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[EnergyPlus_Support] Re: Inlet parameters for plant demand side splitter are not physically possible
Mike,i've checked the inputs for "cooling design supply air humidity
ratio",i try to set the zone value as smaller and smaller(0.001),but
the warnings also exit.How to set the humidity ratio in zone sizing
and system sizing?In message 5514,you said that "These values have a
very small impact on coil sizing. The default values can be used for
most applications." I'm puzzled.
I've upload a zip folder named "Hotel.zip".Appreciated your kind help
to eliminate these warnings.
Thanks very much.
pch
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
<mjwitte@g...> wrote:
>
> > ** Warning ** SizeWaterCoil: Coil="1F_2_FPIU_CW_COIL", Cooling
Coil
> > has leaving humidity ratio > entering humidity ratio.
> >
>
> For the above warning, check the inputs for "cooling design supply
air humidity
> ratio" in ZONE SIZING and SYSTEM SIZING objects. If the zone value
is too
> high, this error can occur.
>
> For the itereation limit warning on the hot water coil, you can
ignore these if
> there are only two in a full simulation. I cannot say for sure how
to
> eliminate it unless I see the input file. Please zip and send to
energyplus-
> support@g...
>
> Mike
>
>
> On 3 Nov 2005, at 16:48, hbn_pch wrote:
>
> > 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
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> > > >
> > > > EnergyPlus Documentation is searchable. Open
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> > and press the
> > > > "search" button.
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > > ========================================================
> > > Michael J. Witte, GARD Analytics, Inc.
> > > EnergyPlus Testing and Support
> > > EnergyPlus-Support@g...
> > >
> >
> >
> >
> >
> >
> >
> >
> > 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
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> > EnergyPlus Documentation is searchable. Open EPlusMainMenu.idf
and press the
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> >
> > Yahoo! Groups Links
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>
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support
> EnergyPlus-Support@g...
>
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