High Performing Buildings - Summer 2012 - (Page 13)

necessary with traditional site-built wood-framed construction. The school layout was developed with factory-made modules and delivered to site ready to be assembled in a matter of days, which reduced on-site construction time, as well as air, noise and stormwater pollution associated with on-site construction activities. The modules can be easily disassembled, relocated, and reused in the future. The modular construction system also accommodates changes in technology and allows energy and HVAC systems to serve only currently occupied areas. The project incorporates durable, low-toxicity, low-maintenance materials such as polished concrete floors, steel framing, steel roof and floor decking and fiber-cement siding. These core building materials ensure a building life cycle of more than 100 years. All construction materials were selected for their overall environmental and health performance. Products with wood, lead, and mercury were banned from the project’s structure. Pest and mold resistance were addressed through a monolithic foam over metal deck roof, steel moment-frame and metal stud infill structure, metal deck and exposed concrete floors over an insulated concrete crawlspace and fiber-cement siding. © Jim Brady Corridors, courtyards and common studio spaces become work spaces in support of this project-based-learning school. Project Finance With a $175/ft2 budget, it was clear that a large renewable energy system was not in the base budget because of the long payback period and minimal school culture benefits. High Tech High partnered with the local utility company to lease the rooftop for a photovoltaic array owned and operated by the local utility. The system feeds the community grid with renewable 2011 EnErgy UsE, ProdUction Solar PV Gas Electricity Production (therms) (kWh) (kWh) Jan. 746 565 539 396 208 285 67 62 26 85 233 422 3,634 4,037 4,196 4,590 4,716 6,184 6,187 4,882 4,398 6,151 4,867 4,113 4,232 58,552 11,186 12,327 16,505 18,562 21,037 21,609* 21,157 19,508 14,511* 14,570 9,880 9,697 154,430 2 0 1 1 o P E r at i n g c o s t s , Utility consUmPtion/ProdUction High Tech High operates 11 public charter schools in San Diego County, and the facilities team trends performance parameters, including water and energy use, to inform operations. HTH Chula Vista is the most cost-effective school to operate on both a cost per square foot and cost per student basis. This is mostly attributed to the ef cient four-pipe fan-coil mechanical system, ef cient lighting, and ease of reliance on natural daylighting for spaces. The four-pipe system was chosen for its Potable Water (Includes Central Plant and Domestic Water Fixtures) Reclaimed Water Gas (Central Boiler) Electricity PV Array Production Percent of Building Electricity Consumption Represented by PV Array Production long-term cost payback and for its demonstrated record of energy and cost savings over time. Custodial and maintenance costs are also tracked, and HTH Chula Vista’s costs are less than all other schools in the HTH portfolio. This is attributed to the low-maintenance rubber and polished concrete oors, cleanability of the restrooms, and overall durability of materials from the ber cement board walls and metal panel ceilings to the native and adaptive plants. 386,716 Gallons 1,371,832 Gallons 3,634 Therms 321,000 kWh 190,551 kWh 59.4% $4,747 $6,442 $3,293 $58,552 Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec. total Note: Electricity generated by PV panels is exported off site. *Estimated based on same month from 2010 due to missing data. Summer 2012 HIGH PERFORMING BUILDINGS 13

Table of Contents for the Digital Edition of High Performing Buildings - Summer 2012

High Performing Buildings - Summer 2012
Commentary
Contents
High Tech High Chula Vista
Kiowa County Schools
Northwest Maritime Center
La Reunion’s ENERPOS
Wilfred Uytengsu Sr. Center
Products
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High Performing Buildings - Summer 2012