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RE: [EnergyPlus_Support] Re: Cntroller input data problem.
Okay, here are some things to check out. My experience with this error
is that it is usually problem in the condenser plant loop serving the
chiller. Report out some node temperatures and flow rates in the
condenser plant loop as well as the chilled water loop and see if the
chiller and cooling tower are working. The sensed temperature of
22,288C in the message below is a clue that chiller isn't working. Often
it is that some component or system is inadvertently scheduled off.
Sometimes it is a subtle issue of "Active" or "Passive" settings on
branches in the condenser loop causing flow to inadvertently bypass
around a component.
It is possible to get this error when the incoming outside air is very
cold and the building needs little or no cooling. Putting the heating
coil in front of the cooling coil is important in this situation (a real
chilled water coil could freeze!).
If this error is only happening occasionally during an annual
simulation, it is probably safe to ignore. We all love it when models
issue no scary warning messages. But in my opinion, one has to lower
their level of expectation and be prepared to live with warnings and
even severe error messages. While it is a good goal, you'll go crazy
trying to eliminate every error in every model. On big models, I am
often forced to live with hundreds of warnings and tens of severe
errors. The really important errors will be fatal and the program will
stop.
Hope this helps.
________________________________
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of tjutw
Sent: Friday, August 03, 2007 3:34 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Cntroller input data problem.
Hi,
Thank you for your advice.
I have changed the sequence of heating coil and cooling coil. But I
still got the same wrong message.
By the way, the file is expanded by COMPACT HVAC.
Could anyone help me solve this problem? Thank you in advance.
Tj Ywh
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx
<mailto:EnergyPlus_Support%40yahoogroups.com> , "berlinclownfish"
<SPlamp@...> wrote:
>
> I've experienced the identical problem. The error relates to the
> arrangement of the AHU cooling coil installed prior the AHU heating
> coil.
>
> However, the arrangement in the AHU that I'm trying to model in fact
> has a reversed setup. This also means the reverse arrangement of each
> coil's controller in the class 'Air Distribution' under the
> tab 'CONTROLLER LIST' to comply with the simulation order.
>
> In addition, when manually changing (I presume both of you created
> your input files with the help of a graphical interface) the order of
> both coils, you'll also have to change the inlet and outlet nodes on
> the remaining equipment (e.g. return fan, supply fan, etc.).
>
> Regards,
>
> Sandro
>
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
<mailto:EnergyPlus_Support%40yahoogroups.com> , "tjutw" <tjutw@> wrote:
> >
> > Hi Everyone,
> >
> > I also have the same problem.
> >
> > ** Severe ** FindRootSimpleController: Controller error for
> > controller = VAV SYS 2 COOLING COIL CONTROLLER
> > ** ~~~ ** Occurrence info=CALGARY INT'L AB CAN WYEC2-B-25110
> > WMO#=718770, 01/31 09:00 - 10:00
> > ** ~~~ ** Controller function is inconsistent with user
> > specified controller action = Reverse action
> > ** ~~~ ** Actuator will be set to maximum action
> > ** ~~~ ** Controller control type=Temperature
> > ** ~~~ ** Controller temperature set point = 17.20 [C]
> > ** ~~~ ** Controller sensed temperature = 17.37 [C]
> > ** ~~~ ** Controller actuator mass flow rate set to 5.71
> [kg/s]
> > ** ~~~ ** Controller actuator temperature = 7.00 [C]
> > ** ~~~ ** Note: Chilled water coils should be reverse
> action
> > and the entering chilled
> > ** ~~~ ** water temperature (controller actuator
> > temperature) should be below the setpoint temperature
> > ** ~~~ ** Note: Hot water coils should be normal action and
> > the entering hot
> > ** ~~~ ** water temperature (controller actuator
> > temperature) should be above the setpoint temperature
> >
> >
> > I am also sure that the parameters for VAV SYS 2 COOLING COIL
> > CONTROLLER are right, because most of time the program can run
> > properly. It seem many factors can affect this error message. For
> > example, if I add more internal heat in rooms, then this error
> > message will not appear. I found this just because I input the
> wrong
> > values for internal heat.
> >
> > Tj Ywh
> >
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
<mailto:EnergyPlus_Support%40yahoogroups.com> , "love9787m" <love9787m@>
> > wrote:
> > >
> > > ** Severe ** FindRootSimpleController: Controller error for
> > > controller = MAIN COOLING COIL CONTROLLER
> > > In the error message, Controller sensed temperature is 22288.16
> [C].
> > > I've never seen before like this problem and sensed temperature
> > > never reached this high temperature.
> > > To find out the method, which part or object should I sheckand
> > > what is the reason for this problem?
> > >
> > > ** ~~~ ** Occurrence info=ULSAN - KOR IWEC DATA
> WMO#=471520,
> > > 07/03 05:40 - 05:41
> > > ** ~~~ ** Controller function is inconsistent with user
> > > specified controller action = Reverse action
> > > ** ~~~ ** Actuator will be set to maximum action
> > > ** ~~~ ** Controller control type=Temperature
> > > ** ~~~ ** Controller temperature set point = 15.00 [C]
> > > ** ~~~ ** Controller sensed temperature = 22288.16 [C]
> > > ** ~~~ ** Controller actuator mass flow rate set to 1.10
> > > [kg/s]
> > > ** ~~~ ** Controller actuator temperature = -120.36 [C]
> > > ** ~~~ ** Note: Chilled water coils should be reverse
> > > action and the entering chilled
> > > ** ~~~ ** water temperature (controller actuator
> > > temperature) should be below the setpoint temperature
> > > ** ~~~ ** Note: Hot water coils should be normal action
> and
> > > the entering hot
> > > ** ~~~ ** water temperature (controller actuator
> > > temperature) should be above the setpoint temperature
> > > ** Warning ** Calculated Humidity Ratio Invalid
> (PsyWFnTdbTwbPb)
> > >
> > > Please let me know the reason and method.
> > > Thank you in advance.
> > >
> >
>
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