Re: [EnergyPlus_Support] Re: Error -- Mass Flow Rate Calculation ........

[Sankar <sankar.padhmanabhan@xxxxxxxxxxx>]

Andrea,
Firstly I noticed that the way you set up the loop is not exactly the 
same as the Solar flat plate collector. Since you are using a 
Tempering valve in the Radiant loop to control the tank temperature, 
the water heater should be specified "PASSIVE". That would get rid of 
all the "Outlet and inlet differ by more than tolerance" error.
However, even with that change you will end up with another mass flow 
warning (out of bounds), which is not going to affect the results 
significantly. The warnings, I think, are due to a minor update 
problem (of Max Avail, read engineering Doc for more info on Mass 
flow max avail) which manifested in your input file. I have asked the 
person who developed the valve model for more details and if a bug 
really exists a CR would be posted to take care of that.

Thanks
Sankar

At 07:53 PM 10/14/2006, Sankar wrote:

>Andrea,
>Could you upload the file to the yahoo groups folder or send it to me
>at <mailto:sankar.padhmanabhan%40okstate.edu>sankar.padhmanabhan@xxxxxxxxxxx
>
>Thanks
>Sankar
>
>At 06:02 PM 10/14/2006, you wrote:
>
> >Hi, I'm using the new E+ 1.4 now and I set all water loops flow rates
> >to autosize, still I get :
> >
> >Warning ** Error -- Mass Flow Rate Calculation in Plant Loop=SECOND
> >LOOP, Outlet and Inlet differ by more than tolerance.
> >** ~~~ ** Occurrence info=TRIESTE, 01/21 00:00 - 01:00
> >** ~~~ ** Loop inlet node=SECOND LOOP PUMP INLET,
> >flowrate=0.2087 m/s
> >** ~~~ ** Loop outlet node=OUTLET SECOND BOILER,
> >flowrate=0.4173 m/s
> >
> >My idf is very similar to the SolarCollectorFlatPlateWater example
> >file, but instead of heating domestic water my system feed a radiant
> >floor. I have the problem on the radiant floor loop.
> >
> >Any idea ?
> >Thanks.
> >Andrea.
> >
> >--- In
> ><mailto:EnergyPlus_Support%40yahoogroups.com><mailto:EnergyPlus_Sup 
> port%40yahoogroups.com>EnergyPlus_Support@xxxxxxxxxxxxxxx,
> >"ingdallolio"
> ><ing.dallolio@...> wrote:
> > >
> > > Hello,
> > >
> > > I Uploaded the file tempering valve_60m2,
> > > before I added the tempering valve this file did only give few
> >warnig
> > > (clear origin) , now I get 174 times :
> > > Error -- Mass Flow Rate Calculation in Plant Loop=SECOND LOOP,
> >Outlet
> > > and Inlet differ by more than tolerance.
> > > Any idea about this ?
> > > Thanks for reading this.
> > > Andrea
> > >
> >
> >
>
>[Non-text portions of this message have been removed]
>
>


[Non-text portions of this message have been removed]



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