[Equest-users] Quirk I've wondered about - Fan EIR-fPLR

Nicholas Caton Nicholas.Caton at se.com
Fri Feb 28 06:56:08 PST 2020


eQuest wizards, if specifying a VAV, will generate systems using a library curve and the following 2 lines:

FAN-CONTROL = FAN-EIR-FPLR
FAN-EIR_FPLR = "Variable Speed Drive FPLR"

Looks like this in the interface:
[cid:image005.png at 01D5EE14.09A4F5A0]
[cid:image001.png at 01D5EE13.1BEBDF90]

Is there a practical reason this approach is taken in lieu of FAN-CONTROL = SPEED?  Does one input option perhaps predate the other?  Do these approaches result in different effective curves to describe net fan/motor/VSD effects as a function of flow?  Do these approaches perhaps interact differently in the presence of a MIN-FAN-RATIO?

I am being lazy here - but if someone has a slow afternoon, some of these open questions would be easy enough to quantify with a dummy model and some custom hourlies =).

~Nick

[cid:image003.jpg at 01D5EE14.E92A2E70]
Nick Caton, P.E., BEMP
  Senior Energy Engineer
  Energy and Sustainability Services
  Energy Performance Contracting
D
M
E

913 . 564 . 6361
785 . 410 . 3317
nicholas.caton at se.com<mailto:nicholas.caton at se.com>
15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219

[cid:image004.png at 01D5EE13.1BEBDF90]


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