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CI-2009 IEQp1:Minimum IAQ Performance

Multi-zone system when single AHU supplying OA to FCUs?

We have 2 AHUs supplying OA to individual FCUs via a separate duct as per ASHRAE 62 intake requirement. The mixing occurs at the individual FCUs and then supplied to the zone. In such a scenario, should we consider it a Multiple-zone system or single-zone system? Thanks!

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Roger Chang
Principal, Energy and Engineering Leader
DLR Group | Westlake Reed Leskosky
LEEDuser Expert
267 thumbs up

Thu, 11/14/2013 - 13:49

Poorva, if an individual FCU provides ducted supply to more than one zone (with significantly different thermal load characteristics), you'll still need to use the multi-zone calculation approach in ASHRAE 62 for each FCU. If the FCUs are zoned appropriately, you'll be able to use a single-zone approach, which simplifies the required calculations.

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