IronPython Script Snippets

Create, connect and manipulate objects

Assuming that you're running a simulation with defined compound(s) and property package(s), this will create and connect a cooler and its connections:

import clr
clr.AddReference('DWSIM.Interfaces')

from DWSIM import Interfaces

cooler = Flowsheet.AddObject(Interfaces.Enums.GraphicObjects.ObjectType.Cooler, 100, 100, 'COOLER-001')
heat_out = Flowsheet.AddObject(Interfaces.Enums.GraphicObjects.ObjectType.EnergyStream, 130, 150, 'HEAT_OUT')
inlet = Flowsheet.AddObject(Interfaces.Enums.GraphicObjects.ObjectType.MaterialStream, 50, 100, 'INLET')
outlet = Flowsheet.AddObject(Interfaces.Enums.GraphicObjects.ObjectType.MaterialStream, 150, 100, 'OUTLET')

cooler.GraphicObject.CreateConnectors(1, 1)
inlet.GraphicObject.CreateConnectors(1, 1)
outlet.GraphicObject.CreateConnectors(1, 1)
heat_out.GraphicObject.CreateConnectors(1, 1)

Flowsheet.ConnectObjects(inlet.GraphicObject, cooler.GraphicObject, 0, 0)
Flowsheet.ConnectObjects(cooler.GraphicObject, outlet.GraphicObject, 0, 0)
Flowsheet.ConnectObjects(cooler.GraphicObject, heat_out.GraphicObject, 0, 0)


inlet_properties = inlet.GetPhase('Overall').Properties

inlet_properties.temperature = 400 # K
inlet_properties.pressure = 1000000 # Pa
inlet_properties.massflow = 30 # kg/s

# the following will define all compound mole fractions to the same value so the sum is equal to 1
inlet.EqualizeOverallComposition()

# set the cooler's outlet temperature to 300 K
# http://dwsim.inforside.com.br/api_help57/html/T_DWSIM_UnitOperations_UnitOperations_Cooler.htm
cooler.OutletTemperature = 300

# set the cooler's calculation mode to 'outlet temperature'
# http://dwsim.inforside.com.br/api_help57/html/T_DWSIM_UnitOperations_UnitOperations_Cooler_CalculationMode.htm

clr.AddReference('DWSIM.UnitOperations')
from DWSIM import UnitOperations
cooler.CalcMode = UnitOperations.UnitOperations.Cooler.CalculationMode.OutletTemperature

#calculate the flowsheet
Flowsheet.RequestCalculation(None, False)

#get the outlet stream temperature and cooler's temperature decrease
deltat = cooler.DeltaT
heat_flow = heat_out.EnergyFlow

print('Cooler Temperature Drop (K):'+ str(deltat))
print('Heat Flow (kW): ' + str(heat_flow))

Getting a reference to a Compound in the simulation

mycompound = Flowsheet.SelectedCompounds['Methane']

mycompound2 = Flowsheet.GetSimulationObject['MSTR-001'].Phases[0].Compounds['Methane']

mycompound and mycompound2 are referencing the same object in memory.

Executing a script from another tab/section

import clr
import System
from System import *

clr.AddReference('System.Core')
clr.ImportExtensions(System.Linq)

# get the script text from "Functions" using LINQ
source = Flowsheet.Scripts.Values.Where(lambda x: x.Title == 'Functions').FirstOrDefault().ScriptText.replace('\r', '')

# execute the script
exec(source)

Setting the properties of a Material Stream

ms1 = Flowsheet.GetFlowsheetSimulationObject('MSTR-001')

overall = ms1.GetPhase('Overall')
overall.Properties.temperature = 200 # set temperature to 200 K
overall.Properties.pressure = 101325 # set pressure to 101325 Pa
overall.Properties.massflow = 14 # set mass flow to 14 kg/s

Getting Surface Tension and Diffusion Coefficients from a Material Stream

import clr
import System

# get feed's interfacial tension - method 1

mixphase = feed.GetPhase("Mixture")

sftens = mixphase.Properties.surfaceTension

print str(sftens) + " N/m"

# get feed's interfacial tension - method 2

sftens2 = clr.Reference[System.Object]()

feed.GetTwoPhaseProp("surfacetension", None, "", sftens2)

print str(sftens2.Value[0]) + " N/m"

# diffusion coefficients

phase = feed.GetPhase("Vapor")

compound = phase.Compounds["Methane"]

difc = compound.DiffusionCoefficient

print str(difc) + " m2/s"

Other Snippets

For more code snippets, go to https://sourceforge.net/p/dwsim/discussion/scripting/.