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:
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[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

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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
15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219

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