Re: [dwsim-users] Shortcut Distillation: DWSIM 3 vs DWSIM 4

[Hector P. <hpe...@gm...>]

Thanks Daniel. I'll be looking forward to the releases. I was trying to do
it with ChemSep, but had some convergence issues with the column. I'll see
if I can get one or the other to converge and use that one. Thank you.

Hector D. Perez

On Fri, Jul 29, 2016 at 9:40 AM, Daniel Wagner <dan...@gm...> wrote:

> This is after applying the same fix to DWSIM 3:
>
> [image: Imagem inline 1]
>
> A final v3.7 build will be released together with DWSIM v4.0 with some
> critical bug fixes for those who prefer v3. They can be installed
> side-by-side on the same machine.
>
> Regards
> Daniel
>
> 2016-07-29 10:36 GMT-04:00 Daniel Wagner <dan...@gm...>:
>
>> Hi Hector,
>>
>> The IO Flash algorithm was enhanced in DWSIM 4. There are a few
>> additional checks to ensure convergence. In DWSIM 3 it is converging
>> earlier than expected for your case.
>>
>> And you're still struggling with this system in DWSIM. You really should
>> use ChemSep's column and thermo models through the CAPE-OPEN interface.
>>
>> Daniel
>>
>> 2016-07-29 10:08 GMT-04:00 Hector Perez <hpe...@gm...>:
>>
>>> Hi Daniel,
>>>
>>> I have set up shortcut distillations for a Sulfuric Acid - Nitric Acid -
>>> Water system. However, I am getting very different results depending on
>>> which version of DWSIM I use. I have checked that my settings are the same
>>> in both simulations (NRTL constants and Inside-Out VLE flash algorithm).
>>> DWSIM 3 predicts 21 minimum stages, whereas DWSIM 4 predicts only 3 stages.
>>> I am running with a issue in DWSIM 3: it is not predicting the actual
>>> number of stages (only predicts the minimum number) or the optimal feed
>>> stage. Both of these values show NaN.
>>>
>>> I would appreciate any insight here.
>>>
>>> I still haven't gotten the rigorous columns to converge on these
>>> simulations. If you have any tips here, I'd appreciate them.
>>>
>>> I have attached 2 files, the first one (D3) is the DWSIM 3 file and the
>>> second one is the DWSIM 4 file.
>>>
>>> Thank you for your time,
>>>
>>> Hector D. Perez
>>>
>>
>>
>