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218 P P a r t V : a r t V : T h e G r e e n i n g P r o c e s sh e G r e e n i n g P r o c e s s

Heat is
transferred
away from the
hardware to
equipment at
the bottom of
the server rack.
Heat The heat is then
transferred to a
fluid – like water
– which can be
used to help
heat the
building.

Water line to heating
system

FIGURE 11-3 The heat can be taken from servers and used to help heat the facility.

Design
When you design or redesign your datacenter with green in mind, approach it from the
perspective of rightsizing the physical infrastructure. Use efficient devices, and design with
energy efficiency in mind. The following sections will examine how you can make the most
efficient decisions and plans for your datacenter.

Efficiency
You can ensure better efficiency in your datacenter by looking at some common sources of
problems:

• Power distribution units operating well below their full load capacities
• Air conditioners forced to consume extra power to drive air at high pressures over
long distances