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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

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EBOM-2009 IEQp1:Minimum IAQ Performance

Pz - Zone Population real vs default occupant density

Hello. On 6.2.2.1 Breathing Zone Outdoor Airflow, I read "Note: If Pz cannot be accurately predicted during design, it shall be an estimated value based on the zone floor area and the default occupant density listed in Table 6-1." For existing buildings as well, Pz shall be calculated using actual occupancy, instead of calculated using the default density? Thanks in advance,

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Mon, 03/17/2014 - 13:35

Hi Noriko, Your calculations are supposed to be based on actual occupancy for this credit. From a code perspective for new construction projects, you should use the actual number of occupants if known, and use the ASHRAE default occupants if the number is unknown. However, if you are documenting this credit for the LEED EB rating system, then you can always take a count of the occupants in the building. LEED reviewers expect you to use the actual number of people in the building to estimate outdoor air requirements. Ensure your occupant count is consistent with the occupants reported for all other credits. I hope that helps!

Thu, 03/20/2014 - 06:07

Thank you Ilona!

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