Environmental Design + Construction - December 2008 - (Page 34)

Lab Materials & Sources: HVAC / Mechanical Chilled water is generated by three 240-ton McQuay centrifugal chillers and circulated by a constant ﬂow primary / variable ﬂow secondary pumping system. Condenser water is cooled via three Baltimore Aircoil closed-circuit, indirect evaporative cooling towers. While most of the cooled tower water feeds directly into the chiller condensers, some is routed through the building to serve AHU coils and to absorb heat rejected from refrigerators and freezers. Six 2,000 MBtuh condensing boilers from HydroTherm generate heating hot water, which is then distributed via a variable ﬂow, primary only pumping system. Sixteen custom Governair AHUs have been strategically located within internal mechanical rooms — some spanning multiple floors — so as to avoid interrupting the green roof. These units, in conjunction with an array of variable and constant volume air delivery systems, provide ventilation and comfort conditioning to most of the spaces. Arup used its own thermal analysis software (ROOM) to determine exhibit area surface temperatures, which were then used as input to STAR-CD computational ﬂuid dynamics software. As the building design was reﬁned, Arup used EnergyPlus energy simulation software to evaluate thermal and airﬂow behavior of the exhibit hall at design conditions. The radiant ﬂoor is based on an Uponor system built up over a base concrete slab covered by an inch of rigid insulation. Support rails rest on 1 in. strips of insulation and hold 5/8 in. dia hePEX plus tubing. For more information on the mechanical systems, visit www.esmagazine.com. Paul Switenki, P.E., a mechanical engineer with Arup, authored “Looking Radiant In Green” in the August 2008 issue of Engineered Systems. LIVING POLISHED CONCRETE WAS SELECTED BY ARCHITECT RENZO PIANO AS A SUSTAINABLE FLOORING OPTION. PERFECT POLISH ASSEMBLED A 10-MAN POLISHING CREW SCHEDULED IN TWO SHIFTS, SEVEN DAYS A WEEK FOR EIGHT TO 10 WEEKS TO ENSURE THE ALMOST 200,000-SQUARE-FOOT PROJECT WAS COMPLETED ON TIME. PHOTO COURTESY OF PERFECT POLISH. Reader Service No. 177 www.EDCmag.com/webcard 34 ed+c D E C E MBE R 08 EDC11084Dunh.indd 1 10/20/08 3:21:47 PM http://www.esmagazine.com http://www.dunhameng.com http://www.dunhameng.com http://www.EDCmag.com/webcard

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Environmental Design + Construction - December 2008

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