Re: [TRNSYS-users] problem of escalade

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

Aleck,
  The steps that you are seeing in some of the temperature plots are probably a result of timebase that you have chosen for the walls in your building. Wall response factors are computed for a series of discrete times extending backwards through the history of the wall. If you use a simulation time step that is less than the wall timebase then the conduction transfer function has a constant value for a few timesteps until the end of the next timebase is reached, then they change and you end up seeing that stepped response. The ideal solution is to use a wall timebase that is as close as possible to your simulation timestep. That is not always feasible though; so I typically use a 0.25hr timebase and a 1 or 5 minute time step.
best,
 david


On 6/21/2012 10:40, Yujun TAO wrote:

Dear trnsys users,

I have a problem about the two tempreatures simulated: TiZONE1 and TiZONEPLATRE, in the graphic of TRNEXE, the two curves follow well at the big tendance with the experimentation's results, but at detail's view, there are somes escalades, i don't understand.

Could someone tell me why?

Here are jointed files to check

Kind regards

Aleck TAO

_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@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@tess-inc.com

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