[TRNSYS-users] High time step

[David Bradley]

Manuel,
 I ran one of the example buildings with a time step of 2 hours and got 
basically the same result as with a 1 hour time step. So I think it is 
possible to run with a 2 hour time step but I can't really think of any 
reason why you would need to and I am not sure if you are going to get 
very good simulation results. Bear in mind that TRNSYS can only make one 
control decision per time step; if the controls decide to turn on a pump 
or a heater, those devices will then remain on for an entire time step 
(2 hours in your case) which will likely mean that your system is going 
to overheat and undercool your building quite dramatically. Usually when 
I run simulations, I run them with a 1 to 5 minute time step.
Kind regards,
 David


Manuel Dalle Nogare wrote:
>
> Thank you Adrian and David for your answers. But maybe I wasn't able 
> to properly explain my problem.
>
> Is there a way to increase time step higher than a hour in building 
> simulation?
>
> 1.       I run type 54 alone to produce its outputs
>
> 2.       I reduce temperature data outcomes, humidity data outcomes, 
> dew point data outcomes, last and next data read outcomes, from  1h 
> time step to 2h time step, and I summed radiation data outcomes from 
> 1h time step to 2h time step.     
>
> 3.       I set time base higher than time step
>
> 4.       I removed type 54 because it can't work with time step higher 
> than 1h
>
> 5.       I read all the data explained in 2. by type 9.
>
>  
>
> The simulation doesn't work.
>
> Is there another way to do this?
>
> Thank you
>
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>
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Thermal Energy System Specialists (TESS), LLC 
David BRADLEY                      22 N. Carroll Street - Suite 370 
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                                   USA
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