Re: [TRNSYS-users] negative coupling values

[David Bradley <bradley@tess-inc.com>]

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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