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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

Ashrae 62.1 vetilation rate - Constant OA with VAV system

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Bradford Crosby
Commissioning Resources, Inc.
LEEDuser Basic Member
0 thumbs up

We have a constant volume air fan feeding many floors. It feeds the mechanical space using it as a plenum. At the floor level there is a Supply fan serving the VAV and Fan boxes. The floor AHU only has a cooling coil, the heat is provided by reheats. Is it correct to use the maximum cfm for Vdzd and 100% for the Ds? When I use the minimum cfm for this calculation the required OA actually drops.

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Ante Vulin
Sustainability Manager
YR&G
LEEDuser Basic Member
55 thumbs up

Tue, 12/11/2012 - 18:54

You will have to select the appropriate values for the worst case scenario for the floor level fan systems. In a typical VAV system, the worst case scenario is during heating mode, when system fan flows and zone air flows are both lower than 100% of design levels. However, you will have to experiment in the 62MZ calculator to determine which condition actually creates the highest requirement for outside air.

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