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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

ASHRAE 62.1-2007 in Warehouses

We are working on a project with very large warehouses with massive roof-mounted air handling units and relatively low occupancy. A 60,000 sf facility may only have 8 workers for example. Do we need to account for the size of the building in our outdoor air ventilation supply, or if the total outdoor air entering the space is more than the required minimum per person does that suffice? I have no doubt that we are supply more outdoor air than needed for the 8-10 workers, but am concerned if the dilution by the large building size needs to be taken into account. Thanks,

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David Hubka
Director of Operations
Transwestern Sustainability Services
LEEDuser Basic Member
355 thumbs up

Wed, 08/24/2011 - 11:35

Table 6-1 of ASHRAE 62.1-2007 requires warehouses to be provided with 0.06 CFM of outdoor air per square foot during occupied hours. Project teams must account for both people and area when calculating outdoor air rates.
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Julia Weatherby
President
Weatherby Design & Co. Engineers
LEEDuser Basic Member
67 thumbs up

Wed, 08/24/2011 - 14:10

For the EBOM rating system, I believe that for each piece of equipment that you determine is not capable of fully meeting ASHRAE 62.1, you have the alternate option of documenting that you have at least 10 cfm/person. I do not recall anything in the alternate option about accounting for square footage. This makes sense to me, because most existing buildings were designed when ventilation rate charts were based on occupancy for most spaces, and not floor area.

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