High Performing Buildings - Spring 2009 - (Page 11) cross sEction Energy Efficiency This project performed in the 85th percentile of school projects with a site Energy Use Intensity (EUI) of 56 kBtu/ft2 ยท year during the 2006 calendar year. Limited cooling capacity was provided due to the few days per year that cooling is needed. Early on, the design team focused on dedicated outdoor air systems (DOAS) delivering air through thermal displacement ventilation (TDV) diffusers and high delta T low temperature hot water distribution as techniques to reduce energy consumption. By moving air only for ducted ventilation and using high delta T hot water distribution, energy transport loads were reduced. Additional reductions in transport and heating energy were achieved by instituting demand controlled ventilation in the classrooms, providing an average of only 30% maximum airflow for room ventilation during school hours, or the equivalent of 15 cfm per person for normal classroom occupancy, and using a spring 2009 150% CO2 override set point for high occupancy conditions. Preconditioning of the outside air relies on energy recovery ventilators using membrane type fixed cores and conventional central station air-handling units equipped with MERV 13 filters and heating coils. A smaller, distributed mechanical room allowed the DOAS air handlers and ductwork to be limited in size and length by being close to the areas served (another transport energy reduction technique). Performing Buildings 11 HigH
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