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

David BRADLEY d.bradley at tess-inc.com
Tue Feb 22 14:40:04 PST 2011


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
>
> ------------------------------------------------------------------------
> This e-mail, any attachments and the information it contains are 
> confidential and meant only for the use of the addressee(s) only.  
> Access to this e-mail by anyone other than the addressee(s) is 
> unauthorized.  If you are not the intended addressee (or responsible 
> for delivery of the message to such person), you may not use, copy, 
> distribute or deliver to anyone this message (or any part of its 
> contents) or take any action in reliance on it.  In such case, you 
> should destroy this message and notify the sender immediately.  If you 
> have received this e-mail in error, please notify us immediately by 
> e-mail or telephone and delete the e-mail from any computer.
> All reasonable precautions have been taken to ensure no viruses are 
> present in this e-mail and its attachments.  As our company cannot 
> accept responsibility for any loss or damage arising from the use of 
> this e-mail or attachments we recommend that you subject these to your 
> virus checking procedures prior to use.
> ------------------------------------------------------------------------
>
>
> _______________________________________________
> 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/20110222/a739c47a/attachment-0005.htm>


More information about the TRNSYS-users mailing list