[EnergyPlus_Support] Re: Inlet parameters for plant demand side splitter are not physically possible

["hbn_pch" <hbn_pch@xxxxxxxxxxxx>]

Mike,thanks for your response.I check the eio ouput file and find 
that some zones peak heating or cooling load are zero.I don't know 
why they are sized to zero.

In order to eliminate the serve,i changed them to the uncontrolled 
zone,and really the serve is eliminated.But the warnings exist as 
described before.e.g:
  
 ** Warning ** SizeWaterCoil: Coil="1F_2_FPIU_CW_COIL", Cooling Coil 
has leaving humidity ratio > entering humidity ratio.
   **   ~~~   ** ..will be sized for 50% of design entering humidity 
ratio.  

Because there are too many zone in the model.I have to expand some 
objects in the idd.For convenience,i just upload the eio and the err 
file.Can you check the two files and give me some suggestion?

  thanks in advance.
  pch

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@g...> wrote:
>
> 1.  Check the zone peak heating and cooling loads and component 
sizes reported 
> in the eio output file.  Are these reasonable?  Are any of the 
coils being 
> sized to zero max water flow rate?
> 
> 2.  The splitter errors usually indicate that a BYPASS is missing 
or the pump 
> controls are invalid.  The error message means the pump is trying 
to push more 
> flow into the splitter than the leaving branches can take.  This 
can occur if a 
> constant flow pump is used without a bypass.
> 
> 3.  The convection algorithms just change the zone load slightly, 
so they are 
> not really related to these problems.
> 
> Mike
> 
> 
> On 1 Nov 2005, at 16:33, hbn_pch wrote:
> 
> > I found when i input the inside convection algorithm and outside 
> > convection algorithm as simple,then the sever as description will 
> > present.If i input as detailed instead,then the severe will 
> > disappear,but there are much more warnings as follows:
> > 
> >     ** Warning ** Hot water coil control failed in 4 pipe 
induction 
> > unit 2F_10_FPIU
> >    **   ~~~   **   Iteration limit exceeded in calculating hot 
water 
> > mass flow rate
> > 
> >    ** Warning ** Hot water coil control failed in 4 pipe 
induction 
> > unit 2F_22_FPIU
> >    **   ~~~   **   Iteration limit exceeded in calculating hot 
water 
> > mass flow rate
> > 
> >   Apprecriated your kind help.thank you very much
> > 
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "hbn_pch" 
<hbn_pch@y...> 
> > wrote:
> > >
> > > Hi,all
> > >    There is a serve and some warnings that i can't fix.As 
follows:
> > > 
> > >    ** Severe  ** Inlet parameters for plant demand side 
splitter 
> > > are   not physically possible
> > >    **   ~~~   ** Problem in input for plant demand side CHILLED 
> > WATER 
> > > LOOP
> > >    **   ~~~   ** The maximum flow out of the splitter is less 
than 
> > > the minimum inlet flow
> > >    **   ~~~   ** Flow rate inputs for the loop do not match 
flow 
> > > requirements of the various branches/components
> > >    **   ~~~   ** Check your flow rates and make sure that flow 
> > > balances between the splitter inlet and outlets
> > > 
> > >    ** Warning ** SizeWaterCoil: Coil="1F_9_FPIU_CW_COIL", 
Cooling 
> > > Coil has leaving humidity ratio > entering humidity ratio.
> > >    **   ~~~   ** ..will be sized for 50% of design entering 
> > humidity 
> > > ratio.
> > >    ** Warning ** For COIL:Water:Cooling 1F_9_FPIU_CW_COIL
> > >    **   ~~~   ** CalcCoilUAbyEffectNTU:Given Q impossible for 
given 
> > > inlet states,Proceeding With MaxHeat Transfer
> > > 
> > >   I check the splitter and find no problems.Meanwhile,flow 
rates 
> > are 
> > > all autosized.I don't know how to eliminate the serve.
> > > 
> > >   Many zones have the warning above.I don't know what do they 
mean.
> > > 
> > >   Can anybody give me some suggestion? thanks 
> > > 
> > >  pch
> > >
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 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@g...
>






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