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FAQs about IEQp1 :

What if after our Preliminary Review we have to re-work the ventilation rate procedure calculations and find that we need to make corrections to the system in order to meet the prerequisite? Can we redo the outside air testing after making corrections? Wo

What if our systems do not meet the required outside air when systems are tested at worst-case conditions?

Our building has a single fan that supplies outside air to multiple AHU’s. Do we need to perform outside air testing at the supply fan or at all AHUs?

We have a VAV system where single AHUs serve multiple zones. Do we need to take outside air measurements at each VAV box?

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EBOM-2009 IEQp1:Minimum IAQ Performance

Vacancy - EQp1 Calculations

We have a floor that is vacant in our project building. In performing EQp1 calculations, I assume that # of occupants given for each zone should sum up to the total building occupants for other credits. Is this correct? This is a bit tricky in establishing regular building occupants vs. daily peak occupants vs. hourly peak occupants, ultimately to establish the appropriate input (Pz) for the calculator. Is there any clarification you can provide on this? Also, because one of our floors is vacant, we will only show we are meeting fresh air requirements based on current occupancy. Is that correct?

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Tristan Roberts
Representative
Vermont House of Representatives
LEEDuser Expert
7780 thumbs up

Tue, 02/08/2011 - 13:44

I am a bit confused by the wording of your question, but I'll try to answer based on my understanding. The requirements for this prerequisite involve ensuring that the HVAC system can meet the needed ventilation loads of the space. If it is an office space, the HVAC should be able to meet the needs of that space as designed (with occupants), not as it currently stands (vacant). In your case I would come up with reasonable occupancy numbers for the vacant floor based on numbers from other floors.
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Dave Madsen
Director of Engineering & Sustainability
Qualis Group LLC
LEEDuser Basic Member
15 thumbs up

Fri, 12/02/2011 - 13:23

I want to make sure I'm understanding this correctly... Even if we have a vacant space, we should use the default space type density to assume that we have occupants in the space. Then we should calculate our required ventilation based on the default occupant density even though the space is vacant. --- With that being said, since during the performance period we are only required to take one measurement of the outside air, if we are able to show that the AHU for that vacant space can supply sufficient OA, are we able to return the space to "unoccupied (i.e. shutdown OA to vacant space) to save energy? Basically it seems to me that we should be able to demonstrate that the system can supply enough OA if it were occupied, without actually having to do so since the space is vacant.

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