[Equest-users] eQuest Workaround for Water Economizers

[Steven Savich]

Kathiresan,

 

I don't think you can do a parametric run of a water economizer chiller in the way you describe.  As I noted in my response to Tom a couple years ago, you'll need to define a *separate* water economizer chiller, condenser loop, and cooling tower *in addition to* the other chiller(s), loop(s), and cooling tower(s).  This will probably be more successful if you generate a separate model to compare to your baseline rather than attempt it as a parametric run.  Have a look at the equest/DOE new features manual at the section on “water economizer chillers”.

 

If you continue to run into problems, I recommend posting your .inp and .pd2 files to the equest users list.  For any given modeling problem, odds are there's at least one person on the list who's worked out a defensible/sensible method of handling the problem.

 

Good luck,

Steven

 

 

From: Kathiresan.Rajagopal at jci.com [mailto:Kathiresan.Rajagopal at jci.com] On Behalf Of cic at jci.com
Sent: Monday, November 21, 2011 5:10 AM
To: Steven Savich
Subject: Re: [Equest-users] eQuest Workaround for Water Economizers

 


Dear Steve, 

I am trying to do parametric run for water economizer chiller just by changing water economizer from elect cent chiller. But it seems i am not getting any result. It seems i am missing lot of inputs. 
Can you please put some important points needs to be taken care when modeling water economizer.? 

Thanks for your advice 

regards 
Kathiresan 




From: 

"Steven Savich" <ssavich at systemswestengineers.com> 


To: 

<Tom at NorthernArchitects.com> 


Cc: 

equest-users at lists.onebuilding.org 


Date: 

09/18/2009 09:44 PM 


Subject: 

Re: [Equest-users] eQuest Workaround for Water Economizers

 

  _____  




Tom, 
  
In the equest/DOE new features manual, there’s a section on “water economizer chillers” 
  
Basically, to run a cooling tower in water economizer mode, you have to define a (virtual) water economizer chiller and attach a cooling tower & condenser water loop to it.  You’ll need to set up the water econ chiller, water econ condenser loop, and water econ cooling tower as  *completely* separate entities from any other chillers & cooling towers that you run and have them attached to the primary chilled water loop in parallel with the other chillers. 
  
You also may need to use schedules, equipment controls, and load management of the chillers and circulation loops depending on your exact plant configuration. 
  
For the water econ info, look under help/DOE2 help/Volume 6: New Features/Chiller Water Economizer 
  
Hope this helps, 
Steven 
  
Steven Savich, LEED AP 
Systems West Engineers 
411 High Street 
Eugene, OR  97401-2427 
(541) 342-7210 
(541) 342-7220 (fax) 

 

  _____  


From: Tom O'Brien [ <mailto:Tom at NorthernArchitects.com> mailto:Tom at NorthernArchitects.com] 
Sent: Friday, September 18, 2009 7:56 AM
To: ssavich at systemswestengineers.com
Subject: eQuest Workaround for Water Economizers 
  
Steve - 
  
I read your eQuest post today today regarding your campus chilled water system / local cooling tower question.  I'm afraid I don't have a suggestion as I've not progressed that far with eQuest. 
  
However, you noted that "I’m familiar with the equest workaround for water economizers".  We've been stumped by this in trying to set up a cooling tower / chiller combination that lets the cooling tower act as a precooler for the air-cooled chillers and/or as the cooling source when the building needs cooling in the winter months (our winter months are plenty cold enough to handle the relatively low cooling needs we have with a cooling tower without running the chillers).  eQuest doesn't seem to have a way to allow us to connect both the chillers and the cooling tower to the chilled water piping.  The typical eQuest cooling tower seems to want to connect to the condenser water off the chillers and assumes the chillers are water-cooled. 
  
Can you point me in the right direction to find the find the workaround you mentioned? 
  
Many Thanks. 
  
Tom 


Tom O'Brien
Northern Architects, Inc.
207 King Street Suite 3
Burlington, VT 05401
T: 802-658-1953
F: 802-658-2975
E: Tom at NorthernArchitects.com_______________________________________________
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