Re: [TRNSYS-users] The smooth results suddenly are changed to "NaN"

[Safizadeh Mohammadreza <m.safizadeh@nus.edu.sg>]

Dear David,

Merry Christmas; and Many thanks for your prompt email.

Indeed, I could solve the problem but I am not so sure what the reason is, or it is true:

*** My rough solution (without any reason):
I ran the simulation with constant value for 9000 data, and it gives the results for all time-steps. So I guess I should increase the Decimals. I did it and increased from 4 to 7 for humidity ratio (kg/kg) and now it is working.

What do you think? Is it the solution?

Best regards :)
Reza Safi

Solar Energy Research Institute of Singapore (SERIS) National 
University of Singapore
7 Engineering Drive 1, Blk E3A #06-01, Singapore 117574 www.seris.sg


-----Original Message-----
From: David BRADLEY [mailto:d.bradley@tess-inc.com] 
Sent: 24 December, 2013 2:54 AM
To: TRNSYS users mailing list at the Solar Energy Lab, UW-Madison
Cc: Safizadeh Mohammadreza
Subject: Re: [TRNSYS-users] The smooth results suddenly are changed to "NaN"

Reza,
   NaN stands for "not a number" and it is usually the result of a model dividing by zero internally. In order to find where the NaN occurs, it is necessary to run your simulation using the line by line debugger in a fortran compiler. If you don't have a compiler and have checked your *.m code to make certain that it cannot produce a division by zero then it might be helpful to know how this NaN is being reported (is it in the lst/log files? is it reported as a FORTRAN error on screen?) in order to get a better idea of where you might look for the problem.
Kind regards,
  David


On 12/20/2013 22:06, Safizadeh Mohammadreza wrote:
> Dear all TRNYSY users,
>
> Indeed, I am using two Types155 in series, in which the results from first one are used by next one.
>
> *** Problem:
> Once I run the simulation for 9000 experimental input data, the simulation runs smoothly for 1370th data but suddenly it produces simulation results as NaN.
>
> I would appreciate if you could help me what the source of problem is. 
> :)
>
> Best Regards,
> Reza Safi
>
> Solar Energy Research Institute of Singapore (SERIS) National 
> University of Singapore
> 7 Engineering Drive 1, Blk E3A #06-01, Singapore 117574 www.seris.sg 
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users@cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users
>

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Thermal Energy Systems Specialists, LLC
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http://www.trnsys.com


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