Air-Handling Systems, Energy, and IAQ - Trane
Air-Handling Systems, Energy, and IAQ - Trane
Air-Handling Systems, Energy, and IAQ - Trane
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dedicated OA system<br />
Dem<strong>and</strong>-Controlled Ventilation<br />
67<br />
SA<br />
© 2009 <strong>Trane</strong><br />
VAV box<br />
OA<br />
local HVAC unit<br />
RA<br />
VFD<br />
CA<br />
dedicated<br />
OA unit<br />
CA OCC CA<br />
CO 2<br />
Benefits of Chilled-Water DOAS<br />
68<br />
© 2009 <strong>Trane</strong><br />
RA<br />
SA<br />
� Can achieve lower dew points<br />
� Wider operating envelope<br />
• Especially when using variable airflow<br />
• DX equipment often requires<br />
hot gas bypass (energy waste)<br />
� Greater flexibility <strong>and</strong> efficiency<br />
• Fans, air cleaning, energy recovery,<br />
desiccant wheel, airflow measurement,<br />
ice storage<br />
� Certified performance<br />
• ARI, UL, ETL<br />
• No ARI certification for DX dedicated<br />
OA units (EER’s typically not published)<br />
� Reduced refrigerant charge<br />
© <strong>Trane</strong>, a business of Ingersoll R<strong>and</strong> 36
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