High Performing Buildings - Summer 2012 - (Page 21)

key SuStAinAble feAtureS Water Conservation Low ow xtures, waterless urinals, xeriscape indigenous landscaping, rainwater capture/reuse for irrigation using ve aboveground steel cistern tanks (four with 14,780 gallon capacity and one with 10,139 gallon capacity) and one 50,000 gallon underground berglass cistern tank. Materials Exterior wood from Hurricane Katrina deadfall. Interior wood siding and furring/blocking from warehouses in Missouri and California. • 46% of the wood (based on cost) is FSC certi ed. • 24% of the materials (based on cost) are recycled. • 27% of the materials (based on cost) are local/regional materials. Daylighting All normally occupied spaces, except distance learning classrooms, receive natural light, which is provided by north facing clerestories in classrooms and the gymnasium. Daylighting control accomplished with dimming ballasts and photocell control in each space. Individual Controls Individual temperature controls and operable windows in classrooms. Either individual temperature control or operable windows in of ces. Other Major Sustainable Features Geothermal closed loop ground source heat pump system, on-site 50 kW wind turbine (8% of net energy needs), remainder of electricity from community wind farm, SIPS panel exterior wall system, sunshading device at south facing windows. © Assassi Circulation spaces are organized around a central courtyard. The multiple windows provide views of nature, outdoor activity and the academic community. Supporting Academic Achievement The design provides distinct areas for kindergarten, elementary, middle and high school grades to give students learning and social opportunities that are age appropriate. Two single-loaded academic wings, each with an east-west orientation, optimize solar orientation and prevailing breezes. The lower and middle schools are in the southern wing, which bends to allow three distinct school zones. The high school is located on the second floor in the wing to the north and is placed above key support functions including the cafeteria/kitchen and distance learning facilities. The district understood the importance of daylighting for increasing student academic performance. The design effort focused on daylight optimization in occupied spaces because of the recognized positive impact on cognitive ability and academic performance. Detailed daylighting models and analysis allowed the design Summer 2012 HIGH team to properly place and size the windows, including skylights in the corridors, for optimal performance. During normal school operating hours, electric lighting is not required except in the few e n e r g y At A g l A n c e Annual Energy Use Intensity (Site) 29.2 kBtu/ft2 Natural Gas 4 kBtu/ft2* Electricity 22.8 kBtu/ft2 Renewable Energy 2.4 kBtu/ft2 Annual Source Energy 83 kBtu/ft2 Annual Net Energy Use Intensity 26.8 kBtu/ft2 Savings vs. Standard 90.1-2004 Design Building 64.8% Heating Degree Days 3,983 Cooling Degree Days 2,705 *Due to a metering problem, natural gas data is not available prior to October 2011. Gas use is extrapolated based on October 2011–January 2012 data. The mechanical system is a ground source closed loop heat pump, which reduces maintenance requirements because there are no condensers. The project is powered by natural gas and electricity from an on-site wind generator and the city’s wind farm, which supplies the entire town of Greensburg with 100% renewable energy. w At e r At A g l A n c e Annual Water Use 617,000 gallons (2010–11) The projected water use for the building ow and ush xtures alone based on calculations for LEED was 1,396,928 gallons (40% below the baseline). The total first year water use water is 617,000 gallons, which is 779,928 gallons below the projection. These numbers include any water used for this rst year of landscape establishment. PERFORMING BUILDINGS 21

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High Performing Buildings - Summer 2012
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High Performing Buildings - Summer 2012