Krishnan, thanks for the quick response!
An illustration of what I would like to do would be
(* This is supposed to be the model for a pervaporation membrane *)
MODEL pervap_membrane;
(* The components we are dealing with:
I added component data for tert_butyl_methyl_ether myself *)
cd IS_A
components_data(['methanol','tert_butyl_methyl_ether','butene_1'],'methanol');
(* L-stream: Stream on *)
highP_pd IS_A phases_data ('L','none','UNIFAC_liquid_mixture','none');
highP_eq IS_A boolean;
L_stream IS_A stream(cd,highP_pd, highP_eq);
FOR i IN cd.components CREATE
VP[i] ALIASES
L_stream.phase[L_stream.pd.reference_phase].pure[i].VP;
END FOR;
*** equation involving VP[i] explicitly ****
END pervap_membrane;
but this fails due to "impossible RHS of ALIASES".
Hans
> On Wed, Jan 6, 2010 at 5:48 PM, Krishnan Chittur <[email protected]> wrote:
>> Hans ... It could help if you include the models ... I (or someone else) can
>> then try and debug that
>>
>> Krishnan
>>
>> On Wed, Jan 6, 2010 at 10:27 AM, <[email protected]> wrote:
>>>
>>> Hi,
>>>
>>> I am new to ASCEND, so please excuse if this question is a bit dumb.
>>>
>>> I am trying to implement a model where I have a stream model, and a
>>> set of additional equations, some of which include the vapor pressure
>>> explictly.
>>>
>>> I am, however, unable to get the values of the vapor pressure from the
>>> model. When I load it into the graphical interface, I can see the
>>> values for component i in the tree as
>>>
>>> L_stream.phase[L_stream.pd.reference_phase].pure[i].VP
>>>
>>> If I try to access them in the same way in my model I get an error
>>> that this value does not exist. I suppose that this is because of the
>>> hierarchy of the objects, and the stream only knows that what he has
>>> there is a phase_partial, which does not have a VP variable, but I am
>>> actually using a derived class.
>>>
>>> My question: Is there an easy way to extract the value for the vapor
>>> pressures from a stream?
>>>
>>> Thanks!
>>>
>>> Hans
>>>
>>>
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