[TRNSYS-users] Cooled Ceiling

[David BRADLEY]

Michael,
   The error you are getting is that the zone temperature / zone air 
flow model is not converging in type56. It is a bit hard to tell the 
cause of the problem from looking at the *.lst file. If I had to make a 
wild guess as to the cause of the problem, Type56 allows you to specify 
a constant convection coefficient or will calculate a convection 
coefficient for the inside surfaces of walls (and floors, and ceilings). 
The internally calculated convection coefficient depends on the 
difference (and on the sign of the difference) between the surface 
temperature and the air temperature. I would guess that something in the 
way that you have defined the cooled ceiling is causing the convection 
coefficient not to converge; perhaps the cooled ceiling has too large a 
capacity, perhaps the inlet temperature is so low that the surface 
temperature is not reasonable, perhaps the controls on whether flow is 
going to the chilled ceiling do not have enough hysteresis. You might 
start by trying to get the model to run with a constant convection 
coefficient for the chilled ceiling.
Kind regards,
  David


On 5/2/2012 07:43, e0526036 at student.tuwien.ac.at wrote:
> Dear TRNSYS-users,
>
> I am trying to simulate a cooled ceiling. However, as soon as I start 
> the simulation (F8) an alert appears as can be seen in the attachment. 
> Further, I cannot edit the Building (Type 56) anymore and I have to 
> restart from the last backup.
>
> I have attached the .lst file as well.
>
> Thank you very much for your suggestions!
> Kind regards
>
> Michael Mischkot
>
>
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> TRNSYS-users at cae.wisc.edu
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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
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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