Search found 21 matches

by warrick
Fri Apr 06, 2018 7:42 am
Forum: Vensim
Topic: Where is "vendll32.dll" file?
Replies: 10
Views: 6510

Re: Where is "vendll32.dll" file?

Hi again, From http://vensim.com/comparison/ the Model Reader does allow DLL configuration (as shown on the last row of table). Thus, the example file should work on a computer/system without Vensim DSS installed. As requested below, please indicate how to get the DLL setup to work with Java. Side n...
by warrick
Thu Apr 05, 2018 10:19 am
Forum: Vensim
Topic: Where is "vendll32.dll" file?
Replies: 10
Views: 6510

Re: Where is "vendll32.dll" file?

Yes using 32 bit version of java (1.8) So I have the dll and gave it to the developer but his issue is now that that application he is building tells him he needs to reinstall vensim, he has installed the ModelReader but that doesn't seem to fix the problem. Reading the documentation a bit it mentio...
by warrick
Wed Apr 04, 2018 3:31 pm
Forum: Vensim
Topic: Where is "vendll32.dll" file?
Replies: 10
Views: 6510

Re: Where is "vendll32.dll" file?

Hi, Vensim DDS Version 7.1 Single Precision (x32) I am getting he same error message: "Cannot load native library. Error: java.lang.UnsatisfiedLinkError: no vendll32 in java.library.path ". Getting the same error message with sample java application provided. Please indicate how this was s...
by warrick
Tue Jan 02, 2018 10:31 am
Forum: Vensim
Topic: Thermodynamic Properties of Water and Steam (IF97 equations)
Replies: 13
Views: 26769

RE: Thermodynamic Properties of Water and Steam (IF97 equations)

Sorry for the delay. After extracting the provided zip folder I saved VensimCoolPropIF97.dll under C:\Users\Public\Vensim\plugins and then directed Vensim to the .dll file with Tool > Options > Startup: External function library. The IF97 functions are now like built in functions, under User Defined...
by warrick
Fri Dec 22, 2017 6:52 am
Forum: Vensim
Topic: Thermodynamic Properties of Water and Steam (IF97 equations)
Replies: 13
Views: 26769

RE: Thermodynamic Properties of Water and Steam (IF97 equations)

Yes GitHub is based on the same documentation as the Excel Add-In from the International Association for the Properties of Water and Steam. MIT has actually taken it further by including the backward equations - returns Temperature. The IF (IF97) stands for Industrial Formulation. Really cool, great...
by warrick
Thu Dec 21, 2017 7:44 pm
Forum: Vensim
Topic: Thermodynamic Properties of Water and Steam (IF97 equations)
Replies: 13
Views: 26769

RE: Thermodynamic Properties of Water and Steam (IF97 equations)

Sorry for the delay. I also thought about the Lookup option but this has its drawbacks as the phase (superheated, saturated, compressed) would need to be 'set' per point in the steam cycle. If time does not allow for the below to work out then I will look into it further. It would be cool to compare...
by warrick
Wed Dec 20, 2017 6:51 pm
Forum: Vensim
Topic: Thermodynamic Properties of Water and Steam (IF97 equations)
Replies: 13
Views: 26769

Thermodynamic Properties of Water and Steam (IF97 equations)

Good day, Using: Vensim 7.1 DSS I have a similar query to the two links below which both aimed to have a 'dynamic' link with Excel. Not sure how it was solved in the end, hence this post. https://www.ventanasystems.co.uk/forum/viewtopic.php?f=2&t=5009 https://www.ventanasystems.co.uk/forum/viewt...
by warrick
Wed Dec 06, 2017 8:32 am
Forum: Vensim
Topic: Subscript reshape (stitching)
Replies: 4
Views: 2785

Re: Subscript reshape (stitching)

Thanks Tom. :D I got the long clumsy IF THEN ELSE way to work but that is a total of 295 of them! Yes, the Administrator is correct it is not fun to debug that. The example Tom attached allows one to go from two subscripts (for example subscript A by Subscript B) to one subscript (for example C) the...
by warrick
Tue Dec 05, 2017 3:01 pm
Forum: Vensim
Topic: Subscript reshape (stitching)
Replies: 4
Views: 2785

Subscript reshape (stitching)

Good day, Using: Vensim 7.1 DSS After hours of trying to figure this out, including review of the reference material I hope you can help. Background: I am modelling electricity demand. An input is the sub-hourly daily demand profiles (48 off per day) per Customer Group (for instance residential). Pe...
by warrick
Sun Aug 28, 2016 8:50 pm
Forum: Vensim
Topic: Optimization of time dependent variable (non-constant) for electricity generation expansion planning
Replies: 11
Views: 8323

Re: Optimization of time dependent variable (non-constant) for electricity generation expansion planning

Optimizer sorted. The outputs used in the objective function were not correctly defined when guaranteed output was greater than the required demand. Thank you it works :)
by warrick
Mon Aug 08, 2016 4:34 pm
Forum: Vensim
Topic: Optimization of time dependent variable (non-constant) for electricity generation expansion planning
Replies: 11
Views: 8323

Re: Optimization of time dependent variable (non-constant) for electricity generation expansion planning

