Forum discussion
NC-2009 IEQp1: Minimum IAQ Performance
We want to use non default occupancy values for some rooms in our project. Do anyone have experience what the reviewers might have for thoughts regarding this. We will describe why we don’t use the default values.
Thanks /Veronika
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Roger Chang
Principal, Energy and Engineering LeaderDLR Group | Westlake Reed Leskosky
LEEDuser Expert
398 thumbs up
September 27, 2011 - 10:58 am
Veronika, the main reason not to use the default occupancy numbers is when there's a furniture plan with a defined number of seats. This may apply to a conference room, office, performing arts theater, or cafeteria. What's your particular situation?
Veronika Sundberg
Environmental Engineer - CertificationSkanska Sverige AB
120 thumbs up
October 3, 2011 - 4:56 am
Exactly, is it enough to explain, or should we write a CIR for the rooms considered?
Thank You
Roger Chang
Principal, Energy and Engineering LeaderDLR Group | Westlake Reed Leskosky
LEEDuser Expert
398 thumbs up
November 2, 2011 - 3:46 pm
There is Note 4 for Table 6-1 in ASHRAE 62.1: "4 Default occupant density: The default occupant density shall be used when actual occupant density is not known." I would make a definitive statement that you have a known design occupancy that's approved by the Owner/Client and/or based on an actual furniture/seat count.
Veronika Sundberg
Environmental Engineer - CertificationSkanska Sverige AB
120 thumbs up
November 3, 2011 - 3:46 am
Okej, good to know. then we will reference to the design values for the rooms given by the client. theese are some conference rooms but also rooms with only one bed for one patient. Thank you Roger.
Susan Walter
HDRLEEDuser Expert
1296 thumbs up
November 3, 2011 - 2:20 pm
Watch out on how these values will affect other credits, especially the lighting and thermal control credits. In those credits, the seating plan can throw off your calculations especially in healthcare group work areas.