[Equest-users] Not able to model 13 chillers under one circulation-loop chilled water loop

Wolfe, Josh josh.wolfe at tlc-eng.com
Fri Jun 15 06:16:50 PDT 2018

….but only 10 per loop, you would need to add at least three CHW loops to model 30 chillers.

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jones, Christopher via Equest-users
Sent: Friday, June 15, 2018 9:12 AM
To: David Griffin II <DGriffin at archnexus.com>; Nitin Harjai <nitin.harjai28 at gmail.com>
Cc: equest-users at onebuilding.org
Subject: Re: [Equest-users] Not able to model 13 chillers under one circulation-loop chilled water loop

The BDLKEY.OUT file states the maximum chillers is 30.

Christopher R Jones, P.Eng.
T+ 1 416-644-0252

[cid:image001.png at 01D40489.96BA4F10]

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of David Griffin II via Equest-users
Sent: Wednesday, June 13, 2018 4:24 PM
To: Nitin Harjai <nitin.harjai28 at gmail.com<mailto:nitin.harjai28 at gmail.com>>; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Not able to model 13 chillers under one circulation-loop chilled water loop


I have not run into this issue in the past. However, the error message suggests there is a limit to the number of chillers and/or other equipment that can be attached to any given circulation loop. That aside, I have an idea I wanted to share with you that may or may not fix your error issues.

Most loops are setup in an N+1 fashion; i.e. there is an extra piece of equipment installed on the loop incase a failure occurs. That way the process being served by the loop doesn’t lose it’s ability to serve it’s funciton when one of the chillers fails. If this is the case for your project, simply reduce the number of chillers on your loop to 10 (the maximum pieces of primary equipment per loop) and your model should run.

I hope this helps!

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From: Nitin Harjai [mailto:nitin.harjai28 at gmail.com]
Sent: Wednesday, June 13, 2018 10:00 AM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Not able to model 13 chillers under one circulation-loop chilled water loop

Hello all,

I am facing problem when I try to model 13  chillers in water side HVAC and getting error while performing simulation.

I am getting error "For Circulation-Loop Chilled Water Loop. Maximum of ten attached primary  equipment units was exceeded."

Can anybody tell me that is there any limitation issues considering the chiller quantity in equest.

Please help me.

Nitin J Harjai


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