[Equest-users] FW: FW: Dry Cooler & performance curve

[Laura Howe, RCE]

I am back to trying to figure this out and checking in to see if anyone has
any insight.  Surely I am not the only person sorting through how to model a
dry cooler?

 

Thanks

Laura

 

From: Laura Howe, RCE [mailto:laurahowe at rivercityengineer.com] 
Sent: Friday, April 10, 2015 12:47 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] FW: Dry Cooler & performance curve

 

Hi All-

 

I have a project which has a small chiller which also has a dry cooler.  The
dry cooler has only the circulation pump, then two variable speed fans which
modulate to maintain return water temp.  Initially I figured out how to add
a second chiller to the loop, and make it run only below the designated OAT
using  Equipment Controls and Load management I seem to see the savings
(using a default EIR of nearly zero for testing purposes) .  I am hopeful
that I can then create a custom performance curve for this dry cooler,
basing the energy consumption on load and OAT.  Alternately if that is too
complicated, I think OAT would be a reasonable backup plan.  

 

Does anyone have any guidance on creating such a performance curve in this
situation?

 

Thanks

Laura

 

 

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