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The Greening of IT
126 How Companies Can Make a Difference for the Environment

■ Cooling Load Factor (CLF) is the total power consumed by chillers, cool-
ing towers, computer room air conditioners (CRACs), pumps, and so on
divided by the IT Load.
■ Power Load Factor (PLF) is the total power dissipated by switch gear,
uninterruptible power supplies (UPSs), power distribution units (PDUs),
and so on divided by the IT Load.

These metrics will be designed to address the blurring of the lines
between the IT equipment and facility infrastructure as previously discussed.

Component Efficiency Standards
The Green Grid will also work with the industry to define energy-
efficiency guidelines for all the components in the data center. Such compo-
nents include the following:

■ Uninterruptible power supplies (UPSs)
■ Switch gear
■ Chillers ptg
■ Computer room air conditioners
■ Direct expansion (DX) units
■ Pumps
■ Cooling tower
■ Generators
■ Distribution losses external to the racks
■ Power distribution units (PDUs)
■ Batteries
■ Lighting
■ Servers
■ Storage

The effort to standardize metrics requires close collaboration with other
industry bodies such as the American Society for Heating, Refrigeration, and
Air Conditioning Engineers (ASHRAE).