Engineered Systems - June 2008 - (Page 50)

Notre Dame Tackles The Heat don’t do a very good job handling load diversification, he added. In addition, Notre Dame alumni offered to donate all of the air source rooftop units necessary to get this project completed, so the design team was able to focus on finding the right design for the project, Quigley said. Two recent installations at the stadium pointed toward an answer. LOCAL CONTRACTORS TO THE RESCUE The way the university’s prior “challenge projects” were handled ultimately solved the press box problem, Polotto said, thanks to the university’s local contractors who brought new techonology to the university’s attention. One such project was the renovation of the medical treatment rooms on the second level of the press box in 2003. EMS personnel are on-call 24/7 and monitor over 750 events on campus each year. Of the three treatment rooms, only one was air conditioned, leaving the other two to suffer high temperatures and poor IAQ. Additionally, the broadcast booth command post where EMS personnel monitor games was uncomfortable due to the lack of A/C and carried with it the requirement that it must be as soundproof as possible for personnel to hear transmissions. Because of the stadium’s construction limitations, split-ductless systems were specified for the space. Ideal Consolidated, Inc. acted as lead HVAC contractor for the installation, installing three Mitsubishi Mr. Slim systems. According to the Tom Gottfried, regional manager for Mitsubishi Electric HVAC, who specified the equipment with Quigley, the units are suited for historic structures and require no ductwork. A similar situation presented itself during renovations of Cushing Hall, home to the School of Engineering. Heavy-duty cooling was needed because of the building’s large computer lab and several research labs filled with computers. “We first had to convince the Notre Dame engineering professors that a heat pump was the best solution to their problems before they would consider installing the system,” Quigley said, prior to specifying Mitsubishi’s CITY MULTI VRFZ R2 Series variable refrigerant flow (VRF) system for the installation. VRF systems are more complex versions of ductless multi-split systems, and are most widely used in air or water cooled heat pumps or condensing units with heat recovery. As the system name suggests, the outdoor unit must have the capability to deliver a variable flow of refrigerant depending on the demand of the indoor units. Multiple indoor units can be connected to a single outdoor unit, making the systems suitable for use with large, multi-zone commercial spaces. (Goetzler, 2007) When in the cooling mode, refrigerant flows to the indoor units, Input 49 at www.esmagazine.com/instantproductinfo Matches AC System Output to Changing Loads, Maintains Comfortable Humidity Levels Most AC systems lack subtlety: they either run at full capacity or they’re off. Under low load conditions, most systems quickly cool the air and then shut down, allowing humidity to build. The APR Control lets AC systems operate at less than full capacity so they continue to dehumidify without overcooling. ■ News From The Underground There are more than seven miles of tunnels underneath the Notre Dame campus housing various distribution systems. The main tunnel system includes steam, condensate, compressed air, domestic hot water, fire alarm system, and telecom and IT systems. The various distribution systems include: • Ricwel system, which is a direct buried steam and condensate piping system —8,000 ft; • Chilled water distribution — 62,000 ft; • Domestic water distribution — 130,000 ft; • Electrical distribution — 148,000 ft; • Storm sewers — 121,000 ft; • Sanitary sewers — 87,000 ft. For retrofits or new DX systems to 100 tons ■ Ideal for makeup air and VAV systems ■ Fast, simple installation RAWAL DEVICES, INC TEL : 800 727 6447 FAX: 781 933 3306 sales @ rawal.com www.rawal.com Input 135 at www.esmagazine.com/instantproductinfo 50 En gi neer ed S y stem s June 2008 http://www.esmagazine.com/instantproductinfo http://www.rawal.com http://www.rawal.com 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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