Activity for ioncube
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ioncube posted a comment on discussion Linux Platform (New UI)
No I am trying new UI Further findings while searching other forums In the DWSIM deb there are these files available /usr/local/lib/dwsim$ ls -k -s | grep Python.Run 16 Python.Runtime.deps.json 396 Python.Runtime.dll 4 Python.Runtime.dll.config 180 Python.Runtime.pdb But these file also available when you install pythonnet via pip ~/Binaries/miniconda3.10/lib/python3.10/site-packages/pythonnet/runtime$ ls -k -s | grep Python.Run 12 Python.Runtime.deps.json 424 Python.Runtime.dll 192 Python.Runtime.pdb...
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Dear friend please help me out. This is not working. This folder is now completely empty: /usr/local/lib/dwsim/extenders
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Dear friend please help me out. This is not working.
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Thanks for replying. But it isnt the solution to python problem. I think this integration should be more smoother in Linux platforms. However my problem is referenced before as well : https://sourceforge.net/p/dwsim/discussion/mac_newui/thread/fe96433bcb/
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Error log 2023-11-28 18:38:01.3782 Extender Initialization System.NullReferenceException: Object reference not set to an instance of an object at AutomaticTranslation.AutomaticTranslator.SetMainWindow (System.Windows.Forms.Form mainwindow) [0x0004c] in <dd9aae1bdf604acfa8a151e6ab29149d>:0 at DWSIM.FormMain.LoadExtenders () [0x00418] in <b757939e07c641f98bd9f6da26d95b13>:0 2023-11-28 18:39:20.0186 Extender Initialization System.NullReferenceException: Object reference not set to an instance of an...
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From the DWSIM Application Data folder in $HOME, there is a .ini for DWSIM settings. I will extract it partially here: [OctaveBridge] OctavePath = OctaveProcessTimeout = 15 [PythonBridge] PythonPath = PythonProcessTimeout = 1 [OSInfo] Platform = Linux Environment = 64 Application fails to launch if I do either of following case. It just show splash screen & dies PythonPath = /usr/lib/x86_64-linux-gnu/libpython3.10.so OR PythonPath = /home/ukhan/Binaries/miniconda3.10/lib/libpython3.10.so Should I...
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SOLVED
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The density routine for mixtures use molar fractions for density calculations for mixtures. However I have found that mass fractions produce more proper results, close to reality. For instance ∑ [xi * ρi] leads to less values while ∑ [mi * ρi] produce much better result 0.16180186x2130+0.83819814 x958= 1147.63177992 [bad] 0.31x2130+0.69x958 = 1321.32 [ok] These lines https://github.com/DanWBR/dwsim/blob/554110f200ea055a29a872f216879744385efa31/DWSIM.Thermodynamics/PropertyPackages/PropertyPackage.vb#L5327C1-L5332C23...
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The density routine for mixtures use molar fractions for density calculations for mixtures. However I have found that mass fractions produce more proper results, close to reality. For instance ∑ [xi * ρi] leads to less values while ∑ [mi * ρi] produce much better result 0.16180186x2130+0.83819814 x958= 1147.63177992 [bad] 0.31x2130+0.69x958 = 1321.32 [ok] This line https://github.com/DanWBR/dwsim/blob/554110f200ea055a29a872f216879744385efa31/DWSIM.Thermodynamics/PropertyPackages/PropertyPackage.vb#L5329...
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The density routine for mixtures use molar fractions for density calculations for mixtures. However I have found that mass fractions produce more proper results, close to reality. For instance ∑ [xi * ρi] leads to less values while ∑ [mi * ρi] produce much better result 0.16180186x2130+0.83819814 x958= 1147.63177992 [bad] 0.31x2130+0.69x958 = 1321.32 [ok]
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The density routine for mixtures use molar fractions for density calculations for mixtures. However I have found that mass fractions produce more proper results, close to reality. For instance ∑ [xi * ρi] leads to less values while ∑ [mi * ρi] produce much better result 0.16180186x2130+958x0.83819814 = 1147.63177992 [bad] 0.31x2130+958x0.69 = 1321.32 [ok]
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The density routine for mixtures use molar fractions for density calculations for mixtures. However I have found that mass fractions produce more proper results, close to reality. For instance ∑ [xi * ρi] leads to less values while ∑ [mi * ρi] produce much better result 0.161801862130+9580.83819814 = 1147.63177992 [bad] 0.312130+9580.69 = 1321.32 [ok]
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The density routine for mixtures use molar fractions for density calculations for mixtures. However I have found that mass fractions produce more proper results, close to reality. For instance ∑ [xi * ρi] leads to less values while ∑ [mi * ρi] produce much better result
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Secondly, can you provide an example for using this function get() & set() https://dwsim.org/api_help/html/P_DWSIM_Thermodynamics_BaseClasses_ConstantProperties_Z_Rackett.htm
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I did that but no success, there is a problem with this line matstr.SetProp('density', 'OverallLiquid', '', '', '', propval) or matstr.SetProp('density', 'OverallLiquid', '', 'Mixture', '', propval)
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Lets ditch Override & use scripts dialogue . SetProp is not working here, It should be straight word as per API matstr = Flowsheet.GetFlowsheetSimulationObject('FNaOH') densobj = matstr.GetPhase('OverallLiquid').Properties.density Flowsheet.WriteMessage('Echo1 ' + str(densobj)) m_fr = matstr.GetPhase('OverallLiquid').Compounds['Sodium Hydroxide'].MassFraction * 100 m_temp = matstr.GetTemperature() propval = 1239.652 + 9.722088*m_fr - 0.68301*m_temp matstr.SetProp('density', 'OverallLiquid', '', '',...
