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.
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Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
November 10, 2011 - 6:55 pm
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.