[TRNSYS-users] Problems with calling EES (Type66a)
David BRADLEY
d.bradley at tess-inc.com
Thu Feb 24 12:42:51 PST 2011
Doms,
I am not aware of a limitation with respect to the number of time
steps. There is (based on what another user reported) a limit as to the
number of characters on the clipboard that can be passed between EES and
TRNSYS. In their case, there is an illegal character being passed
through the clipboard (we haven't debugged the problem yet). I wonder if
there is a conditions after 66000 time steps that results in EES being
unable to solve.
Kind regards,
David
On 2/24/2011 08:17, Doms Joris wrote:
> David,
> Thank you for the reply. The EES project was defenately openening and
> closing, but EES itself stayed open. I fixed this problem now with
> changing the pad for the EES project from
> "c:\xxx\xxx\hydraulics\EES.ees" to "\hydrolics\EES.ees".
> But now it seems that EES-TRNSYS coupling has a limited number of
> outputs, is this correct? When I run a long simulation with alot of
> timesteps, the simulation stops after a while, I think it is after
> 66000 timesteps with 20 inputs and 40 outputs with the EES-TRNSYS
> coupling. Is there a solution for this?
> Using another type is no option as I need to make calcultation with
> EES at every timestep.
> Many thanks
> Joris Doms
> ------------------------------------------------------------------------
> *Van:* David BRADLEY [d.bradley at tess-inc.com]
> *Verzonden:* dinsdag 22 februari 2011 23:40
> *Aan:* Doms Joris
> *CC:* trnsys-users at cae.wisc.edu
> *Onderwerp:* Re: [TRNSYS-users] Problems with calling EES (Type66a)
>
> 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
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> http://www.trnsys.com
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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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