[TRNSYS-users] type 9 connection with type 907

[David BRADLEY]

Federica,

   Without looking at the project it is hard to guess what the cause of 
the problem might be. I would recommend that you make a simulation that 
uses only the Type9 and an online plotter (Type65). Connect them 
together and make sure that Type9 is outputting what you think it 
should. Only once that part is operating correctly would I recommend 
that you attach Type9 to Type907.

   One possible issue is that Type907 reads the engine performance from 
a data file and while it is able to interpolate between data file values 
within the range given in the file, it is not able to extrapolate beyond 
the data file. If you have a data file for a smaller engine and you are 
always asking it to meet an electrical load that is greater than its 
capacity, then all Type907 can do is return the performance of the 
engine as close to the desired operating point as possible.

kind regards,

  David



On 08/23/2018 05:53, Federica Azzarri S238292 via TRNSYS-users wrote:
> Hi everyone,
>
> I'm using TRNSYS 17 to model an internal combustion engine (type 907). 
> Type 907 requires the value of the desired electrical power as an 
> input so I'm to trying to give this input using type 9, which reads 
> .dat files, but I'm facing two problems. First of all I tried to do an 
> hourly simulation on 1 day (24 values of desired electric power) but, 
> even though all the 24 input values are different, type 907 outputs 
> are all the same for each timestep. Moreover I noticed that these 
> outputs are not consistent because if I run the simulation using just 
> one input value of the desired electric power (I directly insert the 
> value inside type 907, without using type 9) I obtain different 
> outputs with respect to the same input value added through type 9.
> How could I avoid these problems?
>
> Thanks in advance to anyone will try to help me,
> Federica.
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>

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
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
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