Re: [TRNSYS-users] problem with comis

["keilholz, werner" <werner.keilholz@cstb.fr>]

Delphine,

 

This type of problem is best investigated in a COMIS stand-alone simulation (without TRNSYS) first.

 

This way, you can better understand the airflow modelling phenomena alone (without the influence from thermal problems) - which is actually one of the big advantages of using this coupling (you can run the COMIS part without the TRNSYS side - just click on the COMIS project window (*.cpf) and run a COMIS simulation with fixed temperatures / wind / etc. Then you can easily determine the influence of each phenomenon. At the end, go back to the coupled simulation (.tpf) ).

 

If you need help on the air flow part, you can use the expertise of the quite active COMIS user community :

 

http://groups.yahoo.com/group/comis

 

You will find almost 500 COMIS users and the world's top-experts on air flow modelling on this group.

 

Werner

PS: A similar group exists for CONTAM users: http://groups.yahoo.com/group/CONTAM/

 

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De : trnsys-users-bounces@engr.wisc.edu [mailto:trnsys-users-bounces@engr.wisc.edu] De la part de OCTRUE, Delphine
Envoyé : vendredi 28 juillet 2006 17:21
À : trnsys-users@engr.wisc.edu
Objet : [TRNSYS-users] problem with comis

 

Hello!

 

I try to design a double skin facade with Trnsys and Comis.I have cut the double skin facade in 4 zones (corresponding to the 4 storeys). The double skin facade has no mecanical ventilation but has two openings downward and upward. I don't know how modelize these openings : I want to add a grid before the air incomming, so I use the type "duct, entry with screen" in comis. But my simulation in trnsys gives me very high coupling air flow (20 000 kg/h) and no infiltration (although the % of screen is 90). I think it's not good because in reality, there are dynamic loss which drop the airflow! Their is also no temperature stratification. When I replace this duct with an open window, I have more accurate results : air coupling flow with 6000kg/h (but it seems still high), infiltration in the extremity of facade and temperature stratification.

 

Have somebody already worked on double skin facade? Or does someone know why the screen gives me bad results?

If you need more information, ask me.

 

Thanks a lot for your answers

Best regards

 

Delphine

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