[TRNSYS-users] initial iterations for the first hour on simulation ?

[David BRADLEY]

Ayman,
   All TRNSYS types have initial values. The initial values are set by 
the user and as the driving forces of the system begin to change 
(ambient temperature, solar radiation, occupancy, etc) start to change 
then TRNSYS beings to iterate. In high-mass models (such as buildings 
and thermal storage tanks) the initial values have an important impact 
on their behavior as the simulation starts going. Iterating more in the 
first hour isn't going to change anything; the models still start out 
with those initial values and none of the driving forces have changed 
yet. If you are concerned about the impact of initial values then the 
best approach may be to run your simulation for two simulation years and 
only take the results from the second year.
Best,
  David


On 8/3/2011 13:02, Ayman Sarwa wrote:
> Hi All
> I am simulating a Zone with Trnsys & TrnBuild to get the 
> Floating Temperature (i.e there is no  heating or cooling ) , I note 
> that the initial value of temperature entered into TrnBuild for this 
> zone has big influences on the first few hours of simulation. I use 
> Trnsys 17.
> my question is that, Is there method to make Trnsys simulates or makes 
> initial iterations for the first hour on simulation and then complete 
> the dynamic simulation?
> thanks in advance
> -- 
> Regards
> Ayman Mohamed
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users

-- 
***************************
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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/attachments/20110803/57e1c49f/attachment-0001.htm>