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Air Handling Unit (AHU)
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CDQ Air Handling Unit
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|  | | | CDQ - How it Works
The Trane CDQ desiccant wheel is used to enhance the dehumidification
performance of a traditional cooling coil. The wheel is configured in series
with the coil such that the "regeneration" side of the wheel is located
upstream of the coil, and the "process" side of the wheel is located
downstream of the coil. The CDQ desiccant wheel adsorbs water vapor from
the air downstream of the cooling coil, and then adds it back into the air
upstream of the coil, where it is removed by the coil through condensation.
This is accomplished without the need for a second regeneration air stream.
CDQ Benefits
• Increased cooling coil latent (dehumidification) capacity
• Lower supply air dew points
• Decreased need for reheat
• Lower unit cooling sensible heat ratios (SHR)
• Warmer required chilled-water temperatures
• Decrease the required cooling capacity when dehumidifying
• Exhaust air is not required
• All electric system – no “expensive” gas heat needed
CDQ Engineeting Bulletin
ASHRAE 2006 - Dehumidification System Enhancement
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