[TRNSYS-users] Type 9 data reader

[David Bradley]

Stefan,
The first thing to check is that you specify your simulation time step, 
you do not just set the units to "minutes" and set a value of 1. The 
Studio rounds that value and writes it to the input file as a decimal 
hour equivalent and it isn't always accurate (ie you don't end up with 
exactly 15 timesteps per data file line in your case).

Instead, write the following in the simulation cards window at the 
bottom of the "control cards" (where you set the time step)

EQUATIONS 1
delt = 1/60

then select "string" for the units of your time step and set the time 
step value to "delt"

That will ensure that you have a true 1 minute timestep.

As for the other parameters of Type9, I suspect that what is happening 
is that the interpolation of your data is getting messed up due to an 
initial value problem. My solution (as clumsy and unscientific as it is) 
is to fiddle around with the initial value, instantaneous/average, and 
mode parameters until I get a Type65 plot that looks like it "should" look

Best,
David



On 7/19/2010 06:10, thiemann.stefan at vdi.de wrote:
> Hi everybody,
>
> i tried to read a data file with a 1/4 h time interval of average data
>   in a 1 min simulation. If I set "Averareous or instantenous value" to
>   "average" I got some wrong curve and the values seemed to be mirrored
>   on the x axis. Can anybody help me to better understand the
>   behanviour of type 9?
>
> P.S: I doesnt seem to depend on the data reader mode...
>
> Many thanks, Stefan
>
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
>
>
>
>    

-- 
***************************
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
bradley at tess-inc.com

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