High Performing Buildings - Spring 2009 - (Page 13) Photo © John gregor, Coldsnap Photography The media center is one of the air-conditioned areas in the building. Thermal displacement ventilation allows the space to remain open to the atrium above. something the design team thought was necessary to successfully apply TDV cooling. The hydronic heating system distributes hot water out to the building at 140°F and returns it to the boilers at 100°F. This water temperature was a good match to the design radiant floor temperature of 80°F and allowed the German-made stainless steel condensing boilers (natural gas or propane/air mix) to achieve high combustion efficiencies. Air-handling coils and the limited amount of perimeter radiation and unit heaters did require larger coil sizes to compensate for the low water temperatures. A combustion air control system increases the spring 2009 boiler plant efficiency further by preheating the combustion air. The school is equipped with a championship swimming pool. An engineered pool energy recovery unit processes pool area ventilation air. The design team considered a refrigerant dehumidification unit, but the simpler unit was selected as a Performing Buildings 13 HigH
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