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,
Ilona Johnson, PE, CEM, LEED AP
AssociateLilker EMO Energy Solutions
8 thumbs up
March 17, 2014 - 9:35 am
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!
Noriko Nagazumi
Woonerf Inc.74 thumbs up
March 20, 2014 - 2:07 am
Thank you Ilona!