High Performing Buildings - Spring 2009 - (Page 17) airflow, especially at the “cold” window wall where downdrafts occur. Custom-made TDV diffusers were designed for the commons area. The diffusers served as a base for tables and allowed integration into the architecture. The 20 miles of radiant floor tubing was the largest such installation in the area. Additionally, no thermal insulation was provided between the floor slabs and the active radiant slab to control installation costs, again a first for this region. Also,140°F to 100°F high delta T low temperature heating water distribution and design had not been used in our region. The TDV reduced duct space in the rooms, thus allowing higher ceilings for the given wall height, which allowed higher window head elevations thereby improving daylight pen- etration and improving the effectiveness of the indirect lighting systems. operation & Maintenance Full BMS systems included off-site monitoring. Smaller distributed air handling equipment allows portions of the building to be shut down if not required for instruction. Stacked airhandling units/exhaust units provide a compact system, increasing usable space. High quality air filtration keeps coils and ductwork cleaner. to some higher priced equipment and systems, the integration of the architectural, mechanical and electrical systems allowed for what Rocky Mountain Institute calls “tunneling through the cost barrier.” Because of this, the design team believes that approximately $50,000 per year in savings did not cost the school district anything as the project was built to meet the budget and exceed the program requirements with a lower than average cost per square foot. • abouT The auThor David Toshio Williams, P.E., LEED AP is the high performance projects , principal for LHB, Inc., a 180-person A/E firm in Minnesota. Cost effectiveness The project’s mechanical, electrical, and plumbing systems cost less than a conventional AHU-based, VAV system due to less ductwork, smaller ductwork, fewer diffusers and smaller pipes. Although some additional costs were incurred to the owner due HPB.hotims.com/ 25005-1 spring 2009 HigH Performing Buildings 17 http://www.apricus.com http://www.apricus.com http://HPB.hotims.com/
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