High Performing Buildings - Winter 2011 - (Page 65)

pressure and thermal losses, further improving energy efficiency. Plate and frame heat exchangers are provided for waterside free cooling and a separate circuit is provided for after-hour and 24-hour loads. For space and domestic hot water heating, the building connects to a district steam heating system. A cascade approach converts the steam to space heating hot water and then recaptures the waste heat from steam condensate, which is used as the source for the domestic hot water. An extensive analysis of the predicted passive daylight performance informed the development of the lighting layout and controls. In the daylight zones of the southeast and southwest exposures, a series of interior automated venetian blinds are installed above the lightshelves and exterior sunshades. The blinds follow the solar position using a timing control sequence to maximize useful daylight and minimize glare throughout the varied conditions of the solar calendar. Zoning and dimming solutions are designed to work closely with the daylight control systems, optimizing the use of electric lighting power against the added cooling load of entering solar radiation. The system redirects daylight down through the atrium to light the common space at the floor level and office floor plates above, while protecting occupants near the atrium walls on the upper floors from the sun’s glare. Above left The building interior is 85% naturally lit, using interior shades, exterior fins and parabolic sails in the atrium to manage daylight, solar heat gain and glare. These strategies, along with an integrated lighting control system, help reduce building energy use. Above right South-facing canvas sails suspended from the top of the atrium redirect sunlight downward and prevent glare. A Portland sail making company fabricated the sails, and a Denver theatrical rigging company employed rock climbers to hang them. Modeled veRSuS ACtuAl eneRgy uSe 2007–2009 electricity steam syska Hennessy group, northmarq This chart compare the DOE-2 energy modeling data with the actual energy consumption data for the building’s first three years of operation. The energy modeling data reflects the final figures that were included for the LEED certification submittal and has not been calibrated to actual building operation. Therefore, discrepancies appear between the model data and actual utility bill data, which can occur when actual data is compared with the design model data. © robert Canfield Winter 2011 HigH Performing Buildings 65

Table of Contents for the Digital Edition of High Performing Buildings - Winter 2011

High Performing Buildings - Winter 2011
Commentary
Contents
Portland State's Shattuck Hall
Oberlin College's Adam Joseph Lewis Center
Dell Children's Medical Center
CMTA Office Building
EPA Region 8 Headquarters
Honda's East Liberty, Marysville Auto Plants
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High Performing Buildings - Winter 2011