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[EnergyPlus_Support] other questions about plant-loop and condenser -loop.



Hi Mike,

Thank you very much!you are so kind!

1.I want to see the optimum control of plant loop.so i set 2 branches 
with branch-pumps.and i set the bypass branches both in supply side 
and demand side.but there are always warnings:

 ** Warning ** Error -- Mass Flow Rate Calculation in Plant Loop=HW-1-
LOOP, Outlet and Inlet differ by more than tolerance.
   **   ~~~   **  Occurrence info=WINTER-DESIGN-DAY, 01/21 08:00 - 
09:00
   **   ~~~   ** Loop inlet node=HW-1-SS-IN-PIPE-IN-ND, 
flowrate=8.0905 m/s
   **   ~~~   ** Loop outlet node=HW-1-SS-OUT-PIPE-OUT-ND, 
flowrate=16.1811 m/s

What should i do?

2.it's not convenient for condenser-loop only could be set a circle-
pump per loop.so for two chillers,one condenser-pump is not 
physical,and just one pump is not energy-save.
how to solve that problem? set two condenser-loops for different 
chillers?



Well Kong



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@...> wrote:
>
> It is difficult to say for sure without seeing the input file.  
This type of 
> error usually occurs when the loop is unable to conserve mass flow 
around the 
> loop.  Check the flow rates specified for the cooling tower(s) and 
the 
> condenser loop pump and in the condenser loop object.  Check if 
there is a 
> bypass.  Check the pump controls.  Check the ACTIVE/PASSIVE 
settings on the 
> branches.  See ExampleFiles\CoolingTower.idf for an example.
> 
> Mike
> 
> 
> On 25 Sep 2006 at 5:25, well_kong wrote:
> 
> > I simulated whole IDF file.and it's warning so many times!
> > I really can't resolve it.
> > Why the minimum mass flow is greater than the maximum?
> > 
> >  ** Warning ** COOLING TOWER:SINGLE SPEED- "CT-SS-TOWER-1":
> >    **   ~~~   **  Condenser Minimum Loop Mass Flow is greater 
than 
> > Condenser Maximum Loop Mass Flow
> >    **   ~~~   **  Minimum Loop Mass Flow has been reset to 
Maximum Loop 
> > Mass Flow
> > 
> > 
> > 
> > 
> > 
> > 
> > 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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