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

[Doms Joris]

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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