High Performing Buildings - Spring 2009 - (Page 12) Minimal duct was required due to the system design. This complemented the visual appeal of assembly spaces. Conventional return air type central station units serve the media center and administrative suites, while ceiling cassette minisplit units serve the computer instruction areas. A thermal displacement ventilation (TDV) diffuser from the air-handling units serves the small amount of air-conditioning load. The air-conditioning AHU uses chilled water coils fed by small, air-cooled water chiller units with integral pumps and chilled water buffer tanks. The chilled water allows the discharge air temperature to be controlled to a closer tolerance, Traditional cast-iron mushroom floor diffusers are used in the theater area for the TDV supply. The theater was designed without air conditioning, but since community groups use it year-round, there are times during the warmer months when air conditioning would improve comfort. 12 HigH Performing Buildings spring 2009 Photo © John gregor, Coldsnap Photography Photo © John gregor, Coldsnap Photography
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