[TRNSYS-users] Differenece in massflow calculation for shaft opening TRNSYS-Type97 and CONTAM

[David BRADLEY]

Philipp,
   The solver within CONTAM and the solver within Type97 are different 
from one another; Type97 is a snapshot of what CONTAM was some years ago 
(2002?) rewritten in Fortran.
Regards,
  David


On 10/15/2010 09:55, Philipp Lezajic wrote:
>
> Hi,
>
> when using the "shaft" airflowpath in a building model in CONTAM I get 
> different massflows compared to using the model via type 97 in TRNSYS. 
> I use the "steady" simulation mode in CONTAM and aply the same 
> parameters (zone-temp, amb-temp, amb-pressure,etc.) to type 97 as 
> inputs. For other airflowpaths (like the two way flow -- two opening 
> used in the calling CONTAM example) the massflows are equal in TRNSYS 
> and CONTAM.
> The difference is not very big for one shaft airflowpath, but as my 
> building model has several zones on top of each other connected with 
> shaft airflowpaths (an atrium) the difference in my case is around 5%.
>
>
> Is there a difference because CONTAM and TRNSYS solve the same 
> equation system with a different solver? How can this difference be 
> rated? Are there any parameters in under Control Cards in the 
> Simulation studio that I can adapt?
>
> Again thanks in advance to everyone for help or advice!
>
> regards Philipp
>
>
>
>
>
>
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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
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d.bradley at tess-inc.com

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http://www.trnsys.com

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