Hi Hans I think that your explanation for the possible cause of this sounds plausible, but we really need to test this using your model code, in case it really is a bug. Please send us a complete working example that shows the problem. You can remove the key equations or whatever, if you want to keep them private. You can send the code off-list if you want, and we won't publicise it.
Cheers JP [email protected] wrote: > 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 >>>> >>>> >>>> ------------------------------------------------------------------------------ >>>> This SF.Net email is sponsored by the Verizon Developer Community >>>> Take advantage of Verizon's best-in-class app development support >>>> A streamlined, 14 day to market process makes app distribution fast and >>>> easy >>>> Join now and get one step closer to millions of Verizon customers >>>> http://p.sf.net/sfu/verizon-dev2dev >>>> _______________________________________________ >>>> Ascend-sim-users mailing list >>>> [email protected] >>>> https://lists.sourceforge.net/lists/listinfo/ascend-sim-users >>>> >>> > > ------------------------------------------------------------------------------ > This SF.Net email is sponsored by the Verizon Developer Community > Take advantage of Verizon's best-in-class app development support > A streamlined, 14 day to market process makes app distribution fast and easy > Join now and get one step closer to millions of Verizon customers > http://p.sf.net/sfu/verizon-dev2dev > _______________________________________________ > Ascend-sim-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/ascend-sim-users > -- Dr John Pye Dept of Engineering Australian National University ------------------------------------------------------------------------------ Throughout its 18-year history, RSA Conference consistently attracts the world's best and brightest in the field, creating opportunities for Conference attendees to learn about information security's most important issues through interactions with peers, luminaries and emerging and established companies. http://p.sf.net/sfu/rsaconf-dev2dev _______________________________________________ Ascend-sim-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ascend-sim-users
