Re: [EnergyPlus_Support] Condenser Loop Flow Rate

["Michael J. Witte" <mjwitte@xxxxxxxx>]

My apologies for the delayed response.  I believe the problem lies with having 
a single cooling tower on the condenser loop.  Once the tower is active, it is 
request it's full flow rate.  

Try making the tower a PASSIVE component on its branch.  I am not 100% sure if 
this will change anything, or it may not work at all.  (Sorry, I can't take 
time today to try this out.)

If that does not work, then you will need to model multiple cooling towers in 
parallel.  With load controls corresponding to the chiller load controls, then 
the towers should come on in sequence as the chillers do, and the condenser 
loop flow rate should follow.

If these don't work, please upload your input file.

Mike


On 1 Apr 2006 at 4:31, enerdata wrote:

> I have three variable flow chillers and a bypass branch in parallel 
> between the condenser demand side splitter and mixer, staged with 
> cooling load range based operation.  On the supply side, I have a 
> single variable speed intermittent condenser water pump and single 2 
> speed cooling tower on the supply side with a bypass in parallel.
> 
> The problem is that the cooling tower and pump operate at 100% design 
> flow (therefore high energy usage) as though all three chillers were 
> operating, even when only one chiller operates.
> 
> I have tried removing the bypass branch on the demand side but his 
> generates an error.  What is the correct arrangement of bypass branches 
> to simulate the cooling tower and condenser pump flow varying as the 
> chillers are switched on and off (to model an arrangement where each 
> chiller has it's own condenser water pump)?
> 
> Many thanks for your assistance.
> 
> 
> 
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press the
> "search" button.
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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