[Bldg-sim] Two Questions for the esteemed members of this fine list

Joe Huang yjhuang at whiteboxtechnologies.com
Sat Sep 20 13:09:33 PDT 2014

Unless I'm missing something here, this seems like a very 
straightforward modeling problem.  I'm curious why you think that eQUEST 
or DOE-2 can't handle it.  There are plenty of chiller performance 
curves, and you could also create your own if you have data on the 
chiller characteristics.

On 9/20/2014 12:25 PM, RobertWichert wrote:
> I am working on modeling a small computer room.  The computers are the 
> major load.  The space is served by a small water cooled chiller and 
> an air handler, with economizer.  The questions are:
> 1)  Does EnergyPlus lend itself to such models, and are there specific 
> tools that might be useful?  I am interested in accurately modeling 
> the computer with varying loads over the year, and with the economizer 
> enabled to show the difference in various supply air temperatures and 
> cooling tower strategies (multiple versus one cooling tower, variable 
> versus multiple fans) as well as various economizer strategies (return 
> air versus supply air control and the resulting chiller loading).  I 
> am also interested in detailed chiller modeling, as the load varies 
> from full economizer to full chiller and the chiller part-load 
> performance is a key attribute. The chiller supply temperature will be 
> higher than typical for chilled water coil cooling, so that must be 
> flexible as well.
> 2)    Is there any specialized modeling tool that anyone knows about 
> that is especially good for such modeling?  I would instinctively say 
> EQuest is NOT good for that, but I may be mistaken.  I could make 
> EnergyPro work, but I do not believe that the cooling tower / chiller 
> interface is detailed enough using DOE.2.
> Your thoughts are appreciated.
> Cheers!

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