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Lets ditch Override & use scripts dialogue . SetProp is not working here, It should be straight word as per API matstr = Flowsheet.GetFlowsheetSimulationObject('FNaOH') densobj = matstr.GetPhase('OverallLiquid').Properties.density Flowsheet.WriteMessage('Echo1 ' + str(densobj)) m_fr = matstr.GetPhase('OverallLiquid').Compounds['Sodium Hydroxide'].MassFraction * 100 m_temp = matstr.GetTemperature() propval = 1239.652 + 9.722088*m_fr - 0.68301*m_temp matstr.SetProp('density', 'OverallLiquid', '', '',...
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Firstly I updated density of NaOH + H2O mixture using this code [https://dwsim.org/wiki/index.php?title=Overriding_Calculated_Properties] densobj = matstr.GetPhase('OverallLiquid').Properties.density if (densobj <> None): currval = densobj # get massFrac of NaOH m_fr = matstr.GetPhase('OverallLiquid').Compounds['Sodium Hydroxide'].MassFraction * 100 # update if (m_fr > 0): # write current value to the flowsheet (kg/m3) flowsheet.WriteMessage('current liquid mixture density value (kg/m3): ' + str(currval))...
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Firstly I updated density of NaOH + H2O mixture using this code [https://dwsim.org/wiki/index.php?title=Overriding_Calculated_Properties] densobj = matstr.GetPhase('OverallLiquid').Properties.density if (densobj <> None): currval = densobj # get massFrac of NaOH m_fr = matstr.GetPhase('OverallLiquid').Compounds['Sodium Hydroxide'].MassFraction * 100 # update if (m_fr > 0): # write current value to the flowsheet (kg/m3) flowsheet.WriteMessage('current liquid mixture density value (kg/m3): ' + str(currval))...
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Firstly I updated density of NaOH + H2O mixture using this code [https://dwsim.org/wiki/index.php?title=Overriding_Calculated_Properties] densobj = matstr.GetPhase('OverallLiquid').Properties.density if (densobj <> None): currval = densobj # get massFrac of NaOH m_fr = matstr.GetPhase('OverallLiquid').Compounds['Sodium Hydroxide'].MassFraction * 100 # update if (m_fr > 0): # write current value to the flowsheet (kg/m3) flowsheet.WriteMessage('current liquid mixture density value (kg/m3): ' + str(currval))...
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I will do that ...can you provide an excample of how to use 'Property override' in this case for Cp
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I am attaching a sim file where specific heats for EG-H2O mixture plays an important role in determing cooling loads. The actual values are 3.7-3.8 for 40% w.t ...but DWSIm puts it at 1.6kJ/kg.K source: https://simulationresearch.lbl.gov/modelica/releases/v9.1.0/help/Buildings_Media_Antifreeze_EthyleneGlycolWater.html
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If there is binary mixture like CaCl2-H2O or NaOH-H2O; I suppose with proper VLE data (can be acquired through NIST) & a very good DWSIM compund creation utility ...I suppose it can done. Ions are a different ball game altogether
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Ah! there was no tutorial so I figured it out myself. To create a User Expression the correct way is to write it like: exp^(A+B/(T+C)+D*Ln(T))
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Ah! there was no tutorial so I fugured it out myself. To create a User Expression the correct way is to write it like: exp^(A+B/(T+C)+D*Ln(T))
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In the compund creation utility, I am having following error Error parsing string for numerical expression: 'Exp(A + B / (T + C) + D * Ln(T))'. Check temperature-dependent property expressions for the selected compounds and try again.
