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NC-2009 IEQp1:Minimum IAQ Performance

100% OA SYSTEM?

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Weidong Luo
Ecotech International
LEEDuser Basic Member
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an AHU with no return air supplies 100% OA to an office and a conference room with FCUs, the OA supply ducts connected to the FCU supply ducts. can the entire system be considered a 100% OA system for both zones?

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Tue, 02/04/2014 - 18:59

No, you should consider each FCU as a mixed air unit serving each zone. Also, it is bad practice to connect the OA supply to the FCU supply. It should be connected to the FCU return.
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Weidong Luo
Ecotech International
LEEDuser Basic Member
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Tue, 02/04/2014 - 19:19

Andrew, many thanks. in that case, several FCUs serving one zone can be considered a larger sized single-zone system to make the calculation easier, can't they?

Tue, 02/04/2014 - 20:36

You can go that route and explain it in the form or you can divide them up into different zones. It's up to you but you need to explain what you are doing either way.

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