[Equest-users] Fan Control

[Molly Curtz]

Tony, 
 
As I understand it, the fan control settings offered such as "Discharge"
just set an assumption for the fan part load performance curve (EIR
FPLR) used in the simulation.
You can either use one of the predefined fan performance assumptions, or
define your own using "Fan EIR FPLR"
 
When you set FAN-CONTROL to "Discharge", then right click on the Fan EIR
FPLR and 'restore default' it will revert to n/a. It will not do this
when you have FAN-CONTROL set to "Fan EIR FPLR"
 
I'm not sure which takes priority if you have both FAN-CONTROL set to
"Discharge" and a custom Fan EIR FPLR input. You could easily run some
tests and see.
 
Kind Regards,
 
Molly Curtz, P.E.
Mechanical Engineer
 
Arup
403 Columbia St., Suite 220
Seattle, WA 98104
direct: 206 493 2234
tel: 206 749 9674 ext. 25534
fax: 206 749 0665
molly.curtz at arup.com
www.arup.com <http://www.arup.com/> 
 

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Tony
Kriel
Sent: Tuesday, March 10, 2009 2:39 PM
To: equest-users at lists.onebuilding.org; bldg-sim at lists.onebuilding.org
Subject: [Equest-users] Fan Control



We have a bit of an in-office argument going on and I was wondering if
people could share some insight on the subject.

 

Situation:

A user has a VAV system with dampers at the VAV boxes and a VFD on the
supply fan.  To properly model this, would the user make sure that the
Fan EIR is 'Variable Speed Drive FPLR' and then change Fan Control to
'Discharge' or leave it as 'Fan EIR FPLR'?

 

If you are supposed to leave the fan control dialogue as 'Fan EIR FPLR'
then what is the purpose of being able to change the fan control if you
have already selected the appropriate Fan EIR curve?

 

Thanks for helping solve the in-office dispute,

 

Tony Kriel, LEED AP

Mechanical Engineer

tkriel at sustaineng.com

(608) 231-9664 ext. 16

 

Sustainable Engineering Group, LLC.

431 Charmany Drive, Suite 102

Madison, WI 53719

www.sustaineng.com 

 

<mailto:tkriel at sustaineng.com>  

 

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