Re: [EnergyPlus_Support] EnergyPlus/COMIS error: MATRIX SINGULAR FORZONE #2

[Frederick Winkelmann <FCWinkelmann@xxxxxxx>]

Joe,

Did add a MIN value to air mass flow coef on Energy+.idd?

Fred W.

Joe Huang wrote:

> Ming,
>
> I have repeated your steps with the example file and found that this error
> (MATRIX SINGULAR FOR ZONE #2) was occuring due to your third change where
> you reduced the Air Mass Flow Coefficient from 0.001 to 0.0001.  The problem
> is caused by the intermediate COMIS input file (eplusout.cif) not being
> written to the sufficient level of precision, so that the input 0.0001
> appeared as 0.000, i.e., interpeted as a flow coefficient of 0.  I solved
> the problem by increasing the precision for writing the flow coefficient and
> exponents from three decimal points (F10.3) to five decimal points (F10.5).
> I will upload that fix to the EnergyPlus server on Monday.  Until the
> correction makes it into the compiled code on the server, please keep the
> flow coefficients and exponent at above 0.001.  Even after the fix is
> implemented, you need to keep them at above 0.00001.
>
> Joe
> ----- Original Message -----
> From: "waspoorboy" <mingsbox@xxxxxxxxxxxxxx>
> To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
> Sent: Tuesday, December 09, 2003 11:20 AM
> Subject: [EnergyPlus_Support] EnergyPlus/COMIS error: MATRIX SINGULAR FOR
> ZONE #2
>
> > To reproduce this problem,
> > I took example file 3zvent.idf
> > #1: Delete all cracks. [only two window and one door left]
> > #2: Remove East_Zone from COMIS ZONE DATA
> > #3: Change the Air Mass Flow Coeff from 0.001 to 0.0001
> > #4: Execute EnergyPlus and Fatal error will be there.
> >
> > COMIS AIR FLOW:OPENING,
> > WiOpen1,  !- Name
> > 0.001,  !- Air Mass Flow Coefficient When Window or Door Is Closed
> > 0.667,  !- Air Mass Flow Exponent When Window or Door Is Closed
> >
> > Is this problem solvable ?
> > Thanks,
> > Ming
> >
> >
> >
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