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Units based on different phases can be constructed using spreadsheet. You can import gas & liquid quanities into spreadsheet & apply conversion factors to reach your answer. m3/d > corresponds to process conditions
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I know DWSIM has a powerful sensitivity analysis tool. However sometimes we need an arbitarily chosen mix of variables & its effect upon another variable(s). This can be easily done via Data Recorder of some sort that provides tabulated & graphical results afterwards Daniel your insights (as always) are welcome
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You can create sensitivty analysis & study variable change effects...why create separate files?
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Will get back to you after I learn it myself :)
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Thanks, so is there a tutorial how to build this JSON file, lets say if I want to do that for DOWTHERM oil
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Thanks for replying. Well I am at a beginner level of Python so I will need some coding help. Alternatively I was hoping if I can export a spreadsheet cell (say B1) that has a numerical value of 0.42. Then this can somehow be referred in the equation for the SPECIFICATION Block In the attachment I just want to vary S1 block equation to see the effect of varying amount of WaterVap on the Cooler (UO name in the attachment) duty in KW. Currently WaterVap.MassFlow = 0.42 * PureCl2.MassFlow ^ this 0.42...
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@ v5.2u14 In the attached picture a SET block is used to mathematically relate flowrates of two different material streams (see the equation). I want to change the multiplying factor (currently 0.42) say from 0.1 - 0.4 in sensitivity analysis. How can I achieve that
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@ v5.2u14 In the attached picture a SET block is used to mathemtically relate flowrates of two different material streams (see the equation). I want to change the multiplying factor (currently 0.42) say from 0.1 - 0.4 in sensitivity analysis. How can I achieve that
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@ v5.2u14 In the attached picture a SET block is used to mathemtically relate flowrates of two different material streams (see the equation). I want to change the multiplying factor (currently 0.42) say from 0.1 - 0.4 in sensitivity analysis. How can I achieve that
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This is an extension to a previous SOLVED question: https://sourceforge.net/p/dwsim/discussion/844528/thread/404daee0/ If I use a different basis at shell side when compared with tube side; will the problem encountered previously will repeat? For instance I want to use NRTL at tube side (for brine) while ASTM Steam at shell side
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Nops not available (in the form attached below) but you can use CHEMSEP UO
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Sorry Daniel, I had tinkered with DPI settings ..sorry problem resolved
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Cannot find the package selection for a material stream? Plus also give me advice of a package selection while dealing with lye systems (such as this)
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I am using Steam-97 basis & the cooler throws a buggy value when outlet vapour fraction is selcted to be 0 (meaning only latent heat is to be extracted); while the same cooler UO calculates OK when cooling condensates (sensible heat is extracted) Apart from sign error the value extracted from 1000kg/hr of steam at 14barg with quality=1 ..is highly under-reported by DWSIM ...other simulators (plus manual check via steam tables) gives a value of 537kW whereas DWSIM 144kW?
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I am using Steam-97 basis & the cooler throws a buggy value when outlet vapour fraction is selcted to be 0 (meaning only latent heat is to be extracted); while the same cooler UO calculates OK when cooling condensates (sensible heat is extracted) Apart from sign error the value extracted from 1000kg/hr of steam at 14barg with quality=1 ..is highly under-reported by DWSIM ...other simulators (plus manual check via steam tables) gives a value of 537kW whereas DWSIM 144kW?
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I am really happy that you are woking on electrolytes. pH calculation should be a priority
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Daniel you don't need one! The previous method (input vol of solvent & moles of solute) was more than suitable (as was in tutorial)
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Daniel, but its very difficult that way. Please provide an easy solution to set molarities (user-friendly manner)
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@Problem/Solution #2 I have mentioned earlier that per instruction its simple but the water (solvent) row is greyed ..how do I edit it. Please check attached video (generated by ffmpeg)
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@Problem/Solution #1 I have mentioned earlier that per instruction its simple but the water (solvent) row is greyed ..how do I edit it. Please check attached video (generated by ffmpeg)
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@ http://dwsim.inforside.com.br/wiki/index.php?title=Setting_up_an_Electrolyte_Simulation As per above tutorial I cannot find x2 things in latest versions 1] How do I import reaction set located in \Program Files (x86)\DWSIM5\data\reactions\Water Self-Ionization.dwrxm 2] I cannot undertsand how to reproduce For the molarity option, Water amount is entered in liters, while the salt and ion amounts should be entered in mols. For the first I can manually initiate & type whole of equilibrium rxn data...
