[TRNSYS-users] Type97 error

David BRADLEY via TRNSYS-users trnsys-users at lists.onebuilding.org
Mon Oct 31 07:27:51 PDT 2016


   If your project has a lot of horizontal openings then this is common 
problem. There are a couple of ways to work towards a solution.

   First, you can increase the number of iterations that CONTAM allows 
by editing the *.air file. The first value in the third line of the file 
is the allowable number of iterations. By default it is set to 30. I 
usually increase it to 100.

   Second, you may need to artificially delay the coupling between 
TRNSYS and CONTAM. I usually delay the temperatures of the airnodes 
coming from Type56 and being passed to CONTAM by using either Type93 or 
Type661. If you do this, it is very important that you also use a short 
timestep of 5 minutes or less) or else the assumption of delayed times 
becomes unrealistic.

kind regards,


On 10/30/2016 19:19, ahmed serageldin via TRNSYS-users wrote:
> Dear all
> I try to couple between ContamW3 and TRNSYS Release 17.01.0028 via 
> Type 97 and Type 65 to simulate natural ventilation through windows 
> but i get this error
> Message               : The multizone airflow model did not converge 
> in the maximum number of iterations.
> What is the error exactly and what should i do to solve
> *Yours sincerely;*
> *
> Eng: Ahmed Mohamed Awad
> *
> *Ph.D student*
> *Energy Resources Engineering Department(ERE)*
> *Egypt-Japan University of Science and Technology(EJUST)*
> *Mob:+2010-65078029*
> *Email: ahmedawadserageldin at gmail.com 
> <mailto:heba_abadi at hotmail.com> - **ahmed.serageldin at ejust.edu.eg 
> <mailto:heba.abbadi at ejust.edu.eg>*
> *Website: **www.ejust.edu.eg <mailto:heba.abbadi at ejust.edu.eg>*
> *P.O. Box 179, New Borg El-Arab City, Postal Code 21934, Alexandria, 
> Egypt*
> P*Please consider the environment and don't print this e-mail unless 
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Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

d.bradley at tess-inc.com


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