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CI-2009 EAc1.3:Optimize Energy Performance—HVAC

CAV - How to meet section 3.1 requirement

Hi, For one of my LEED CI project, air distribution is a CAV system. There is a VFD for AHU though. To document EA c 1.3, i need to meet CPG requirement. But Sec 3.1 of core performance guide specifically says that VFD should be for VAV systems. In this regard can i still meet the compliance by showing VFD for CAV system? Please clarify Thanks Sriman

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Rudolph Carneiro
HVAC consultant
Optimized Systems
LEEDuser Basic Member
19 thumbs up

Thu, 03/21/2013 - 17:39

I'm guessing you meant section 3.10 and not 3.1? I'd say that they are not applicable since the VFD will never ramp down the AHU to 50% of it rated flow. The VFD in this case reduces the energy consumption and maintins flow with small flutuations in fan speed, but should not go as far down as 1/2 the flow rate.

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