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

[David BRADLEY via TRNSYS-users <trnsys-users@lists.onebuilding.org>]

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

Any guidance would be greatly appreciated.

Regards,

Michael Brown

Carleton University, Ottawa, Canada

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