Engineered Systems - June 2008 - (Page 54)

Notre Dame Tackles The Heat tems of South Bend was in charge of the insulation, and Ziolkowski Construction provided general trade support for the press box project. GAME TIME TEST The installation was completed in 2007, just in time for the annual spring football game with 200 members of the press in attendance. “When we started up the system around 8 a.m. on game day it was 83° in the press box. By 10 a.m. it was 67°. At game time it was 67° with a packed room. At the end of each quarter it was still 67°. All systems performed flawlessly,” said Bruce Heberle with Excelsior. For his part, Quigley is happy with the VRF system, which solved both of his installation problems. “The system allowed us to move refrigerant instead of air, which meant we could make the same precarious journey from roof to press room with eight small 1 7/8-in. copper lines instead of multiple 4-ft by 3-ft supply and return duct runs, solving the installation problem,” Quigley said. Inside the box, specific air handlers were placed in front of the glass to give the glass area a constant air wash, while air handlers installed in other areas of the room did not need to be load intensive. All of the air handlers incorporate linear expansion valves, which means they produce the precise amount of cooling that each area needs at all times. “This is a huge energy saver, since the glass load goes from extremely intense to rather mild depending upon the time of the day, and the location of the sun, and the units only work as much as is necessary to produce the amount of cooling needed to handle the load,” Quigley said. At times when the load is low, the inverter compressor, and air handlers cycle down as low as 16% of their rated capacity, meaning 84% less energy used. “This solved the comfort problem,” he added. As for the offer of donated equipment, which doesn’t happen every day, Quigley said that free equipment is pretty tough competition for a bid. However, due to the creative, practical, and functional solutions made possible by the VRF system, Notre Dame turned down the offer for the free air source rooftop units and opted to invest in this technology instead. “They knew they were money ahead for years to come, and the integrity of the building would not be affected by our installation,” he added. ES Commercial Replacement Coils Tel: 800-225-4328 Fax 662-229-4212 OEM Coils Tel: 662-229-2000 Fax 662-229-2297 Aluminum Coils Tel: 662-229-2587 Fax 662-229-2571 ● ● ● ● ● ● ● Quality Lead-time Reliability Factory Trained Representation Selection/Rating Software ARI & UL Certification UL Qualified Client Test Data Program Fritz is ES’ managing editor. Reach her at fritzc@bnpmedia.com. coils@luvata.com www.luvata.com/heatcraft Input 208 at www.esmagazine.com/instantproductinfo BIBLIOGRAPHY Amarnath, Ammi, and Morton Blatt, “Variable Refrigerant flow: Where, Why, and How,” Engineered Systems, February 2008, Vol. 25, No.2:54. Goetzler, William, “Variable Refrigerant Flow Systems,” AHSRAE Journal, April 2007:24. 54 En gi neer ed S y stem s June 2008 http://www.luvata.com/heatcraft http://www.luvata.com/heatcraft http://www.esmagazine.com/instantproductinfo

Table of Contents Feed for the Digital Edition of Engineered Systems - June 2008

Engineered Systems - June 2008 Contents Editor’s Note Letters To The Editor Back2Basics HVAC Challenge Case In Point Commissioning Efficiency Incentives HydroTech Building Automation Energy Wiz HVACR Designer Tips Notre Dame Tackles the Heat State Of The Arts Time For A Transplant? Project Delivery: What Can IPD Do For You? Issues & Events Computers & Software Products Application Checklist Glossary Classifieds Advertiser Index Tomorrow’s Engineer

Engineered Systems - June 2008

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