[TRNSYS-users] Type164a : Compressed Gas Reservoir

[David BRADLEY]

Ghady

   The initial pressure issue is one that was fixed in later TRNSYS 
versions. Once you modify the FORTRAN then yes, you have to rebuild the 
TRNdll.dll. the FORTRAN code is just a set of text files. These are 
read, processed and turned into a DLL by the FORTRAN compiler. Only the 
DLL is accessed when TRNSYS actually runs.

   Instructions for how to rebuild the TRNDll are contained in the 
07-Programmer's Guide (in the ..\TrnsysXX\Documentation folder)

   There is no restriction in the code that limits the tank volume to 
1m3. A change to the proforma should be sufficient. Once you modify the 
proforma and save the changes, however, your changes will not be 
reflected in your project until you select the Type164 in your project, 
right click on it and select "replace" from the context menu. Find the 
modified proforma in the proforma directory and the new limit will take 
effect. As a side note, I am not clear what you mean when you "it does 
not work." Are you getting an error when you run the simulation or are 
you still unable to enter a value less than 1m3.

kind regards,

  David



On 04/13/2018 07:12, Ghady Dib via TRNSYS-users wrote:
>
> Hello,
>
> *I am modeling a 2 stages of air compressors with 2 compressed air 
> reservoirs (Type164). And I have two questions regarding:*
>
> *
> *
>
> *1)**Initial pressure of the Reservoir (Type164):*
>
> If we double click on type 164, we have access to the parameters, 
> inputs and outputs. In my project, I want to fix the pressure of the 
> reservoir (Pgas) to 1 bar. So I fixed PMAX=50bar (Para (2)) and 
> PLEV_INI=0.02 (Input (4)) in order to P_INI = PLEV_INI*PMAX*1E5 equals 
> 1 bar.
>
> When I run the project, and I plot the result, I have at t=0 PGAS 
> equals to zero (Pression.out).
>
> It’s a bit confusing to initialize the pressure because there is a 
> way_1 to fix P_ini (described above) and another way_2 to set initial 
> output values (in my case, PGAS is OUT(2)). To be on safe side I put 
> in the FORTRAN code (!set initial output value) OUT(2)=P_INI (And even 
> with this, it does not work). So what way to take in order to 
> initialize the pressure? Way 1 or 2 or both?
>
> If I modify the FORTRAN (in order to set the initial output values), 
> should I regenerate the Type164? And then rebuild new library? Or no 
> need (just save)? If yes can you tell me step by step the process to 
> rebuild the library, because I did it once not correctly (rebuild the 
> library) and I damaged all the other types.
>
> *2)**Volume of the Reservoir (Type164):*
>
> By default the minimum volume of the reservoir is 1 m^3 . In order to 
> change the interval (min, max) of the volume I did the following steps:
>
> Right click on the type à Proforma à Variables à change the min for 
> parameter 3 (VOL). Then click OK and close the Proforma after saving 
> the changes. By this, the Type 164 is changed in the library also.
>
> Problem: It does not work with the modified reservoir. In fact I 
> repeated the same project [compressor and a reservoir (VOL=1 m^3 ), 
> where the system worked]. So I guess the steps to change the VOL 
> interval are not correct.
>
>
> Thank you for help
>
> -- 
> */
>
> Ghady DIB
>
> Doctorant
>
> Laboratoire CETHIL UMR 5008 Groupe Energétique des Systèmes Thermiques 
> et Frigorifiques (ESTF) Département Génie Energétique et Environnement 
> INSA Lyon France
>
> Tel:+ (33) 6 33 52 96 74 <tel:%2B%20%2833%29%206%2033%2052%2096%2074>
>
> /*
>
>
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-- 
***************************
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

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