[TRNSYS-users] negative coupling values

[David Bradley]

Mattheiu,
   I have not run into that error but I would 
guess that it means that the air flow from zone A 
to zone B was calculated as a negative number. 
Airflow from zone A to zone B must always be 
positive. If the air flow turns around and flows 
the other direction then you need to define a 
coupling air flow rate from zone B to zone A. The 
reason for this is that by defining only positive 
air flows (perhaps in both directions) you can 
define a mixing flow, not just a net flow between the two zones.
Cheers,
David


At 09:52 6/20/2007, Matthieu Cosnier wrote:
>Dear TRNSYS users
>Does anybody know what  the error message "negative coupling value" mean?
>It seems to be due to type 56.
>My simulation program works usualy but not for a 
>particular ventilation air flow rate.
>Thanks for your answers
>
>COSNIER Matthieu
>
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>Campus Scientifique Savoie Technolac
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>email: matthieu.cosnier at etu.univ-savoie.fr
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