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NC-2009 IEQp1:Minimum IAQ Performance

non default occupancy numbers

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Veronika Sundberg
Environmental Engineer - Certification
Skanska Sverige AB
LEEDuser Basic Member
94 thumbs up

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 Leader
DLR Group | Westlake Reed Leskosky
LEEDuser Expert
267 thumbs up

Tue, 09/27/2011 - 14:58

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?
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Veronika Sundberg
Environmental Engineer - Certification
Skanska Sverige AB
LEEDuser Basic Member
94 thumbs up

Mon, 10/03/2011 - 08:56

Exactly, is it enough to explain, or should we write a CIR for the rooms considered? Thank You
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Roger Chang
Principal, Energy and Engineering Leader
DLR Group | Westlake Reed Leskosky
LEEDuser Expert
267 thumbs up

Wed, 11/02/2011 - 19:46

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.
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Veronika Sundberg
Environmental Engineer - Certification
Skanska Sverige AB
LEEDuser Basic Member
94 thumbs up

Thu, 11/03/2011 - 07:46

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.

Thu, 11/03/2011 - 18:20

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.

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