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

[Melissa Crowe]

When the answer to a Nick question seems simple I do doubt myself.....



I assume yall know this but the reason I use EIR FPLR is to change the curve used based on the application.  Ie ASHRAE 90.1 fan curve.

 There is an ASHRAE paper out there that defines curves for static reset.  . Jeff Stein and Mark Hydeman's "Development and Testing of the Characteristic Curve Fan Model, ASHRAE Transactions, January 2004
I use these in utility studies to justify energy savings

[cid:image004.png at 01D5EE55.E558CA90]

Melissa Crowe, LEED AP, BEMP
508-647-9200 ext. 1225



From: Nicholas Caton <Nicholas.Caton at se.com>
Sent: Friday, February 28, 2020 9:56 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Quirk I've wondered about - Fan EIR-fPLR

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:image002.png at 01D5EE55.161BF720]
[cid:image005.png at 01D5EE55.161BF720]

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:image006.jpg at 01D5EE55.161BF720]
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:image007.png at 01D5EE55.161BF720]



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20200228/1718e8e6/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.png
Type: image/png
Size: 40244 bytes
Desc: image002.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20200228/1718e8e6/attachment-0008.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image005.png
Type: image/png
Size: 15745 bytes
Desc: image005.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20200228/1718e8e6/attachment-0009.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image006.jpg
Type: image/jpeg
Size: 1794 bytes
Desc: image006.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20200228/1718e8e6/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image007.png
Type: image/png
Size: 8477 bytes
Desc: image007.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20200228/1718e8e6/attachment-0010.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image004.png
Type: image/png
Size: 44236 bytes
Desc: image004.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20200228/1718e8e6/attachment-0011.png>