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
Rudolph Carneiro
HVAC consultantOptimized Systems
26 thumbs up
March 21, 2013 - 1:39 pm
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.