Customer Profile Campus Chill Water System Design and Operation Improved Through Hydraulic Modeling With AFT FathomTM Company: TME Energy Services Division To answer these questions a model of the district TME, Inc. cooling system was developed within AFT Fathom. In Address: 5800 Evergreen Drive, Suite A addition to the ability to model complex and large Little Rock, AR 72205-1757 networks (the model contains over 3,400 pipes and Telephone: 501-666-6776 junctions), unique capabilities provided by AFT Fathom Fax: 501-663-8888 were critical to the success of the study. TME, Inc. is a full service mechanical, electrical and Air conditioning load calculations were developed for energy engineering firm located in Little Rock, with average and peak demand periods during winter and branch offices in Tulsa and Tucson and provides services summer. Cooling load data was then converted into flow to clients in over 25 states. TME Energy Services Division demands for the many heat exchangers in the system. provides a wide assortment of energy related services Modifying the input for 358 pumps and control valves including utility rate analysis, energy audits, wholesale over the many different load cases studied was greatly purchasing of natural gas and electricity, and facilitated by using AFT Fathom's ExcelTM data import commissioning. capability. As James Hess, TME Energy Engineer comments, Reducing energy costs is an "Now that we had a method for quickly increasingly important consideration for making changes to the models, the real fun plant owner/operators with an excellent Annual energy savings began." A series of runs were made with example being the energy intensive of 1.9 million KWHr and varying loads, operating configurations, district cooling system serving the $67,000 in pumping pump characteristics and piping changes. University of Arkansas at Fayetteville. power, and $1,200,000 in In the end, the hydraulic model and This campus wide system provides air annual chiller electrical results achieved by the study were viewed conditioning for 59 buildings along with very favorably by the University. Benefits refrigeration heat rejection for laboratories and gas energy savings. derived from the hydraulic modeling and laser systems cooling. include: Classified as a primary/secondary/tertiary pump • Instill confidence in the method as the baseline model system, the primary circuit circulates water within the accurately reflected key operating characteristics of chiller plants, the secondary system distributes cooling the actual system. water from the plants to the buildings and other users and • Confirm selection of the pumps for the Main Plant the tertiary system consists of pumps within the various retrofit. buildings. With a total connected load of 13,600 cooling • Evaluated piping changes in various buildings to tons, the system includes a Main Chiller Plant with a achieve significantly improved delta-T thereby pumping capacity of 15,000 gpm, a Southwest Chiller lowering required flow rates. Plant with 9,000 gpm capacity and a North Chiller Plant • Verify the energy savings benefit that would result with a capacity of 6,000 gpm. As is the case with many from the "Low Flow/High Delta T" project. growing universities, UAF was undergoing significant • Identify potential bottlenecks to target areas of changes that would greatly impact the district cooling improvement. system. • Determine that operation of the steam turbine driven In addition to campus load growth, it was desired to North Chiller plant as a 'booster' pump could be evaluate changes to reduce pumping energy costs that eliminated realizing substantial energy savings. would result from supplying colder chilled water to the • Provide the University insight into how to best campus buildings, converting the buildings to variable operate the plants from a pumping energy flow using variable speed pump drives and eliminating consumption standpoint. the 'decoupler' at each building allowing it to take • Annual energy savings of 1.9 million KWHr and advantage of available differential pressure in the $67,000 in pumping power, and $1,200,000 in annual secondary system. These changes were cumulatively chiller electrical and gas energy savings. referred to as the "Low Flow/High Delta-T" project. Finally, an operating strategy for the chiller plants to "Overall, we were quite pleased with what we were minimize pumping energy was developed. No mean feat able to accomplish using the AFT Fathom software in this given the complexity of this system. project.", stated Mr. Hess. Applied Flow Technology Corp. • P.O. Box 6358, 400 W. Hwy. 24, Suite 201, Woodland Park, CO 80866-6358 • www.aft.com Typical Building with circulating pump, heat exchanger and flow control valves. Main Chiller Plant University of Arkansas at Fayetteville Chilled Water System AFT Fathom Southwest Chiller Plant For more information on AFT Fathom, contact Applied Flow Technology at (800) 589-4943 or visit our website at www.aft.com.
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