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Re: [EnergyPlus_Support] warnings about "temperatuer out of range"
>From the error message, you know that the problem lies with "VAV SYS 4". Check
for misconnections, bad controls (incorrect set point or control nodes),
undersized capacities, or battling coils.
Mike
On 17 Apr 2007 at 2:57, Zhen Tian wrote:
> Thank you Mike. I changed to Coil:water:Cooling and these warning are gone.
> However, when I change some of the zoning arrangement. I got another type of
> warings ** SolveAirLoopControllers: Maximum iterations (50) exceeded for VAV
> SYS 4, at SHENZHEN - CHN TMY3-594930 WMO#=594930, 07/07 08:00 - 08:02
>
> Could you please or other experienced fellow tell what issues cause these
> warings and what can be done to solve this problem?
>
> Thank you very much in advance.
>
> Regards,
>
> David
>
>
> "Michael J. Witte" <mjwitte@xxxxxxxx> wrote:
> These types of errors almost always come from initial iterations in
> the
> detailed cooling coil model which result in calling a Pyschrometric function
> with an impossible humidity condition. There is not actually a temperature of
> 35286.37 occuring within the simulation.
>
> Currently Compact HVAC uses COIL:Water:DetailedFlatCooling to model chilled
> water coils. For certain types of applications, this model generates such
> warnings. Since these warnings usually result during early iterations within the
> coil model, they typically do not impact the results, but I cannot say that with
> certainty for all cases.
>
> To eliminate these warnings, try editing the expidf file (saved under a new
> name.idf) and replace the COIL:Water:DetailedFlatCooling objects (and all
> occurences of COIL:Water:DetailedFlatCooling) with COIL:Water:Cooling. Future
> versions of Compact HVAC will allow the user to select the specific chilled
> water coil model to be used.
>
> Mike
>
> On 12 Apr 2007 at 18:48, Zhen Tian wrote:
>
> > Dear all,
> >
> > I am simulating base case design for an office building located in ShenZhen
> > (ASHRAE Zone 2A) and experiened the following warnings:
> >
> > The system is VAV reheat and all system components are autosized and generated
> > with Compact HVAC object.
> >
> > Could someone tell me that whether these warnings will affect my simulation
> > results? What inputs cause these warnings and how can I fix these warnings?
> >
> > Thank you very much in advance.
> >
> > Regards,
> >
> > David
> >
> > ** Warning ** Temperature out of range [-100. to 200.] (PsyPsatFnTemp)
> > ** ~~~ ** Occurrence info=SHENZHEN - CHN TMY3-594930 WMO#=594930, 01/02
> > 00:45 - 01:00 ** ~~~ ** Input Temperature=35286.37 ** Warning **
> > Temperature out of range [-100. to 200.] (PsyPsatFnTemp) ** ~~~ **
> > Occurrence info=SHENZHEN - CHN TMY3-594930 WMO#=594930, 01/02 01:00 - 01:15 **
> > ~~~ ** Input Temperature=102750.91 ........
> >
> >
> >
> >
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> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support
> EnergyPlus-Support@xxxxxxxx
>
>
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>
> Attachments are not allowed -- please post any files to the appropriate folder
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> Yahoo! Groups Links
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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