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Appendix A
Green IT Checklist and Recommendations 223

✓ Liquid cooling for hot equipment with rear door heat exchanger or side
car technologies.
✓ Enough water cooling taps built into water system for new growth.
✓ Minimize impedance of piping (water or air) to reduce pumping power
required.
✓ Leak detection under raised floor for water distribution system.
✓ Variable frequency drives on all pumps and air-conditioning equipment.
✓ Do not build out all facilities at once. Be modular and strive for high uti-
lization of IT and facilities equipment.
✓ Easily displayed power and thermal monitoring for data center. Large dis-
plays to highlight success / energy saved. Take pride in using less.
✓ Where possible, measure overall data center Power Unit Efficiency and
plan on ways to keep reducing as new state-of-the-art equipment and
processes become available.
✓ Physical: Fire protection system FM—200 or wet sprinkler + security
system with “man trap” to keep potential intruders from entering the
ptg
raised floor.
✓ Liquid side economizer. Efficiently control humidity.
✓ Thermal storage to optimize use of chillers and reduce energy cost at
peak hours.
✓ High-efficiency pumps, chillers, and fans for cooling towers.
✓ If possible, use cooling towers in summer and reuse waste heat to reduce
energy in winter.
✓ When designing a new facility, place the infrastructure in the basement.
Position the water piping and electric cables in the ceiling of the base-
ment below the raised floor, leaving the first floor raised flow clear of
obstructions.
✓ Use virtualization for testing and potentially actual disaster recovery.
Where possible, architect and build active solutions (production in two
places that can nondisruptively add capacity to back up and scale when
needed).
✓ Virtualize servers, storage, and network.
✓ Link facilities and IT. Offer new types of service level agreements based
on performance / watt and not just performance.