High Performing Buildings - Spring 2009 - (Page 9) farmed site, which slopes toward Lake Superior, was partially covered with mixed forest and wetlands. The region’s impermeable layers of clay and rock have led to the formation of many wetlands in the area. Natural gas, three-phase power and city water and sewers were extended from the nearby utilities to the site. High on the school district’s list of priorities for the new school were low operating costs and an improved indoor environment. The design of the 800-student, sixth to 12th-grade school met the district’s goals for a durable, low-maintenance facility with multi-use spaces that also serves the community’s residents. This high performance project was delivered at $127 per square foot, lower than the $161 per square foot average for school projects bid in the state of Minnesota in 2005. The design team’s sustainable design practices provided benefits beyond the initial vision. the new site with the town and other nearby recreational areas. The parking lots were created without curb and gutter to enhance the performance of the storm water management system. site Management A number of high performance design features were included in the site design. The use of native plantings and limited grass areas resulted in no fixed irrigation, with only the main competition field being irrigated. Ninety-five percent of the storm water that hits the site is retained. A system of paved walking and bicycle paths was created to link Architectural Integration The building sections allow enhanced performance of the daylighting controls and ventilation systems. The mechanical systems selected reduce the amount of ductwork, which enhances the building section design. Longlasting exterior materials, such as brick and zinc cladding contribute to the long service life expected for this project. Photo © lHB In 2006, Two Harbors High School ranked in the 85th percentile of school projects for its energy use intensity of 56 kBtu/ft2 · year. The school’s energysaving features include a thermal displacement ventilation diffuser, a low temperature high delta T hydronic heating system that distributes hot water out to a radiant floor system, demand controlled ventilation and automated lighting systems. spring 2009 HigH Performing Buildings 9
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