Engineered Systems - April 2008 - (Page 23)

CaseInPoint THE RESULT StopWaste.org received a total project score of 54 (two points more than required for LEED Platinum certiﬁcation), and all 10 credits for optimizing energy performance. Software energy modeling shows that the building outperforms Title 24-2005, California’s stringent energy code, by 47%. “Occupants’ comfort, energy-efﬁciency and an affordable system — we wanted all three and were able to get them,” said Wendy Sommers, senior program manager at StopWaste.org. “Getting a LEED Platinum rating is icing on the cake.” “The application of high output UVC lights in mechanical systems is a practical technique that offers beneﬁts for many types of buildings, and we are very pleased that the USGBC now recognizes UVC under their LEED rating system.” The new 45,000-sq-ft building contains the Sammamish City Hall, police station, council chambers, and public lobby on the ﬁrst ﬂoor. A smaller second ﬂoor contains commercial space that will be initially leased while allowing for future growth of the city hall and police station. UVC technology grabs LEED® points at city hall project When the City of Sammamish (WA) asked the design team to provide a LEED® Silver certiﬁed building for the new city hall at the 25-acre Sammamish Commons redevelopment project, Notkin Mechanical Engineers believed IAQ was of paramount importance. A key aspect of improved IAQ is to reduce the risk of human exposure to microorganisms that can potentially occur in public buildings. At the same time, the project team wanted to ﬁnd ways of reducing HVAC energy and operational costs. The use of UVC Emitters™ manufactured by Steril-Aire, Inc., installed in the AHUs downstream of the cooling coils, enabled them to achieve both objectives as well as an ambitious third goal: of becoming the ﬁrst project to earn a LEED Innovation in Design point for the use of UVC germicidal lights in air handlers. BLAZING A TRAIL Being the ﬁrst is never easy, so when Notkin project engineer Darren Schwend, P.E., saw an opportunity to earn a LEED point for UVC, he compiled a detailed narrative on its proven IAQ, energy, and coil-cleaning beneﬁts. Working with Steril-Aire distributor Air Commodities, Inc., Schwend submitted published studies, articles, and other support documentation to the USGBC to make the case for UVC. “In fall of 2007, we learned that the project received an Innovation in Design point for UVC as well as the overall LEED Silver certiﬁcation that we sought,” said Schwend. John Rowland, P.E., Notkin partner, added, “The air quality in “The air quality in the building has b been excellent since the UVC ligh the UVC lights ghts became operational became operational about year ago about a year ago. We are very satisfied atisfied with the IAQ and opera o ope ational benefits, , and and we are excited to are excited to be the first project the first project to use this technology use this technology for LEED credit.” — Sevda Baran, project manager, Sammamish Commons Heating and cooling is provided by two packaged rooftop AHUs designed by Petra Engineering. Both are VAV units equipped with DX and hot water coils and are capable of 100% economizer cooling. AHU 1 (24,000 cfm) serves the ﬁrst-ﬂoor municipal facilities, and AHU 2 (9,500 cfm) serves the second-ﬂoor leased space. A DNA KILLING MACHINE The UVC devices selected for the application are Steril-Aire, high-output, singleended (SE Series) UVC Emitters, which are designed for easy installation in rooftop systems. UVC energy is the most germicidal wavelength in the ultraviolet spectrum. Properly installed in an air-handling system, UVC lamps emit enough of this energy to penetrate even the tiniest microbe to destroy its DNA and RNA, killing or deactiFREE INFO: 60 w w w. esmag a zin e. c o m 23 http://StopWaste.org http://www.ruskin.com http://StopWaste.org http://StopWaste.org http://www.ruskin.com http://www.ruskin.com http://www.esmagazine.com

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Engineered Systems - April 2008 Contents Editor’s Note Back2Basics HVAC Challenge Case In Point Commissioning Building Automation Energy Wiz HVACR Designer Tips This Time, Water Cooled Was All Wet Cleanroom Design In 10 Easy Steps It's Not The Heat, It's The Humidity Issues & Events Computers and Software Products Glossary Classifieds Advertiser Index Tomorrow’s Engineer

Engineered Systems - April 2008

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