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Figure 14 – Control technology to prevent Figure 15 – Control technology to minimize
decreased CPU performance overall energy consumption
6
Source Fujitsu (2012) Fujitsu develops power saving system control technology for container data centers
When the external temperature is between 10°C and 35°C, the container's air conditioning fan takes
air through the external intake vent and moves it inside the racks. The warm air from inside the
racks is then released from the exhaust vent.
When the external temperature exceeds 35°C, an evaporative cooling system cools the air to 35°C
or lower before moving it with the fan. This ensures that the temperature of the moving air into the
racks does not exceed the favorite range of temperature for servers.
Conversely, when the outside temperature is below 10°C, warm air being released from the racks is
passed through a damper and returned to the air intake vent side where it is warmed to 10°C or
higher before being moved into the racks by the fan. This prevents dew condensation.

Figure 16 – Prototype container data center Figure 17 – Container data center
contents

Figure 16 is a photo of a prototype container data center and Figure 17 is a schematic of the
container's contents.

The effect of reduction of electricity consumption with the prototype container data center was as
depicted in Figure 18. It shows that energy consumption is reduced by approximately 40% compared
with conventional container data center using internal fans equipped to servers.

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6 http://www.fujitsu.com/global/news/pr/archives/month/2012/20120404‐02.html

ITU‐T's Technical Reports and Specifications 233