See all forum discussions about NC-2009 IEQc2
 Subscribe to new posts about NC-2009 IEQc2 Post a new question aboutNC-2009 IEQc2
See LEEDuser’s guidance on NC-2009 IEQc2»
FAQs about IEQc2 :

Does each individual zone need a 30% increase in ventilation, or can a weighted average be used for the building?

Do spaces which are not regularly occupied require increased ventilation?

View answers »

Forum discussion

NC-2009 IEQc2:Increased Ventilation

Increase in Ventilation - Precentage

Profile picture for user andre.knutsson
André Knutsson
Environmental engineer - Mc S. Civile Engineering
YIT Buildings Systems AS
LEEDuser Basic Member
25 thumbs up

We are using VAV in some zones of the office building project we are building. When calculating the %-increase in ventilation for the IEQ c2, I wonder what VAV airvalue to use? The VAV air handlers have 3 values of air, Max - Nominal - Basic. 62.1 in 6.2.5.1 gives directions for use of Basic air volume when calculating Primary Outdoor Air Fraction. My guess would be the Nominal air flow value should be used, this due to the increase in the air supply to theoffice when the KNX detector register an entrance.

2
Post a reply

You rely on LEEDuser. Can we rely on you?

LEEDuser is supported by our premium members, not by advertisers.

Go premium for $15.95  »

Profile picture for user dconnelly
Dylan Connelly
Mechanical Engineer
Integral Group
LEEDuser Expert
342 thumbs up

Thu, 11/10/2011 - 23:55

One of the most confusing part of this credit is Primary Outdoor Air Fraction (Zp). And I believe LEED just updated their forms as well. Zp refers to the ratio of the OSA requirement for a space divided by the minimum CFM supply setting (e.g. VAV min box cfm) for that space – the understanding being that as supply air becomes more concentrated with OSA, that OSA is less effective and doesn’t get used by the people prior to being returned to the air handler. The Ev (efficiency) calculation, is related to the Max Zp value of all the rooms served by a common air handler.

Add new comment

To post a comment, you need to register for a LEEDuser Basic membership (free) or login to your existing profile.