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| import clr | |
| from System.IO import Directory, Path, File | |
| from System import String, Double, Array, Reflection, Exception | |
| dtlpath = "C:\\Users\\Daniel\\Source\\Repos\\DanWBR\\dwsim6\\DistPackages\\DTL\\" | |
| clr.AddReference(dtlpath + "DWSIM.Thermodynamics.StandaloneLibrary.dll") | |
| from DWSIM.Thermodynamics import Streams, PropertyPackages, CalculatorInterface | |
| import CapeOpen | |
| dtlc = CalculatorInterface.Calculator() | |
| print(String.Format("DTL version: {0}", Reflection.Assembly.GetAssembly(dtlc.GetType()).GetName().Version)) | |
| print() | |
| dtlc.Initialize() | |
| nrtl = PropertyPackages.NRTLPropertyPackage(True) | |
| dtlc.TransferCompounds(nrtl) | |
| T = 355.0 #K | |
| P = 101325.0 #Pa | |
| compprops = dtlc.GetCompoundConstPropList() | |
| print("Ethanol constant properties:\n") | |
| for prop in compprops: | |
| pval = dtlc.GetCompoundConstProp("Ethanol", prop) | |
| print(prop + "\t" + pval) | |
| print() | |
| compprops = dtlc.GetCompoundPDepPropList() | |
| print() | |
| print("Ethanol pressure-dependent properties at P = " + str(P) + " Pa:\n") | |
| for prop in compprops: | |
| pval = dtlc.GetCompoundPDepProp("Ethanol", prop, P) | |
| print(prop + "\t" + pval) | |
| print() | |
| compprops = dtlc.GetCompoundTDepPropList() | |
| print() | |
| print("Ethanol temperature-dependent properties at T = " + str(T) + " K:\n") | |
| for prop in compprops: | |
| pval = dtlc.GetCompoundTDepProp("Ethanol", prop, T) | |
| print(prop + "\t" + pval) | |
| print() | |
| print() | |
| print("Water/Ethanol Interaction Parameters for NRTL model:") | |
| print() | |
| # uncheck this if you have a CUDA or OpenCL device to use | |
| # dtlc.EnableGPUProcessing() | |
| # dtlc.InitComputeDevice(Cudafy.eLanguage.Cuda, 0) | |
| ip = dtlc.GetInteractionParameterSet("NRTL", "Water", "Ethanol") | |
| print("A12 = " + str(ip.Parameters["A12"]) + " cal/mol") | |
| print("A21 = " + str(ip.Parameters["A21"]) + " cal/mol") | |
| print("alpha = " + str(ip.Parameters["alpha"])) | |
| print("PT Flash of an equimolar mixture of Water and Ethanol at T = " + str(T) + " K and P = " + str(P) + " Pa:" + "\n") | |
| print("Using NRTL model for equilibrim calculations.") | |
| print() | |
| carray = Array[String](["Water", "Ethanol"]) | |
| comparray = Array[Double]([0.5, 0.5]) | |
| result2 = dtlc.PTFlash(nrtl, 0, P, T, carray, comparray) | |
| print() | |
| print("Flash calculation results:") | |
| print() | |
| for i in range(0, result2.GetLength(0)): | |
| if (i == 0): | |
| line = "Phase Name" + "\t" | |
| elif (i == 1): | |
| line = "Phase Mole Fraction in Mixture" + "\t" | |
| elif (i == 2): | |
| line = "Water Mole Fraction in Phase" + "\t" | |
| elif (i == 3): | |
| line = "Ethanol Mole Fraction in Phase" + "\t" | |
| else: | |
| line = "" | |
| for j in range(0, result2.GetLength(1)): | |
| line += str(result2[i, j]) | |
| print(line) | |
| print() | |
| print("Vapor Phase Mixture Properties at T = " + str(T) + " K and P = " + str(P) + " Pa:" + "\n") | |
| vcarray = Array[Double]([float(result2[2, 0]), float(result2[3, 0])]) | |
| compphaseprops = dtlc.GetPropList() | |
| for prop in compphaseprops: | |
| try: | |
| values = dtlc.CalcProp(nrtl, prop, "Mole", "Vapor", carray, T, P, vcarray) | |
| line = "" | |
| for i in range(0, values.Length): | |
| line += str(values[i]) + "\t" | |
| print(prop + "\t" + line) | |
| except CapeOpen.CapeThrmPropertyNotAvailableException as e: | |
| print(prop + "\t" + "Property Not Available") | |
