3Environmental Energy Technologies Division
Opening Remarks: Thanks to our supporters!
7 May 09 4Environmental Energy Technologies Division
Project Overview: Significant Results…
Reduces fan energy by 66%
Lowers total energy by 21.3%
Saves 475,000 kWh/yr Eliminates >400 tons
CO2/yr Payback in 3.1 years Bottom-line: $42,722 per
year saved
7 May 09 5Environmental Energy Technologies Division
Demonstration Support: Primary Goals…Demonstrate wireless, mesh-network technology to
directly control air handlers.Analyze supervisory software and hardware.Eliminate over-cooling caused by contending controls.Examine air management best-practices.Ensure CRAH unit operational redundancy.
LBNL mission:Perform independent “white-paper” review of project.Provide knowledgeable support to all parties involved.Share project findings with data center community.Satisfy PIER and CEC resource needs…
7 May 09 6Environmental Energy Technologies Division
Executive Summary:FTB Data Center
Description:• 10,000 Sq Ft • 12 CRAH cooling units • 135 kW load
Challenges:• Over-provisioned • History of fighting • Manual shutoff not successful
Solution:• Intelligent supervisory control software with inlet air sensing
7 May 09 7Environmental Energy Technologies Division
Project Tasks:
• Establish baseline
• Adjust floor tiles
• Install Variable Frequency Drives (VFDs)
• Install supervisory control software
• Isolate hot-aisles
• Blank racks
7 May 09 8Environmental Energy Technologies Division
DASH: • 50 wireless temperature sensors
(Dust Networks radios)• Intelligent control software
7 May 09 9Environmental Energy Technologies Division
89 °F (31.7 °C)
63 °F (17 °C)
Airflow Solution
7 May 09 10Environmental Energy Technologies Division
Smart software: learns about curtains
CRAH 3 influence at start CRAH 3 influence after curtains
CRAH-03
7 May 09 11Environmental Energy Technologies Division
Effect on cold aisle temperatures:
50
55
60
65
70
75
80
85
90
A B C D E FTime Interval
degF
floor
tile
cha
nges
VFD
s
cont
rol s
oftw
are
hot a
isle
isol
atio
n
rack
bla
nks
lower limit of ASHRAE recommended range
upper limit of ASHRAE recommended range
7 May 09 12Environmental Energy Technologies Division
DASH = Dramatic Reduction…
0
10
20
30
40
50
60
1/31 2/5 2/10 2/15date/time
Mai
n br
eake
r, kW
BEFORE
AFTER
DASH™ software started
7 May 09 13Environmental Energy Technologies Division
CRAH Power reduction:
0
10
20
30
40
50
60
A B C D E FTime Interval
mai
n br
eake
r kW flo
or ti
le c
hang
es
VFD
s
cont
rol s
oftw
are
hot a
isle
isol
atio
n
rack
bla
nks
7 May 09 14Environmental Energy Technologies Division
Cost-Benefit analysis:
• Total project cost-benefit• Cost: $134,057• Savings: $42,772• Payback: 3.1 years
• DASH cost-benefit (sensors and software)• Cost: $56,824• Savings: $30,564• Payback: 1.9 years
7 May 09 15Environmental Energy Technologies Division
Lessons learned:
• Controls and software eliminated 59.6% of fan energy and 13.6% of chilled-water use from baseline.
• Re-arranging floor tiles reduced chilled water use and made cold-aisle temperatures more uniform.
• VFDs reduced CRAH electrical energy use and further reduced chilled water use.
• Isolation enabled higher return air temperatures, increasing CRAH capacity.
• Wireless reliability was 99.999% (only 81 packets lost out of nearly 10 million sent).
7 May 09 16Environmental Energy Technologies Division
Closing Remarks:Suggested next steps… Continue optimization of control and sensor
installations.
Scrutinize floor tile re-arrangement benefits.
Evaluate higher chilled-water temperature to save energy.
Consider introducing outside air to cool data centers.
Turn Off Lights in your data center!
7 May 09 17Environmental Energy Technologies Division
Real improvements; No waiting; Let’s do it!
Readily available…
Applicable throughout California…
Short payback periods; 3 to 5 years...
Creates jobs…
Saves energy and the environment…
7 May 09 18Environmental Energy Technologies Division
Questions?
7 May 09 19Environmental Energy Technologies Division
For More Information
Bill Tschudi, [email protected]
http://hightech.lbl.gov/datacenters.html
Geoffrey C. Bell, [email protected]
Cliff Federspiel, Ph.D., [email protected]
