June 11, 2012
Cuts annual air conditioning power consumption by 20%,
equivalent to roughly 350,000 kWh and 120 tons of CO2
Tokyo, June 11, 2012 - Fujitsu today announced
that it has implemented a fine-grained, real-time
temperature distribution visualization system within Tohoku
Electric Power Group's datacenter in collaboration with
Tohoku Electric Power Co., Inc. and Tohoku Information
Systems Co., Inc. ("TOiNX"). Using the results
obtained from the generated visualizations, the companies
have completed a trial to optimize the datacenter's
air-conditioning power consumption.
Temperature distribution visualization, which employs
optical fiber-based multipoint temperature sensing
technology developed by Fujitsu Laboratories, is the first
of its kind in the world to involve the large-scale
deployment of such technology at a datacenter. The ability
to visualize temperature distribution makes it possible to
greatly improve the efficiency of the datacenter's air
conditioning, thereby reducing annual power consumption by
an anticipated 20%, equivalent to 350,000 kWh, or 120 tons
of CO2 emissions.
Tohoku Electric Power has actively pursued energy
conservation as part of its business activities, and the
company has been working with TOiNX to help it balance
maintaining stable operations of its internal information
systems with energy saving.
ICT equipment is often densely arranged within a
datacenter, thereby leading to increased power consumption
and greater amounts of heat produced by the equipment. As a
result, it can be a major challenge to deal with is the
increasing amount of power required by cooling systems to
maintain stable operations.
To adequately cool ICT equipment installed at a datacenter,
an efficient supply of cool air is needed, as well as a
system for properly circulating hot air vented from the
equipment while ensuring that it does not mix with the cool
Although efforts have been taken in the past to implement
improvements based on temperature data collected from a
limited number of sensing points, confirming whether the
cooled environment has been fully optimized throughout the
entire datacenter has proved difficult.
By applying optical fiber-based multipoint temperature
sensing technology from Fujitsu Laboratories as a way to
visualize the temperature distribution within the
datacenter-which is operated by TOiNX, part of the Tohoku
Electric Power Group-Fujitsu completed a trial that
leveraged the results of these visualizations to optimize
the datacenter's air conditioning.
A single optical fiber line, acting as a temperature
sensor, was installed at the front and back of each server
rack, as well as on the ceiling and floor, thereby enabling
the temperature distribution in the datacenter to be
measured in high resolution (in 10-cm intervals) and in
real time (every 30 seconds). The results of these
measurements revealed the following:
Heat accumulated at some locations near the ceiling, and
portions of this warm air circulated around the server
racks' air intake openings, heating up the upper part
of the racks.
Warm air from adjacent server racks mixed with cool air,
raising the temperature of cooling air being supplied to
the air intake openings.
Based on these results, it was possible to observe changes
in temperature distribution in real time while taking
measures to optimize the air-conditioning system through
repeated trial and error.
February 2012 to March 2012
Server racks: front and back of roughly 120 server racks
Floor: double-layered floors beneath the server racks
Ceiling: roughly the entire server room (optical fiber
arrayed in parallel every 50 cm)
While the datacenter was in operation, a number of measures
were taken which did not involve changes to the facilities
or the repositioning of equipment.
Closed off parts of the ceiling intake port and floor
grill using vinyl sheeting to improve the circulation
paths of cool and warm air
Using rack airflow control plates, directed air vented
from racks upward and isolated it from cool air near the
Using output airflow control plates, optimized the output
direction of air conditioners
Using subfloor airflow control plates, modified and
improved the subfloor airflow near racks
Idled five air conditioners
It was projected that power consumed by the
datacenter's air conditioning would be reduced over one
year by an anticipated 20%, equivalent to roughly 350,000
kWh and 120 tons of CO2.
Going forward, Fujitsu plans to continue employing this
technology to optimize air conditioning utilization and
enable stable system operations, while at the same flexibly
adapting to different operating conditions.
The optical fiber-based multipoint temperature sensing
technology employed in this trial is available as a
commercial product from Fujitsu Network Solutions.
This product will also be demonstrated at Interop Tokyo
2012, to be held from June 13-15 at Makuhari Messe in
Fujitsu is the leading Japanese information and
communication technology (ICT) company offering a full
range of technology products, solutions and services. Over
170,000 Fujitsu people support customers in more than 100
countries. We use our experience and the power of ICT to
shape the future of society with our customers. Fujitsu
Limited (TSE:6702) reported consolidated revenues of 4.5
trillion yen (US$54 billion) for the fiscal year ended
March 31, 2012. For more information, please see http://www.fujitsu.com.
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owners. Information provided in this press release is
accurate at time of publication and is subject to change
without advance notice.