Thanks tomfid. I will make use of command script once optimization is finalized. I apologise for not better searching for this within the user manual. I am busy writing up my thesis and would appreciate your feedback regarding the optimization outputs/setup. As stated, I can 'manually' alter the opt...
by warrick
Wed Aug 03, 2016 3:51 pm
Forum: Vensim
Topic: Optimization of time dependent variable (non-constant) for electricity generation expansion planning
Replies: 11
Views: 8323

Re: Optimization of time dependent variable (non-constant) for electricity generation expansion planning

Sorry only three attachments are allowed and I removed the wrong one. Attached. SearchFunction.voc Further to above, when slowly varying the weighting between cost (50 to 100%) and CO2 emissions (50 to 0%) one would expect the outputs of the cases to follow a 'trend'. Overall it does but the new bui...
by warrick
Wed Aug 03, 2016 2:26 pm
Forum: Vensim
Topic: Optimization of time dependent variable (non-constant) for electricity generation expansion planning
Replies: 11
Views: 8323

Re: Optimization of time dependent variable (non-constant) for electricity generation expansion planning

Thank you for the feedback tomfid. Since last post the simultaneous equations have been fixed (http://www.ventanasystems.co.uk/forum/viewtopic.php?f=2&t=6356) and constraints included as continuous and derivable based on post http://www.ventanasystems.co.uk/forum/viewtopic.php?f=15&t=3552&am...
by warrick
Wed Jul 27, 2016 10:58 pm
Forum: Vensim
Topic: Error with Allocate Available - subscript range error
Replies: 5
Views: 4102

Re: Error with Allocate Available - subscript range error

Thank you so much tomfid. :D The model is working! I am using Vensim DSS for Windows Version 6.3 (x32). The simultaneous equation error is a lot more useful than "ALLOCATE_AVAILABLE/FIND_MARKET_PRICE" error. It is strange that the former did not show with my version as I did have such an e...
by warrick
Wed Jul 27, 2016 1:01 pm
Forum: Vensim
Topic: Error with Allocate Available - subscript range error
Replies: 5
Views: 4102

Re: Error with Allocate Available - subscript range error

Thank you for the reply tomfid. I have attached the model with input data (excel spreadsheet). The two ALLOCATIONS are for 1. Generation Capacity (new generation plants required to satisfy demand "New Allocated Capacity") and 2. Least Cost Dispatch (how to dispatch the generation plants in...
by warrick
Tue Jul 26, 2016 4:52 pm
Forum: Vensim
Topic: Error with Allocate Available
Replies: 12
Views: 9252

Re: Error with Allocate Available

Thank you Adminstrator. I have done so at:
http://www.ventanasystems.co.uk/forum/v ... f=2&t=6356
by warrick
Tue Jul 26, 2016 4:50 pm
Forum: Vensim
Topic: Error with Allocate Available - subscript range error
Replies: 5
Views: 4102

Error with Allocate Available - subscript range error

Hello, Please refer to the link for background to my model: http://www.ventanasystems.co.uk/forum/viewtopic.php?f=2&t=6349&p=22610&hilit=warrick&sid=4b4e53320d29e4ccafdce7171c263957#p22610 I have the same error as a post of over a decade ago: http://www.ventanasystems.co.uk/forum/vie...
by warrick
Sun Jul 24, 2016 9:24 pm
Forum: Vensim
Topic: Error with Allocate Available
Replies: 12
Views: 9252

Re: Error with Allocate Available

Hello, Please refer to the link for background to my model: http://www.ventanasystems.co.uk/forum/viewtopic.php?f=2&t=6349&p=22610&hilit=warrick&sid=4b4e53320d29e4ccafdce7171c263957#p22610 I am having the same error with Version 6.3 as discussed in this thread . It has been more than...
by warrick
Wed Jul 20, 2016 11:31 pm
Forum: Vensim
Topic: Optimization of time dependent variable (non-constant) for electricity generation expansion planning
Replies: 11
Views: 8323

Re: Optimization of time dependent variable (non-constant) for electricity generation expansion planning

Thank you for the response tomfid. I was reluctant to use the mentioned second option due to the "suppressed feedback loops" and other comments from posters. I have followed the VECTOR LOOKUP approach and the optimizer is operating. The optimizer finds the number of plants to be built per ...
by warrick
Wed Jul 20, 2016 12:12 pm
Forum: Vensim
Topic: Optimization of time dependent variable (non-constant) for electricity generation expansion planning
Replies: 11
Views: 8323

Re: Optimization of time dependent variable (non-constant) for electricity generation expansion planning

Dear Administrator, I have attached the model with input file (excel spreadsheet) and the optimizer control file. Let me know how I can talk you through the model and clearly explain my technical requirements. Possible to private message/skype? I think what you are saying is that I would need to cre...
by warrick
Wed Jul 20, 2016 11:23 am
Forum: Vensim
Topic: Optimization of time dependent variable (non-constant) for electricity generation expansion planning
Replies: 11
Views: 8323

Optimization of time dependent variable (non-constant) for electricity generation expansion planning

Good day, This post is similar to http://www.ventanasystems.co.uk/forum/viewtopic.php?f=2&t=4195&p=13729&hilit=optimizer+over+vector#p13729. Background: I am developing a model for electricity generation expansion planning similar to https://www.energypolicy.solutions/ (EPS model (also u...