[EnergyPlus_Support] Re: LowTemperatureRadiant: Error "Temperature out of range" ?

["aschzh" <aizh@xxxxxx>]

Dear Jason,

thank you very much for the tips. I drastically reduced the loads and the temperatures seemed more plausible / less error messages occured. However, as the building actually encounters these loads I have to find a way for the radiant system to cope with them. I tried smaller timesteps and smaller convergence values as you proposed but this did not have any effect.

Do you know how which parameters to change to make a radiant system more powerful? I found some posts about matching flow rates of system and plant loop, do you have any experience on that?

Thanks and kind regards,

Arno 


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Jason Kirkpatrick <jason.alan.kirkpatrick@...> wrote:
>
> Arno,
> 
> I would suggest a troubleshooting run with no infiltration and reduced loads
> in order to identify if the system is in fact just incapable of handling the
> loads you have placed on it.
> 
> I have encountered a similar type of error with radiant systems (surface
> temperatures out of bounds) and my error was not related to the loads on the
> system. My errors were solved by tightening up my convergence values and
> reducing the length of the time steps. Also updating to version 6 of
> EnergyPlus implements improved controls for radiant systems.
> 
> Best of luck,
> 
> Jason
> 
> 
> 
> On Fri, Jun 17, 2011 at 7:09 AM, aschzh <aizh@...> wrote:
> 
> > **
> >
> >
> > Dear Community,
> >
> > i keep getting an error message (see below) in my
> > GHE-GSHP-LowTemperatureRadiant:ConstantFlow setup. The glycol temp (water)
> > seems to get to high / to low. My assumption is that the low temperature
> > radiant system is not powerful enough to deliver the required loads that
> > occur in the zone. But what to I have to change?
> >
> > Thanks for any hints,
> >
> > Arno
> >
> > ** Warning ** GetSpecificHeatGlycol: Temperature is out of range (too low)
> > for glycol specific heat **
> > ** ~~~ ** ..Called From:UpdateLowTempRadiantSystem
> > Glycol=WATER,Temperature=-1.51
> > ** ~~~ ** Environment=Zuerich-SMA - - TMY2-66600 WMO#=, at Simulation
> > time=03/13 08:17 - 08:20
> > ** Warning ** GetSpecificHeatGlycol: Temperature is out of range (too high)
> > for glycol specific heat **
> > ** ~~~ ** ..Called From:UpdateLowTempRadiantSystem
> > Glycol=WATER,Temperature=125.01
> > ** ~~~ ** Environment=Zuerich-SMA - - TMY2-66600 WMO#=, at Simulation
> > time=07/18 03:00 - 03:10
> >
> >  
> >
>




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