Rudolph, the Ventilation Rate Procedure (in theory) should ensure that Vbz is met at all zones in a multizone system. This is why Vot is frequently a larger volume of air than the sum of all Vbz of all constituent zones.

Rudolph Carneiro

HVAC consultant

Optimized Systems

LEEDuser Basic Member

19 thumbs up

Thu, 10/03/2013 - 01:46

Thank you. The Ev division at the end makes that true. It seems unfortunate that critical zones are not guaranteed their respective Vbz values when the system is at full blast. Related question: If a system is in compliance with the VRP Vot minimum, when the Vot is increased to assure that all zones meet the increased ventilation credit, could you potentially need a greater Vot than the supply air flow rate of the entire system? In other words, can the increased ventilation rate credit force a system to need more total supply air?

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