[TRNSYS-users] Problems with calling EES (Type66a)

[David BRADLEY]

Joris,
   It isn't actually the opening and closing that takes time (EES stays 
running the whole time). The slowness is the EES calculation time and 
the fact that EES is called at every single timestep and at every single 
iteration within a timestep of your TRNSYS simulation. There are a few 
different versions of Type66 that allow you to avoid calling EES 
whenever possible (basically an input that is an on/off switch for the 
EES calculations). If you know that your EES program doesn't have to be 
called (because the device that it models is inactive) then you can 
"turn off" the call to Type66 and save some time. Take a look at the EES 
example in the ..\TrnsysXX\Examples\Calling_EES\ directory; all the 
different options are shown in there.
Kind regards,
  David


On 2/20/2011 15:43, Doms Joris wrote:
> Dear TRNSYS users,
> When simulating an applied thermal system, I'm using EES for the 
> hydronic part. I programmed the hydronic circuit in EES and coupled it 
> with TRNSYS via Type 66a. This coupling works fine, but;
> The problem is that the simulation runs very slow. Every timestep that 
> TRNSYS calls EES, the EES project is opened and closed. Is there a way 
> to set some settings so EES isen't closed and reopened each time, this 
> would minimize the solution time alot.
> Thanks on advance
> Joris Doms
>
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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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