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NC-2009 IEQp1:Minimum IAQ Performance

ERV and multiple fan coil units

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Courtney Royal
Sr. Sustainability Consultant
Taitem Engineering
LEEDuser Basic Member
36 thumbs up

Hello, I've only completed the ventilation spreadsheet a few times and have a few questions. Thanks!

The project has an Energy Recovery Unit which feeds multiple ducted fan coil units within the project space. My question is, would I enter the ERV as a multiple zone or 100% OA system on the ventilation spreadsheet?  Or do I need to enter each of the nine fan coil units as a "system?"  I am confused because the fan coil units are just the distribution for the rooftop ERV and I am unsure how to report on the spreadsheet.

Thanks so much!

Courtney

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Mon, 03/26/2018 - 17:33

I would treat each fan coil as its own system with an OA duct attached.  As far as ventilation calculations go, it really doesn't make a difference that it is conditioned.
Profile picture for user croyal
Courtney Royal
Sr. Sustainability Consultant
Taitem Engineering
LEEDuser Basic Member
36 thumbs up

Wed, 03/28/2018 - 15:36

ok, thank you Andrew! How should I handle exhaust only spaces? Restrooms, server room, etc. in the spreadsheet? Thanks!

Wed, 03/28/2018 - 18:40

For exhaust driven spaces, they will not be included in the spreadsheet.  You will need to provide a narrative including space and types that are not in there and why.  I usually also include spaces like shafts, chases and hoist ways in order to demonstrate why the calculated square footage is different than the building GSF.  It is not something I think we should have to do, but unfortunately, we almost always need to do it.
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Jalal Avades
President
AGR Consulting, LLC
LEEDuser Basic Member
14 thumbs up

Mon, 06/11/2018 - 22:25

Hi Andrew, Does the discharge from the ERV needs to physically connected to the fan coil(s) return plenum; or OA is discharging to above the ceiling close by the fan coil return opening is sufficient?

Mon, 06/11/2018 - 22:38

Hi Jalai, we have placed the discharge close to the fan coil in many projects and we have never had this prerequisite denied for this reason. As far as I know, this is a common practice permitted by ASHRAE 62.1.

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