[TRNSYS-users] Optimisation.

[David Bradley]

Didier,
   There is a line in the BUI file:

OUTPUTS
  TRANSFER : TIMEBASE=1.000

and while I presume that you could define the timebase using a variable, 
I am not sure if there is a way to prevent GenOpt from trying to choose 
a value of that variable.

In my experience, while there is a dependence on the time base, when 
doing comparison between two possibilities, it is best to choose a 
single time base for both of them. Also, for most constructions, a time 
base of 1hr is satisfactory.
Best,
  David


On 7/7/2010 06:39, gossard at cict.fr wrote:
> Hi all,
>
> I want to find the optimal characteristics (minimising the annual 
> energy-consumption) of the massive part of the external wall and study 
> the influence of the insulation layer (position or/and nature) on the 
> optimal characteristics of the massive part. My variables are the 
> conductivity, the capacity and the density of the massive part. I'm 
> using GenOpt2 and TRNSYS 16 for that.
> If I understood correctly, the calculations of heat transfer through 
> the wall depend on the nature of the wall (if it is heavy or light) 
> and so, they depend on the wall time base. But how to adapt this wall 
> time base to the nature of each wall ? Is it possible to do it with 
> GenOpt commands ?
>
> Please, find enclosed my BUI-file. The external wall I want to 
> optimize is called "MUREXT34" (external wall) and I search the optimal 
> characteristics of "PARPAING" (massive part).
>
> Best regards,
> Didier Gossard.
>
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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
bradley at tess-inc.com

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

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