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@ http://dwsim.inforside.com.br/wiki/index.php?title=Setting_up_an_Electrolyte_Simulation As per above tutorial I cannot find x2 things in latest versions 1] How do I import reaction set located in \Program Files (x86)\DWSIM5\data\reactions\Water Self-Ionization.dwrxm 2] I cannot undertsand how to reproduce *For the molarity option, Water amount is entered in liters, while the salt and ion amounts should be entered in mols. * For the first I can manually initiate & type whole of equilibrium rxn data...
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@ http://dwsim.inforside.com.br/wiki/index.php?title=Setting_up_an_Electrolyte_Simulation As per above tutorial I cannot find x2 things in latest versions 1] How do I import reaction set located in \Program Files (x86)\DWSIM5\data\reactions\Water Self-Ionization.dwrxm 2] I cannot undertsand how to reproduce *For the molarity option, Water amount is entered in liters, while the salt and ion amounts should be entered in mols. * For the first I can manually initiate & type whole of equilibrium rxn data...
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@ http://dwsim.inforside.com.br/wiki/index.php?title=Setting_up_an_Electrolyte_Simulation As per above tutorial I cannot find x2 tings in latest versions 1] How do I import reaction set located in \Program Files (x86)\DWSIM5\data\reactions\Water Self-Ionization.dwrxm 2] I cannot undertsand how to reproduce *For the molarity option, Water amount is entered in liters, while the salt and ion amounts should be entered in mols. * For the first I can manually initiate & type whole of equilibrium rxn data...
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@ http://dwsim.inforside.com.br/wiki/index.php?title=Setting_up_an_Electrolyte_Simulation As per above tutorial I cannot find x2 tings in latest versions 1] How do I import reaction set located in \Program Files (x86)\DWSIM5\data\reactions\Water Self-Ionization.dwrxm 2] I cannot undertsand how to reproduce *For the molarity option, Water amount is entered in liters, while the salt and ion amounts should be entered in mols. * For the first I can manually initiate & type whole of equilibrium rxn data...
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Problem Solved & features added in update 10. Thanks author
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@ Win10x64 DWSIM v5u8 (latest till date) When using Adjuster I have to be very vigilant about the units for Manipulated variable. While in flowsheet the user has selected MassFlow units in kg/hr Adjuster always uses SI units (kg/sec) WITHOUT even notifying user. When using Brent method this very problem arises. Difficulty further arises when we are dealing -ive pressures & Adjuster use Pa! I also request that in the result table for Adjuster please add the column for instant value of Manipulated...
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@ Win10x64 DWSIM v5u8 (latest till date) When using Adjuster I have to be very vigilant about the units for Manipulated variable. While in flowsheet the user has selected MassFlow units in kg/hr Adjuster always uses SI units (kg/sec) WITHOUT even notifying user. When using Brent method this very problem arises. Difficulty further arises when we are dealing -ive pressures & Adjuster use Pa! I also request that in the result table for Adjuster please add the column for instant value of Manipulated...
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Marta it seems you are dealing with Absorption Chillers (preheaters) ! Don't use S&T plainly in this case. Almost all chillers employ P&F HXchangers or spiral tubes (if S&T)
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Here is the attachment
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When I change the split of component splitter via an Adjust ControlBlock ...& define upper/lower limits in say kg/hr. Then I start sensitivity analysis & the change in the split is occuring in kg/s & it also gives erratic results
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Daniel if your time does allow you please do attach a python script & if it can be done via VBA (a sample will suffice) I would stop bothering you :)
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No there isn't ...however if you can attach a sketch of your system we will be in a better position to help you
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I think the answers for KPIs (key process parameters) for a combustion cycle are thoroughly discussed in Thermodynamic books (Cengel Boles for instance), you can start from there & then buid your model. DWSIM is is indeed capable!
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Download the case
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In the attached sim file I am accessing wet Cl2 streams cooling loads: case A where it has no O2 & case B where it has 0.05 (mole fraction) O2. All other conditions are same because case A was copied to produce case B. I cannot infer the results & require someone to look at the cooler load (in KW) because they seem highly influenced with minor O2 in material stream to cooler! I have checked Cp values & density values ....they don't differ much My 2nd query is that dewpoint temperature of material...
