High Performing Buildings - Spring 2008 - (Page 24) the basement below draw restroom air through the toilet fixtures and compost bins before being exhausted through ducts routed to the highest part of the building roof. The continuous ventilation and the green roof directly above the restrooms result in relatively comfortable restroom temperatures year-round. Also, the exhaust system draws air down through the toilets instead of up to the ceiling to effectively control odor. • Electricity is the building’s sole energy source. The estimated annual grid-supplied, regulated electricity (with CO2 demand-controlled ventilation included, but not counting the photovoltaic panel generation) decreased from 117,150 kWh to 70,140 kWh with the proposed building. The CO2 based demand-controlled ventilation system contributes 5,990 kWh to the annual electrical energy savings by reducing the cooling and F I G U R E 1 S O L A R P H O T O V O LTA I C S Y S T E M F O R S W E E T W AT E R C R E E K V I S I T O R C E N T E R 10.5 kW Photovoltaic System (4.5 kW Evergreen, 6 kW BP Laminate) The basement zone for the composting bins is heated only to protect the space from freezing. Annual Estimated Production Estimated Emissions Avoided 52 lb of NOx 14,124 kWh 142 lb of SO2 24,043 lb of CO2 The museum display lighting is not included in the regulated energy, per the allowed exception to Section 9.3.1 of Standard 90.1-1999. This encompasses a total floor space of 2,092 ft². • 1,300 lb of NOx Lifetime (25 Years) 353,100 kWh 3,550 lb of SO2 601,075 lb of CO2 Energy Model Development The eQUEST 3.55 (DOE-2.2) building energy simulation package was used to model the energy use. The proposed building was modeled on construction drawings, while the budget building was modeled in accordance with Standard 90.1-1999 and LEED requirements prescribed for the climate. Using the procedures built into the eQUEST program, the energy modeling analysis includes CO2 based demand-controlled ventilation. Without the CO2 based demandcontrolled ventilation, but including the contribution of the photovoltaic panels, the proposed design building results in energy cost savings of 46% compared to the LEED budget building. The inclusion of the CO2 based demand-controlled ventilation results in additional savings of 5%, giving total energy cost savings of 51%. 24 HIGH PERFORMING BUILDINGS Production numbers based on Atlanta latitude of 33.65 N, fixed array with 34° tilt, 10.5 ac rating, 8.1 dc rating and 0.77 dc to ac derate factor. FIGURE 2 ELECTRIC ENERGY USE FOR BUDGET AND PROPOSED BUILDINGS Spring 2008
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