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What is a loop duct? Glad you asked. It involves less ductwork, simpler duct runs, easier system expansion, less demolition if switching from constant volume to VAV, a maneuver for handling solar load shift, and more. For when to use it, why to use it, and how to design it, read on.
Engineered Systems
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July 1, 2006|
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COPYRIGHT 2006 BNP Media. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group.
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A loop duct is a distribution layout that is joined at the ends. Supply air can feed a zone control device from two or more paths. This arrangement can be helpful when faced with any of the following circumstances:
* Ceiling space is limited;
* Air supply qualities vary as the solar load shifts;
* An expansion is planned for the facility;
* The system is being converted from a constant volume zoned arrangement to VAV;
* Redundant supply air is important; or
* Cost reduction of sheet metal ductwork is desired.
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