Issue 16, June/July
FOCUS ASHRAE
of hours in each bin for Chicago multiplied by the average X-Factor for that bin can provide the composite Net X-Factor for the year.
In the Chicago example, the composite Net X-Factor for a typical year of climate data in Chicago is 0.99. In other words, there is virtually no difference to the Relative Hardware Failure Rate between operating at a continuous 20°C with strict control versus operating at a varying temperature in a fulltime economizer mode.
The example in
Table 7 for Chicago demonstrates the potential for
really significant savings
ABOUT THE AUTHOR Don Beaty
(chiller-less/ compressor-less etc) – even in a location such
as Chicago – without an increase in failures.
It is important to note that the values in Table C-1 are very valuable and can create significant opportunities but this information must be carefully modeled and applied. Commitment to particular system architecture should be deferred until the modeling has successfully been run and understood.
CONCLUSION
The ASHRAE TC 9.9 whitepaper titled 2011 Thermal Guidelines
for Data
Processing Environments – Expanded Data Center Classes and Usage Guidelines is a
YOU CAN FIND OUT MORE ABOUT ASHRAE AT
WWW.ASHRAE.ORG
You an downlonad the whitepaper in full from ASHRAE at
www.tc99.ashraetcs.org
started DLB Associates
Consulting Engineers in 1980. The firm is active globally and has provided services for mission critical facilities in over 35 states and throughout the world. DLB has designed all Google owned data center campuses worldwide.
Don is an ASHRAE Fellow. He has served in leadership positions on ASHRAE committees on energy and CRAC unit performance and was the first chair of ASHRAE Technical Committee TC 9.9. He currently serves as its Publications Chair.
Or from DatacenterDynamics at www.
datacenterdynamics.com/focus/white-papers
ASHRAE recommends reading the entire whitepaper for a full understanding of its new temperature guidelines, including all footnotes.
groundbreaking piece of work that potentially can radical improve both capex and opex. It creates environmental classes that enable fulltime economizers.
The whitepaper also provides critical information about the temperature impact on server power, server air flow, and failure rate.
AXi in a category by itself
• First Category 6A UTP solution to guarantee 4 dB of alien crosstalk margin • Best-in-class 100 Ohm balanced twisted pair system • Smallest and lightest CAT 6A cable on the market • Highest return on investment
NextLAN AXi Category 6A System See a video demonstration of AXi at
NextLANsystems.com/AXi
©2011 Leviton Manufacturing Co., Inc, and Superior Essex Inc. All Rights Reserved.
www.datacenterdynamics.com
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