[TRNSYS-users] Fatal error with sub-hourly timesteps - simulation timestep and the radiation calculation

[David BRADLEY via TRNSYS-users]

Michael,

   Type15 assumes that the data being read is in 1hour increments. If 
you are using data that has a smaller step then you'd need to read it 
using Type9, even if it is in one of the data formats that can be read 
by Type15. Once read by Type9 the radiation data is then processed by 
Type16.

kind regards,

  David



On 11/22/2016 08:47, Michael Brown via TRNSYS-users wrote:
> Hello TRNSYS users,
>
> I am testing a sub-hourly (10-min data) .epw weather file created with 
> the EnergyPlus weather converter utility using measured data, read 
> into a simple PV model in TRNSYS by Type 15. It seems to work fine 
> until about halfway through the simulation when it crashes with a 
> fatal error:
>
> "The simulation timestep is greater than the data timestep for the 
> radiation calculation. The simulation timestep needs to be reduced."
>
> Reviewing the .epw file there is nothing unusual at this or nearby 
> timesteps, except that it is a period of 24-hour sunlight. But, the 
> simulation does not fail when this phenomena is first encountered.
>
> I note a similar problem on the message board:
>
> http://onebuilding.org/archive/trnsys-users-onebuilding.org/2012-November/024289.html 
> <http://onebuilding.org/archive/trnsys-users-onebuilding.org/2012-November/024289.html>
>
> Any guidance would be greatly appreciated.
>
> Regards,
> Michael Brown
> Carleton University, Ottawa, Canada
>
>
>
>
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> TRNSYS-users at lists.onebuilding.org
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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