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Whenever dealing with Separator UO ...its better to check Q (in/out) value. For your 3rd case override Q value ESTR-004 to zero & then solve
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Weird! I am reproducing the same problem. Juan, however, if you look at the popup menu of energy streams for both compressors the power is ~36kW
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they exist! Use adjuster or you can have parametric studies
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Daniel I am sorry but I have given up! I cannot setup a successful NRTL isobaric binary regression b/w H2O & HCl. I know you may be busy man ...but do please help me in getting these NRTL coefficients
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Daniel I am sorry but I have given up! I cannot setup a successful NRTL isobaric binary regression b/w H2O & HCl. I know you may be busy man ...but do please help me in hetting these NRTL coefficients
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I have setup sim where H2/Cl2 burns (Conversion Reactor + reaction + PR package) to produce HCl gas. Now how do I setup an absorber such that whole HCl gets Aqueous? Only 1 page documentation regarding electrolytes is there in DWSIM online help. I have read it but when I add UNIQUAC electrolyte package it somehow interfere with PR package & the outlet temperature of conversion reactor is highly under-estimated? (from 2700C TO 800C)
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Thanks problem resolved with v5.1u9
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this also occurs in HYSYS https://www.cheresources.com/invision/topic/27134-why-hysys-isnt-providing-proper-steam-properties/
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this also occurs in HYSYS https://www.cheresources.com/invision/topic/27134-why-hysys-isnt-providing-proper-steam-properties/#entry111607
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I have setup sim to determine exit velocities of air for changing Pipe Lengths (a system devised to surrogate our air compressor system) Sim Setup (PR + Brills Correlation for pressure drop*): http://www.mediafire.com/view/a3agdnf4kasrah4/Screenshot_2.png# Problem: http://www.mediafire.com/view/mwn75058edd51w5/Screenshot_1.png In the problem image you can see that I cannot access pipe length property for sensitivity analysis. Is there anything to replicate this HYSYS feature: http://www.mediafire.com/file/19h3eivbn1nqg4n/HYSYS_Out.png...
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Problem is RESOLVED . Thanks!
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Thanks for your timely response
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I am afraid Daniel thiugh I do know a lot about EXCEL-VBA ...this seems to be beyond my comprehension
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BTW COCO failed to autocalculate max. extent of RXN2 (whereas DWSIM successfully did that). COCO gave error that O2 has become -ive in outlet so I have to manually reduce 0.6 extent of RXN2 to 0.576. HYSYS represenatation of this extent is different & it also gave me temporary headache :(
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oK Daniel the problem is confirmed to be in DWSIM enthalpy calculation algorithm for reactions. I have reproduced same results as that of HYSYS in COCO as well ....everything same except Temperature https://prntscr.com/hu9iat
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You got everything right! If the 1st rxn achieved 100% extent (that is 40% conversion w.r.t Base component CH4 as defined by user) ...the 2nd rxn doesnt necessarily will achieve 100% extent (that is 60%) WHY ....because the limiting component air (precisely O2) is exhausted
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For some reason the conversion of the remaining amount is reaching 57%, not 60% No ...if you check out HYSYS sim file reaction extent is 37% (that is intentional because air is a limiting factor). That is also the deduction from DWSIM results (the Mole Fraction of outlet vapour stream has ZERO O2)
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For some reason the conversion of the remaining amount is reaching 57%, not 60% No ...if you check out HYSYS sim file reaction extent is 37% (that is intentional because air is a limiting factor). That is also the deduction from DWSIM results (the Mole Fraction of outlet vapour stream has ZERO O2)
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Here are the two cases attached
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It seems that I cannot attach example files in the first post ....There are differences in results from both simulators. The FIRST thing is that "Coonversion Reactor" in HYSYS accepts multiple-inlets while in DWSIM to create a similar effect a mixer at the UPSTREAM of reactor is required. The results shown below has two key differences 1] The extent of the reaction are dfferent 2] Calculated temperature of DWSIM (after reactor) is 94C less than in HYSYS https://prntscr.com/httwbe https://prntscr...
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I have found these two very useful chemical/mechanical engineering python libraries that I believe can make process FLUID calculation breeze in DWSIM. These are 1] https://github.com/CalebBell/fluids http://fluids.readthedocs.io/index.html 2] https://github.com/CalebBell/thermo http://thermo.readthedocs.io/en/latest/ Th 1st one is of particular importance that can turn Dwsim into a fluid simulation package
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Problem was resolved using following steps 1] Create a backup of original DWSIM.exe (in installation folder) 2] Install Resource Hacker™ (RH) 3] Using RH open DWSIM.exe 4] In the right panel expand the section named Manifest 5] There exists one entry named "1 : 0" 6] Now edit true to false in the following line <dpiAware>false</dpiAware> 7] Recompile the DWSIM.exe (in the installation folder) & use this to launch application http://prntscr.com/hqv31a
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@ Win10x64 I have a 12' tablet with 1920/1080 resolution. Problem is I cannot access the regression buttons below https://prntscr.com/hqlhwd
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