[TRNSYS-users] Problem with type 9a reading data values

[David BRADLEY]

Kordu,
   One thing to be careful of is that if you change the units of the 
simulation time step to minutes (from its default of hours) and enter a 
value of 5, then change the units back to hours, you'll notice that the 
conversion is not perfect. Also 5 minutes, expressed in hours, is a 
continuously repeating decimal. What I would recommend is that you enter 
the following two lines in the "control cards" field:

EQUATIONS 1
delt = 5/60

set both the simulation time step and the Type9 data interval parameter 
to units of "string" and enter the name of the equation that you 
defined: delt. This will force both the simulation time step and the 
data interval to be the result of two integers divided by each other and 
they will be precisely equal as far as the TRNSYS engine is concerned. 
My guess as to the cause of your problem is that where the TRNSYS engine 
is concerned, the two values are not identically equal.

You might also look at the example:

..\Trnsys16_1\Examples\Reading Data Files\DataReaders.tpf

It is often easier to start with something that already works!!
regards,
  David


On 9/20/2011 03:59, kordou wrote:
>
> Hi,
>
> I am trying to valuate a new type that I have made in trnsys 16 with 
> some experimental measurements.
>
> To do this I need to import some measurement weather data (Total solar 
> rad, Tamb, Wind speed and direction, RH, a room temperature, and a 
> voltage)
>
> The measurements that I have are based on time interval of 5min.
>
> So I fount that I could use the type9a (Utility àData readers 
> -->Generic Data FilesàFirst Line is Simulation Start àFree Format)
>
> The problem that I have is that if I input a dt=5min on type9a and the 
> same dt in simulation, it does not run.
>
> If I Input dt=5min on Type9a and 1min in simulation it runs but in 
> results of the total simulation time is the double minus 1 hour from 
> the expected!!!
>
> With that I mean that I got the results of one day (24 hr) twice in 
> this time period minus 1 hr.  (For 24 hours of simulation I got a 
> curve of 47 hours)
>
> It is like the trnsys reads the input file in about the half time of 
> the real so I get 2 times this file
>
> Could someone help here?
>
> Thank you in advanced
>
> Regards
>
> Kordou
>
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/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
d.bradley at tess-inc.com

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/attachments/20110923/84d7855e/attachment-0001.htm>