Not able to model 13 chillers under one circulation-loop chilled water loop

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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.

Regards,
Nitin J Harjai

Nitin Harjai's picture
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Joined: 2015-09-23
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Yes. I believe 10 is the limit. I have hit that before on a Hot Water Loop with Boilers before.

Thanks,
DARIC R ADAIR PE, CEM, BEMP
Mechanical Engineer, Energy Analyst

Henderson Engineers
daric.adair at hendersonengineers.com

Licensed in KS

Daric Adair's picture
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Joined: 2017-10-21
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Nitin,

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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David Griffin II's picture
Joined: 2015-01-03
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The BDLKEY.OUT file states the maximum chillers is 30.

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

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Jones, Christopher2's picture
Joined: 2017-10-12
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?.but only 10 per loop, you would need to add at least three CHW loops to model 30 chillers.

Wolfe, Josh's picture
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