[EnergyPlus_Support] Re: Condenser Loop Flow Rate

["enerdata" <jeff.binks@xxxxxxxxxxxxxxx>]

Thanks, Mike.

Setting the tower to PASSIVE seems to give the desired result.

Regards,
Jeff

 --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@...> wrote:
>
> 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@...
>






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