Data Center Journal

Volume 28 | August 2013

Issue link: https://cp.revolio.com/i/148754

Contents of this Issue

Navigation

Page 29 of 36

modeling of data centers is most often intended to review performance under worst case conditions. The Case Study discussed within this report is considered new construction and therefore no data is available to calibrate the model. The model was instead built as accurately as possible based on input from the design engineers and server data provided by the manufacturer. CONCLUSIONS "Simplified Energy Modeling" of data centers avoids the need for a whole building energy analysis while maintaining accuracy. Since the spreadsheet model is built manually by the analyst, the calculations are very visible and easily modified. This translates to less time required for energy modeling that can be applied to the CFD analysis. When SaaS-based (software as a service) CFD software packages are chosen, these two modeling efforts can be "coupled" in a cost effective manner. The more robust and overreaching CFD packages are not necessarily required here. Typical costs for this combined modeling effort can range from $5,000 - $15,000 for up to 20,000 SF of white space and $15,000 - $20,000 for larger and more complex facilities. The number of ECMs analyzed and CFD iterations run will impact cost, but the total is not likely to exceed $20,000. Often times running a CFD model of a portion of a large white space is sufficient since it is a typical arrangement throughout. This type of modeling should be conducted early in design and updated throughout. Costs for model updates should be considerably less than the initial effort. Ideally, these models would again be updated / 13F DCJ_8375w525_2fx.q8_DCJ Half pagecomplete and 4:45facility has been comvalidated once construction is ad 7/23/13 the PM Page 1 missioned. It may also be of interest for the data center operators to obtain their own license to the CFD software. The analyst could then submit the models at the completion of the effort, allowing the operator to update the model as needed. These modeling efforts may also be performed prior to design, I.E. an existing facility energy audit. This is often done to obtain utility incentives / rebates for selected ECMs in an existing data center. Costs for these studies are similar to those described above. 'Marriage' of spreadsheet based energy analysis and low-cost CFD modeling allows us to accurately predict energy savings for various ECMs and verify / validate safe operating conditions. The methodology described within this report will increase the level of confidence for clients and provide a more comprehensive analysis of annual data center operations at a reasonable cost. n References Herrlin, Magnus K. PhD. Airflow and Cooling Performance of Data Centers: Two Performance Metrics. American Society of Heating, Refrigeration and Air Conditioning Engineers, Inc. (ASHRAE). Published in ASHRAE Transactions, Vol. 114, Part 2. 2008. RCI and RTI is a Trademark of ANCIS Incorporated. http://www.ancis. us/images/SL-08-018_Final.pdf National Solar Radiation Data Base – 1991 – 2010 Update. National Renewable Energy Laboratory (NREL). Renewable Resource Data Center (RREDC). http://rredc. nrel.gov/solar/old_data/nsrdb/1991-2010/. National Solar Radiation Data Base – 1991 – 2005 Update: Typical Meteorological Year 3. National Renewable Energy Laboratory (NREL). Renewable Resource Data Center (RREDC). http://rredc.nrel.gov/solar/old_data/nsrdb/1991-2005/tmy3/. VanGeet, Otto. FEMP Best Practices Guide for Energy-Efficient Data Center Design. Federal Energy Management Program (FEMP). National Renewable Energy Laboratory (NREL). Revised March 4, 2011. END-TO-END RELIABILITY: MISSION CRITICAL FACILITIES TURNING VISION INTOFALL CONFERENCE ACTION 2013 CONFERENCE KEYNOTE What it Takes to Stay Competitive: Sparking Innovation for Business and Economic Growth Carly Fiorina Former Chairman & CEO of Hewlett-Packard SAVE THE DATE November 17-20, 2013 www.datacenterjournal.com JW Marriott San Antonio Hill Country, San Antonio, TX THE DATA CENTER JOURNAL | 27 www.7x24exchange.org

Articles in this issue

Links on this page

Archives of this issue

view archives of Data Center Journal - Volume 28 | August 2013