Re: [TRNSYS-users] Discrete or non-discrete time step

[Jeff Thornton <thornton@tess-inc.com>]

Christopher,

TRNSYS will convert your timestep into the closest 1/N timestep where N is an integer and the timestep is in hours.  In that way, there is always a constant number of timesteps per hour - making life a lot easier for people coding their own models.  The largest value of N is currently coded to 36000; for a minimum timestep of 0.1 seconds.

Jeff 

Sent from my iPhone

On Feb 11, 2022, at 9:29 AM, Graf, Christopher via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:



Dear Trnsys users,

 

as part of my research I simulated a building with domestic hot water (DHW) and space heating system for one year. My current time step is 3min (0.05hr). I’m thinking about lowering the time step to improve the resolution of my DHW tapping profiles and the simulation results.

 

I wondered if I can basically take any time step? For example if I choose to take 5s (0.13 or rounded 0.13888889) it technically adds up to 8760 hr, but in reality the time steps needs to rounded after a certain number of decimals, true? Will the time step be rounded in TRNSYS? And if yes, how does TRNSYS cope with a time step which does not exactly add up to 8760 hr? Does it make a difference whether I chose to “min” or “s” instead of “hr” during the configuration of the time step in the settings menu?

 

Therefore, would it be best or is it necessary to choose a time steps which is discrete and adds up to 8760 hr?

 

Thank you for your answers!

 

Best Regards,

Christopher Graf

 

Christopher Graf, M.Sc.

Scientific Associate, PhD-Candidate

 

Thermal Energy System Departement, Energy Economics and Process Integration Division

Fraunhofer Institute for Energy Economics and Energy System Technology

 

Gottschalkstr. 28a | 34127 Kassel | Germany (Visiting adress)

Königstor 59 | 34119 Kassel |Germany (Postal adress)

 

christopher.graf@iee.fraunhofer.de | Phone +49 561 804-2692

 

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