[Equest-users] Cooling coil leaving temp error

Chris Lowen CLowen at glumac.com
Wed Nov 6 18:10:37 PST 2013


If you want to bypass the error completely you can set your chilled water supply temperature lower (say 41) to satisfy the 6 Deg delta T eQuest is looking for and then use a temperature reset schedule to have the chilled water loop operate where you want it too. Good trick for low air temp systems where this error gets in the way.

Chris Lowen, P.E.
Energy Analyst
Northern Region Energy Director
LEED AP BD+C

GLUMAC engineers for a sustainable future(tm)

900SW Fifth Ave, Suite 1600
Portland, OR 97204

Office:   503.227.5280
Direct:   503.345.6348
Email:   clowen at glumac.com<mailto:clowen at glumac.com>

glumac.com<http://www.glumac.com/>
_____________________

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Hall, Brendan
Sent: Tuesday, November 05, 2013 1:34 PM
To: Sami, Vikram; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Cooling coil leaving temp error

I would say that is the likely culprit. The commonly used keyword is zone entering temperature (MIN-SUPPLY-T), not the coil leaving temperature. The coil temperature will be variable depending on how much heat gain the fan provides and the throttling range of the coil controller. In this case, the coil leaving temperature would likely be around 50 degrees if you have that much fan gain and I could see that generating that error. 5 degrees is on the high side for a fan, so check what number you are using to determine what the power input is. I always use the bhp not the nameplate to determine the kw/cfm of the fans.


Brendan Hall,  PE, LEED AP BD+C
Engineer, Mechanical
karpinski
ENGINEERING
3135 Euclid Avenue
Cleveland, OH  44115
P  216.391.3700<tel:216.391.3700> Ext 3111
E  bhall at karpinskieng.com<mailto:bhall at karpinskieng.com>
W www.karpinskieng.com<http://www.karpinskieng.com/>



From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Sami, Vikram
Sent: Tuesday, November 05, 2013 4:02 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Cooling coil leaving temp error

I'm running a simulation where I get the following error:


In EL1 Sys1 (VAVS) (G)             , cooling coil leaving temperature must

             be at least 6F higher than entering water temp.




I checked my temps - the entering water temp is 44 degrees, and the coil leaving temp is 55. I have a 5 degree delta T on the fan - could that be causing this?

Vikram Sami
BEMP, LEED BD+C
Associate Partner



ZGF ARCHITECTS LLP
T 206.521.3509 E vikram.sami at zgf.com<mailto:vikram.sami at zgf.com>
925 Fourth Avenue, Suite 2400
Seattle, WA 98104





________________________________
The contents of this email and any attachments to it contain confidential and/or legally privileged information from Zimmer Gunsul Frasca Architects LLP or its affiliates. If you are not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, be aware that any disclosure, copying, distribution, or use of the information contained herein is strictly prohibited. If you received this transmission in error, please contact the sender and destroy the material in its entirety, whether in electronic or hard copy format.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20131107/761489ec/attachment-0002.htm>


More information about the Equest-users mailing list