High Performing Buildings - Spring 2009 - (Page 14) E n E r g y u s E c o m pA r E d t o h E At I n g d E g r E E d Ay s EnErgy usAgE 2006–2008 cost-savings measure. This appears to have been a good choice as no humidity-related concerns have ever been expressed by staff or users. An automated dust collector valve system allowed a smaller dust collector to serve the woodshop by leveraging the available exhaust airstream to serve only running equipment. A semi-instantaneous condensing domestic water heater supplies the group bathrooms, locker rooms, and kitchen, while point-of-use electric water heaters supply classroom sinks. This eliminates standby losses. Self-regulating electric hot water temperature maintenance systems also reduce standby losses on the hot water distribution piping to the locker rooms and pool area. The rooms’ arrangement allows plenty of natural daylight, and the lighting control systems take advantage of its availability. Lighting systems, integrated with the building management system through lighting control panels, use occupancy schedules, daylighting sensors and occupancy sensors that also function as part of the security system. In the energy usage chart, note the long thermal lag of the systems due to the uninsulated radiant slab. Indoor Air Quality TDV provides ventilation effective- ness at least 20% better than conventional mixing type systems and 40% better than all air overhead heating and ventilation systems within the occupied spaces. Design software provided by a major manufacturer of TDV diffusers recommended the use of two diffusers per room to reduce the affected zone where uncomfortable drafts can occur. 14 HigH Performing Buildings spring 2009
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