| except CapeOpen.CapeComputationException as e: | |
| print(prop + "\t" + "Error Calculating Property") | |
| except Exception as e: | |
| print(prop + "\t" + e.Message) | |
| print() | |
| print("Liquid Phase Mixture Properties at T = " + str(T) + " K and P = " + str(P) + " Pa:" + "\n") | |
| lcarray = Array[Double]([float(result2[2, 1]), float(result2[3, 1])]) | |
| for prop in compphaseprops: | |
| try: | |
| values = dtlc.CalcProp(nrtl, prop, "Mole", "Liquid", carray, T, P, lcarray) | |
| line = "" | |
| for i in range(0, values.Length): | |
| line += str(values[i]) + "\t" | |
| print(prop + "\t" + line) | |
| except CapeOpen.CapeThrmPropertyNotAvailableException as e: | |
| print(prop + "\t" + "Property Not Available") | |
| except CapeOpen.CapeComputationException as e: | |
| print(prop + "\t" + "Error Calculating Property") | |
| except Exception as e: | |
| print(prop + "\t" + e.Message) |
Thanks Daniel. I will check this and come back to you!
What is: dtlpath = "C:\Users\Daniel\Source\Repos\DanWBR\dwsim6\DistPackages\DTL\"?
Should we set it to point to dwsim6 installation dir?
There is no DistPackages\dtl in my installation folder: D:\DWSIM6
What is: dtlpath = "C:\Users\Daniel\Source\Repos\DanWBR\dwsim6\DistPackages\DTL"?
Should we set it to point to dwsim6 installation dir?There is no DistPackages\dtl in my installation folder: D:\DWSIM6
It is the path to the DTL file in your computer.
So, I have to install Standalone Thermodynamics Library! I have not it on my laptop.
More question: Having Python 3.9 installed + PythonNet (https://pypi.org/project/pythonnet/) should be enough to run the code or I need more tools?
The library is just a single DLL file, no need to install. Just extract to a folder and get the folder path and put it on the script as dtlpath.
Thank you Daniel!
One some instances (choice of Proppack/Flashalg) I get the follwoing exception:
Unhandled Exception: System.DllNotFoundException: Unable to load DLL 'Ipopt39': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
at Cureos.Numerics.Ipopt.FreeIpoptProblem(IntPtr ipopt_problem)
at Cureos.Numerics.Ipopt.Dispose(Boolean disposing) in C:\Users\Daniel\source\repos\DanWBR\dwsim6\DWSIM.Math.DotNumerics\LinearAlgebra\CSLapack\dscal.cs:line 0
at Cureos.Numerics.Ipopt.Finalize() in C:\Users\Daniel\source\repos\DanWBR\dwsim6\DWSIM.Math.DotNumerics\LinearAlgebra\CSLapack\dscal.cs:line 0
Ifs some path to a required DLL hardtyped somewhere?
Forgot to include IPOPT. Download it and put the DLLs on the same folder.
Hi Daniel,
Trying to execute this code I get the following error:
NullReferenceException Traceback (most recent call last)
in
35 print("Ethanol constant properties:\n")
36 for prop in compprops:
---> 37 pval = dtlc.GetCompoundConstProp("Ethanol", prop)
38 print(prop + "\t" + pval)
39
NullReferenceException: Object reference not set to an instance of an object.
at DWSIM.Thermodynamics.Streams.MaterialStream.get_PropertyPackage() in C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.Thermodynamics\MaterialStream\MaterialStream.vb:line 279
at DWSIM.Thermodynamics.Streams.MaterialStream.GetCompoundConstant(Object props, Object compIds) in C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.Thermodynamics\MaterialStream\MaterialStream.vb:line 4233
at DWSIM.Thermodynamics.CalculatorInterface.Calculator.GetCompoundConstProp(String compound, String prop) in C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.Thermodynamics\Interfaces\Thermodynamics.vb:line 541
Any idea on what might be causing it?
Dear Sir, have you resolved this issue? @lnix05
Output: