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DWSIM - Open Source Process Simulator
Version 3.4, Build 5608 - May 2015
Copyright (c) Daniel Medeiros, Gregor Reichert, Gustavo León
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DWSIM is a software for modeling, simulation and optimization of steady-state chemical processes.

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DISCLAIMER
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The data and information within DWSIM has been obtained from a wide variety of literature sources.  While reasonable care has been exercised in the collection of data and testing of this software, the author of DWSIM disclaims any warranty, expressed or implied, as to the accuracy or reliability of the data or calculations contained therein. The results of calculations obtained from DWSIM yield approximate results, which will not always be suitable for every application.

The software is designed for use by trained professional personnel and is not a substitute for sound professional judgment.  It is the sole responsibility of the user to validate the data presented by DWSIM and to determine whether the results of this program are accurate and suitable for any specific purpose.  No guarantee of accuracy or fitness for any purpose is expressed or implied.  The author strongly recommends that the data be checked against other sources and/or methods before use and application.  The author shall not be held liable for any direct, indirect, consequential or incidental damages incurred through use of the data or calculations. 

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LICENSE
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DWSIM is licensed under the GNU General Public License (GPL) Version 3.
 
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SOFTWARE/SYSTEM REQUIREMENTS
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OS: 	Windows XP/2000/Vista/7/8
Software: 	.NET Framework 4.0 / Mono 2.10 or newer
CPU: 	1.6 GHz single-core processor (minimum)
GPU (optional): 	CUDA 1.3+ or OpenCL 1.1-enabled device
Memory: 	1 GB RAM
HD space: 	200 MB for program files.
Display: 	A 1024x768 display resolution is recommended as a minimum.

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USAGE INFO (LINUX / OS X)
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** Linux

To run DWSIM on Linux, open a terminal (console) window, point it to the folder which contains the DWSIM executable and execute the following command:

mono DWSIM.exe

To run in debug mode, include the '--debug' switch (when you encounter an unhandled exception, debug mode will include information about the source code file and line number where the exception was raised - helps to track bugs):

mono --debug DWSIM.exe

In order to use the PC-SAFT Property Package, the Gibbs Reactor and the IPOPT solver, you'll need to copy the corresponding native libraries to your 'lib' folder (you'll need to do this only once) and rename 2 files in the DWSIM directory:

sudo cp sharedobjects\liblpsolve55.so /usr/lib/
sudo cp sharedobjects\libPC_SAFT_PROP.so /usr/lib/
sudo cp sharedobjects\libfprops_ascend.so /usr/lib/
sudo tar -C /usr/lib -zxvf sharedobjects\libipopt_mono_dwsim_ubuntu_11.10_32.tar.gz

mv DWSIM.exe.config.linux DWSIM.exe.config
mv Cureos.Numerics.dll.config.linux Cureos.Numerics.dll.config

On Linux machines, Mono can locate these libraries on the DWSIM folder, so you don't need to copy them.

** OS X

Important: Mono requires the X11 package installed on OS X in order to run Windows Forms applications, including DWSIM. Be sure to have it installed before doing the steps below.

Due to a bug in the libgdiplus library in OS X, DWSIM will work only with a specific Mono 2.10 build, which can be found here => https://bugzilla.xamarin.com/show_bug.cgi?id=2474

To run DWSIM on OS X, open a terminal (console) window (Go > Utilities > Terminal), point it to the folder which contains the DWSIM executable and execute the following commands:

export MONO_MWF_MAC_FORCE_X11=1
mono DWSIM.exe

To run in debug mode, include the '--debug' switch (when you encounter an unhandled exception, debug mode will include information about the source code file and line number where the exception was raised - helps to track bugs):

mono --debug DWSIM.exe

In order to use the PC-SAFT Property Package, the Gibbs Reactor and the IPOPT solver, you'll need to copy the corresponding native libraries to your 'lib' folder (you'll need to do this only once) and rename 2 files in the DWSIM directory:

sudo cp dynamiclibraries\liblpsolve55.dylib /usr/lib/
sudo cp dynamiclibraries\libgfortran.3.dylib /usr/lib/
sudo cp dynamiclibraries\libPC_SAFT_PROP.dylib /usr/lib/
sudo cp dynamiclibraries\libfprops_ascend.dylib /usr/lib/
sudo unzip dynamiclibraries\libipopt_mono_dwsim_osx_10.7.3_32.zip -d /usr/lib

mv DWSIM.exe.config.osx DWSIM.exe.config
mv Cureos.Numerics.dll.config.osx Cureos.Numerics.dll.config

Finally, if you didn't do this already, copy the file "default.ini" and rename the copied file to "dwsim.ini" to have your settings saved between sessions. 

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KNOWN ISSUES
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Known limitations of DWSIM when running on Mono:

- Report Tool doesn't work. When the user clicks on the button to generate a report preview, a blank page appears;
- DataGrids don't display tooltips, this is a Mono limitation, not DWSIM's.

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VERSION HISTORY / CHANGELOG
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The full changelog, including code changes and their authors can be viewed at https://github.com/DanWBR/dwsim3/commits/master

Version 3.4 Build 5608

- [NEW] NIST-MODFAC Property Package (http://trc.nist.gov/TDE/Help/TDE103b/NIST-Modified-UNIFAC-AC-Model.htm)
- [NEW] Model Comparison in Binary Enevelope Utility
- [NEW] New Flowsheet Solver modes
- [NEW] Linked Spreadsheet Table
- [NEW] Activate/Deactivate Flowsheet Objects
- [NEW] Added Input and Output Variables to Custom (Script) Unit Operation
- [NEW] Restore previous successful flowsheet solutions
- [NEW] Equilibrium calculations now use Henry coefficients for non-condensables 
- [NEW] Added support for CAPE-OPEN Array Parameter type
- [NEW] Mouse double-click now opens specific windows for some unit operations
- [NEW] Added window docking menu for Mono compatibility
- [NEW] Export simulation compounds to XML user database
- [CHG] Excel UO is now Spreadsheet UO, supports ODS files and runs on Linux
- [CHG] Speed enhancements for calculations with UNIFAC-type Property Packages
- [CHG] Flash Algorithm "Fast" option is now a Property Package parameter
- [CHG] Changed Flowsheet UO subflowsheet display mode to dockable
- [CHG] Parallelized phase identification routine loop
- [CHG] Optimized Recycle code
- [CHG] Improved Lee-Kesler root finding
- [CHG] New object palette icons
- [FIX] Corrected some Hydrate calculation models
- [FIX] Fixed GPU multithreading lockups
- [FIX] Fixed Sum Rates Absorption Column solver
- [FIX] Minor bug fixes and enhancements

Version 3.3 Build 5517

- [NEW] Flowsheet Unit Operation
- [NEW] Redesigned Nested Loops VLLE flash algorithm
- [NEW] Fast/Rigorous option mode for Nested Loops VLE flash algorithm
- [NEW] Timed simulation script events
- [NEW] Updated Plugin Interface (IUtilityPlugin2), includes new generic function which can be called by scripts
- [CHG] Updated/Redesigned CoolProp interface
- [CHG] Autosave scripts when saving flowsheet
- [FIX] Fixed Heat of Vaporization calculation for ChemSep compounds
- [FIX] Fixed bugs in the PSV sizing utility
- [FIX] General bug fixes and code optimizations

Version 3.3 Build 5488

- [NEW] Excel Unit Operation
- [NEW] IronPython Script Manager
- [CHG] Flowsheet drawing optimizations
- [CHG] Added Energy Stream requirement to Vessel UO to maintain energy balance consistency
- [CHG] Added a confirmation message to add units systems from simulation files
- [CHG] Sensitivity Analysis Utility GUI adjustments
- [CHG] CAPE-OPEN Property Package adjustments
- [CHG] Added Material Stream's phase mole flow information to property grid
- [FIX] (T)xy, (P)xy binary diagram fixes
- [FIX] Fixed Command Line mode issues
- [FIX] Fixed bugs in the Compound Creator utility
- [FIX] Fixed Rigorous Column stage naming
- [FIX] Fixed proxy settings for new version check
- [FIX] Fixed isolated Material Stream not calculating with "Calculate All" command
- [FIX] Minor bug fixes

Version 3.2 Build 5398

- [CHG] Cleaned exception information in log window
- [FIX] General fixes to Parallel CPU/GPU calculations
- [FIX] General fixes and stability enhancements to Three-Phase Flash Algorithms
- [FIX] Fixed Interaction Parameter XML restoring bug
- [FIX] Fixed Recycle Op not updating mole flows
- [FIX] Fixed a report display bug in CAPE-OPEN Unit Operation

Version 3.2 Build 5390

- [NEW] Triangular LLE Phase Envelope Utility
- [NEW] User Compound Database Management Tool
- [NEW] Material Stream data copy through the PFD context menu
- [NEW] Added Enthalpy/Entropy/Cp calculation method selection to Activity Coefficient-based Property Packages.
- [NEW] Added support for hydrate calculations in equilibrium with gas phase only
- [NEW] New interpolation methods for distillation column initial estimates of temperature, vapor and liquid flows
- [CHG] Pure Component Property Viewer improvements
- [CHG] Updates to Help system
- [CHG] Updates to stability tests on three-phase flash algorithms
- [FIX] Implemented missing methods for XML saving/loading of Watch Items
- [FIX] Fixed bugs in the Electrolytes subsystem
- [FIX] Gibbs Reactor model fixes
- [FIX] Minor bug fixes and UI tweaks

Version 3.2 Build 5349

- [NEW] Implemented Pressure-Enthalpy (PH) and Pressure-Vapor Fraction (PVF) Flash algorithms for Electrolyte Property Packages
- [NEW] Added an option to restore Material Streams' default properties
- [NEW] Added "Ignore Vapor Phase" property to the Tank Unit Op
- [CHG] Changed Units System persistence to XML format
- [CHG] Updated calculation procedures in the Petroleum Cold Flow Properties utility
- [CHG] Steam Tables Property Package now works with Water compound from ChemSep database
- [FIX] Restored table property values after loading simulation from a XML file
- [FIX] Minor bug fixes

Version 3.2 Build 5309

- [NEW] Added hydrate calculation method option to the phase envelope utility
- [CHG] Enhanced hydrate models to correctly support hydrocarbons that don't form hydrates

Version 3.2 Build 5296

- [NEW] New Phase Identification Algorithm based on the work of Venkatarathnam et al (http://dx.doi.org/10.1016/j.fluid.2010.12.001)
- [NEW] Enhanced Phase Envelope Utility now shows hydrate curves, dry-basis dew points for wet natural gas mixtures and phase identification boundary for PR and SRK EOS
- [NEW] Added Motor Octane Number (MON) and Methane Number (MN) properties to the Natural Gas Properties Plugin
- [NEW] New flash calculation spec added to the Separator Vessel model
- [CHG] Enhanced NRTL/UNIQUAC interaction parameter estimation procedures, can now estimate temperature dependency
- [CHG] Enhanced flash algorithm initialization
- [CHG] All three-phase flash algorithms now calculate true tree-phase saturation points if required
- [CHG] Enhanced Hydrate Formation Utility with faster calculation times and ChemSep compound support
- [CHG] Updated UNIFAC/MODFAC Property Packages' configuration dialog with UNIFAC group information
- [FIX] Fixed reporting tool
- [FIX] Minor bug fixes

Version 3.1 Build 5265

- [FIX] Mono Runtime compatibility fixes
- [FIX] Fixed Spreadsheet bugs
- [FIX] Fixed bugs in the Adjust and Set logical operations
- [FIX] Fixed PV/TV Flash temperature search limits
- [FIX] Fix for sensitivity analysis window resizing
- [CHG] Updated quickview table
- [CHG] Fixed zoom level of the quickview table at 100%

Version 3.1 Beta Build 5259

- [NEW] Rewritten flowsheet solver for faster calculation times and recycle optimization
- [NEW] CoolProp Property Package (www.coolprop.org)
- [NEW] Simulation Configuration Wizard
- [CHG] Redesigned Online Help file
- [CHG] Activity Coefficient-based Property Packages now default to Ideal Vapor Phase modeling
- [CHG] Properties like Viscosity, Thermal Conductivity and Surface Tension are now calculated using experimental data whenever available
- [CHG] Enhanced Pure Compound Property Viewer to show all T-dependent properties
- [FIX] Restored compatibility with pre-3.0 binary format simulation files (*.dwsim)
- [FIX] Small interface updates and general bug fixes

Version 3.0 Build 5212

- [FIX] Fixed Material Stream molar/volumetric flow input through the Property Grid.

Version 3.0 Build 5209

- [FIX] Fixed ratios not being set in the Splitter Op.
- [FIX] Fixed a small bug in Gibbs PH flash calculation.

Version 3.0 Build 5206

- [NEW] New Nested-Loops Three-Phase algorithm
- [FIX] Various fixes and stability/reliability enhancements for the flash algorithms
- [FIX] Minor bug fixes.

Version 3.0 Build 5162

- [NEW] Added a new "Stream Flow Spec" operation mode for the Splitter Unit Operation.
- [CHG] Workaround for CAPE-OPEN terminate call error during flowsheet close event.
- [CHG] Updated Cudafy.NET.dll to v1.26, compiling CUDA code with CUDA SDK 5.5 and Visual C++ 2012 Express.
- [CHG] Added a trivial solution check to the Gibbs PT flash algorithm.
- [FIX] Fix for zeroing mass and mole flow through CAPE-OPEN calls.
- [FIX] Workaround for Gibbs PT-Flash algorithm reaching maximum number of iterations (happens on single phase regions).
- [FIX] Fixed XML serialization of Double and Single data types.
- [FIX] Minor bug fixes.

Version 3.0 Build 5154

- [NEW] Excel Interface: added functions to return interaction parameters stored in DWSIM for a given binary / model.
- [NEW] Excel Interface: saving and reading settings to/from INI file (stored in "My Documents\DWSIM Application Data") for improved compatibility.
- [FIX] Inside-Out Flash: fixed resulting vapor composition in three-phase PT-Flash.
- [FIX] Separator Vessel: fixed equilibrium calculation for a single compound mixture.
- [FIX] Flowsheet Solver: fixed flash calculation for single compound not following the defined specification.
- [FIX] Fixed equilibrium calculation routines to handle single-compound streams.
- [FIX] Exposing more temperature-dependent pure compound properties through Excel and CAPE-OPEN interfaces.
- [FIX] Excel Interface: Added a function to return compound constants as loaded from the database files.
- [FIX] Fixed a small bug in mixture vapor pressure calculation.
- [FIX] UNIQUAC model: fixed infinite dilution activity coefficient calculation.
- [FIX] Data Regression utility: fixed images not showing in database management buttons.

Version 3.0 Build 5145

- [CHG] Changed the XML simulation loading code, now keeps loading information even if it finds errors in the XML structure
- [CHG] Changed ChemSep database initial directory setting for Excel compatibility if it doesn't find it through registry (defaults to [dwsim]\chemsepdb\chemsep1.xml)
- [FIX] Fixed XML loading of Sensitivity Analysis and Optimization Cases

Version 3.0 Build 5142

- [NEW] User Interaction Parameter database system for NRTL and UNIQUAC models (work in progress)
- [CHG] Compounds and Property Packages can now be added with a double mouse click
- [FIX] Fixed bug #13: Steam Tables - gas-liquid equilibrium in adibatic expander (https://sourceforge.net/apps/mantisbt/dwsim/view.php?id=13)
- [FIX] Fixed bug #14: Sensitivity Analysis Definition cannot be saved (https://sourceforge.net/apps/mantisbt/dwsim/view.php?id=14)
- [FIX] Fixes to the CAPE-OPEN subsystem
- [FIX] Fixed validation of PT-flash calculations
- [FIX] Fixed a bug in the PH-Flash calculation with Gibbs 3P algorithm
- [FIX] Fixed mixing rule for liquid density
- [FIX] Fixed some bugs in the Shortcut Column model
- [FIX] Binary Envelope - y axis scale adjusted to x axis in Txy and Pxy diagrams

Version 3.0 Build 5114

- [NEW] Temperature-dependent VLE/LLE regression for NRTL/UNIQUAC interaction parameters
- [NEW] Excel Interface: created new functions that accept an initial estimate for temperature and pressure calculations
- [CHG] Users can now specify the gibbs energy delta tolerance for validation of flash calculation results
- [CHG] Welcome Screen: Button "Samples" opens a dialog with samples directory selected instead of displaying samples directory.
- [CHG] Enhanced stability of the three-phase Gibbs Minimization flash algorithm
- [FIX] Fixed enthalpy and entropy calculation through Excel interface
- [FIX] Fixed CSTR and Shortcut Column models
- [FIX] Minor bug fixes and enhancements

Version 3.0 Build 5065

- [CHG] Exposed more properties of the Distillation Column to Adjust, Set, Report and Optimization tools
- [FIX] Fixed Excel Thermo Interface
- [FIX] Fixed Material Stream cleaning through CAPE-OPEN commands
- [FIX] Fixed inverted sign on Russell's IO duties results
- [FIX] Fixed stage efficiency on Russell's IO solver
- [FIX] Fixed some Spanish translations
- [FIX] Fixed XML loading of Pipe, Shortcut Column and Master Property Table

Version 3.0 Build 5031

- [NEW] Added Aqueous Electrolyte systems simulation support with two new Property Packages: LIQUAC* and Extended UNIQUAC
- [NEW] New Unit Operations for Solid-handling simulations: Solids Separator and Continuous Cake Filter
- [NEW] Unified code base and single executable for .NET/Mono, compiled for CLR v4.0
- [NEW] New XML simulation file format for full compatibility between platforms (Windows/Linux/OS X)
- [NEW] New Parallel Calculations engine with support for multicore CPUs and CUDA/OpenCL-capable GPUs
- [NEW] 'Copy Data to Clipboard' function added to flowsheet objects
- [CHG] Stability enhancements to Rigorous Column model and Boston-Britt Inside-Out solver
- [CHG] Report tool now fully supports Excel Spreadsheet file format
- [CHG] Added more material stream composition input options: Mass/Mole Flows, Standard Liquid Volumetric Fractions, Molarity and Molality (for electrolyte simulations)
- [CHG] Mixer and Separator Vessel models now supports up to six inlet streams
- [CHG] NRTL/UNIQUAC Interaction Parameters are now temperature-dependent
- [CHG] All Activity coefficient models now include an option to model the Vapor Phase as ideal. The Data Regression utility also supports this option in order to regress data to find the interaction parameters accordingly
- [CHG] The Compound Creator was enhanced to include more Joback/UNIFAC groups, Element information and Solid Phase properties estimation, including temperature-dependent ones (Cp, Density). The regression graphs now show calculated properties for every temperature dependent property
- [CHG] Phase Envelope utilities now have cancellation support
- [CHG] The Binary Envelope Utility was enhanced to show every kind of equilibrium line supported by DWSIM (VLE, LLE, SLE and Critical)
- [CHG] The Data Regression utility now supports fixing some interaction parameters, enhanced LLE /SLE regression
- [CHG] The Pure Compound Property viewer now includes molecular properties, solid properties and property tables
- [FIX] Lots of bug fixes and minor enhancements

Version 2.1 Build 4819

- [FIX] Fixed empty property grid after adding an object to the flowsheet
- [FIX] Fixed Binary Envelope utility "index out of bounds" error
- [FIX] Fixed unit system not being updated after loading from file
- [FIX] Fixed NRTL parameter estimation in the Data Regression utility
- [FIX] Fixed vapor pressure parameters not being saved in the Compound Creator
- [FIX] Fixed NRTL/UNIQUAC parameter estimation between compounds from mixed databases
- [FIX] Fixed boiling point calculation instability in the Binary Envelope utility when two liquid phases are present
- [FIX] Fixed key compound list for instability test not being updated after adding/removing a compound from the simulation
- [FIX] Fixed object property sorting in the Sensitivity Analysis utility
- [FIX] Fixed German translation for the "Advanced" section in Thermodynamics config screen 
- [FIX] Fixed Critical Temperature calculation in the Compound Creator when Normal Boiling Point isn't selected to be calculated by UNIFAC/Joback
- [FIX] Fixed Adjust error function units
- [CHG] Phase Envelope utility is now set to show all calculated points even when an error occurs
- [CHG] Saved file name is now displayed in the window title for Regression and Compound Creator cases

Version 2.1 Build 4768

- [CHG] Various enhancements added to the Binary Envelope utility

Version 2.1 Build 4767

- [CHG] New Material Streams are now added to the flowsheet at standard conditions (25 C, 1 atm, 1 kg/s)
- [CHG] Enhanced stability of the Three-Phase Flash algorithms when there is no vapor phase
- [CHG] More stable NRTL parameter estimation through UNIFAC (fixed alpha12 at 0.3)
- [FIX] Fixed flowsheet page setup for printing
- [FIX] Fixed system of units saving and loading on German and Spanish GUI languages

Version 2.1 Build 4764

- [NEW] Added user-defined units and other minor enhancements/bug fixes to the Compound Creator
- [CHG] Added a message box to warn the user when NRTL/UNIQUAC parameter estimation with UNIFAC method fails
- [CHG] Added an error message to the Information Window when Bubble/Dew point calculation fails
- [FIX] DWSIM now throws an exception when an UNIFAC interaction parameter is not found for a binary during an activity coefficient calculation
- [FIX] Fixed Master Table property list when changing locale setting
- [FIX] Fixed Material Stream's compound mass and mole flow units when displayed on tables and reports

Version 2.1 Build 4762

- [CHG] Added UNIQUAC parameter input to the Compound Creator
- [CHG] Added data point information to the Compound Creator regression viewer
- [FIX] Fixed Compound Creator filename and checkbox persistence

Version 2.1 Build 4761

- [CHG] Enhanced Compound Creator with UNIFAC group pictures and the ability to enter equation coefficients for temperature-dependent properties.
- [CHG] Updated UNIFAC groups and interaction parameters with data from http://www.aim.env.uea.ac.uk/aim/info/UNIFACgroups.html
- [FIX] Fixed CSTR/PFR models

Version 2.1 Build 4753

- [NEW] Added support for multiple dependent variables to the Sensitivity Analysis utility
- [FIX] Fixed Rigorous Column outlet streams' compound mass fractions
- [FIX] Fixed single-compound inlet stream calculation error
- [FIX] Fixed Sensitivity Analysis flowsheet restoring

Version 2.1 Build 4715

- [NEW] Added German translation for the Compound Creator utility (by Gregor Reichert) 
- [FIX] Fixed Material Stream specification not being honored when changing mixture composition
- [FIX] Fixed Pipe Hydraulic Editor form resizing and length/diameter units
- [FIX] Fixed ChemSep database loading in CAPE-OPEN mode
- [FIX] Fixed Data Regression utility
- [FIX] Fixed Heater/Cooler outlet temperature specification bug

Version 2.1 Build 4698

- [CHG] Enhanced Element Matrix and Initial Estimates editor for the Gibbs Reactor

Version 2.1 Build 4680

- [NEW] Save selected object properties to text file
- [FIX] Fixed PFR, CSTR and Pump models
- [FIX] Fixed instability on the Nested Loop PH Flash code
- [FIX] Fixed pressure unit conversion from barg to Pa

Version 2.1 Build 4606

- [CHG] COSMO-SAC database loading is now done only on-demand instead of during startup
- [CHG] Petalas-Aziz pressure drop model now uses a native library by the authors

Version 2.1 Build 4605

- [NEW] Simultaneous Adjust Solver
- [NEW] Added the option to edit pure compound properties through the Pure Compound Properties utility
- [NEW] Added automatic calculation of PR and SRK Peneloux volume translation (shift) coefficients for pseudocomponents
- [FIX] Several fixes to the Pipe Segment (and pressure drop) model, includes Joule-Thomson cooling option
- [FIX] Fixed drawing of Adjust's line connectors

Version 2.1 Build 4602

- [NEW] Added Peneloux volume translation support for PR and SRK Property Packages (Configure Property Package > General Options > Use Peneloux Volume translation => set to 1)
- [FIX] Fixed material stream composition editing in commmand line mode
- [FIX] Fixed ambient temperature not being set on Thermal Profile Editor (Pipe Segment)

Version 2.1 Build 4589

- [CHG] Enabled calculation of material streams when there is no mass/mole flow
- [FIX] Fixed mixer calculation when some of the inlet streams have no flow
- [FIX] Fixed a bug with the mass balance in the gas-liquid separator

Version 2.1 Build 4569

- [NEW] Save/Restore simulation states
- [NEW] Capture flowsheet snapshot and send to clipboard
- [FIX] Fixed command line run mode
- [FIX] Fixed heat capacity coefficients generated by the Compound Creator
- [FIX] Minor fixes to petroleum charact. utilities

Version 2.1 Build 4534

- [FIX] More fixes and enhancements to the flash algorithms
- [FIX] Fixed a bug in the excel interface
- [NEW] Added "reset settings" functionality by pressing Shift during startup

Version 2.1 Build 4526

- [NEW] Added Lua scripting support
- [FIX] Further fixes and improvements to the flash algorithms
- [FIX] Fixed ChemSep column operation with pseudocomponents/hypotheticals
- [FIX] Fixed Zc/Vc calculation for pseudocomponents
- [FIX] Fixed some bugs in the CAPE-OPEN Thermo interfaces

Version 2.1 Build 4513

- [FIX] Enhanced stability and reliability for Pressure-Enthalpy flash calculations

Version 2.1 Build 4503

- [NEW] FPROPS Property Package (needs testing)
- [NEW] Gibbs Minimization (experimental stage!), Hybrid Nested Loops / Inside Out flash algorithms
- [NEW] Added convergence information (error value, time taken and iteration count) for all flash algorithms
- [FIX] Fixed IO PH/PS flash calculation for single compounds
- [FIX] Fixed Property Grid issues with some unit operations and Spanish language
- [FIX] Fixed a bug with energy stream connection to rigorous columns

Version 2.1 Build 4466

- [NEW] Added custom object ordering feature to the Master Table
- [NEW] Added more mole flow units of measure
- [NEW] Added the possibility of removing multiple compounds from the simulation at once
- [FIX] Fixed ChemSep database registry search
- [FIX] Minor translation fixes

Version 2.1 Build 4463

- [FIX] Fixed calculation of ideal gas heat capacity for petroleum fractions

Version 2.1 Build 4452

- [NEW] Petroleum Assay Manager (store/reload/import/export bulk and distillation characterization assay data)
- [NEW] Master Property Table object ordering by property or name ascending/descending
- [NEW] PFD Zoom All, Pan (Shift + Left mouse button)
- [NEW] Area unit conversion to the Heat Exchanger
- [FIX] Fixed PFD Select and Center Object

Version 2.1 Build 4442

- [NEW] Added the Master Property Table to display grouped properties from objects of the same type
- [NEW] Added save-to-image flowsheet feature
- [NEW] Added bubble and dew points to Material Stream's property list
- [NEW] Added the capability of editing custom system of units
- [NEW] Added a keyboard shortcut (Ctrl+E) to edit material stream compositions
- [NEW] Added the capability of showing/hiding table items from the Property Grid

Version 2.1 Build 4438

- [CHG] Changed Adjust variables' units to match the ones in the selected system of units
- [FIX] Fixed custom system of units not being restored
- [FIX] Fixed Adjust behavior
- [FIX] Fixed Flowsheet printing
- [FIX] Fixed Steam Tables Property Package PVF/TVF stream spec calculation
- [FIX] Fixed Bubble and Dew points not being shown if the stream state is single phase
- [FIX] Fixed WFP donation window always showing
- [FIX] Fixed duplicate Separator Op in the Object Palette

Version 2.1 Build 4422

- [CHG] Overall speed and usability improvements
- [NEW] Added drag-and-drop support for opening simulations/cases from Windows Explorer

Version 2.1 Build 4416

- [CHG] Includes ChemSep Lite 6.90, now with 400+ compound database and 40 compounds/300 stages Column model
- [NEW] Includes PRSV2 Property Package with Van Laar-type mixing rule (original PRSV2 w/ Margules MR is now PRSV2-M)
- [FIX] Fixed PRSV2 compresibility factor calculation

Version 2.1 Beta Build 4410

- [NEW] New Property Package: Peng-Robinson-Stryjek-Vera 2 (PRSV2)
- [CHG] Added missing data estimation feature to the Data Regression Utility
- [CHG] Enhanced Unit Set Creator to start with units from the current system

Version 2.1 Beta Build 4407

- [CHG] Added LLE support and initial estimates calculation using UNIFAC structure to the Data Regression Utility
- [CHG] Changed density input from Specific Gravity to API Gravity on the Dist. Curves Characterization Utility
- [FIX] Fixed solver not recalculating outlet streams
- [FIX] Fixed infinite volumetric flow on first Material Stream calculation through the property grid
- [FIX] Fixed Adjust and Spec Ops not showing anything on the property grid

Version 2.1 Beta Build 4404

- [NEW] Added the Compound Creator Utility and corresponding user database structure (work in progress)
- [NEW] Added a Binary Data Regression utility (work in progress)
- [NEW] Added feature request #3409646 (Name given to Material Objects)
- [CHG] Rewritten solver logic increases calculation speed by 35% (Cavett sample)
- [FIX] Fixed Lee-Kesler Cp/Cv calculation
- [FIX] Fixed Distillation Curves Petroleum Characterization Utility
- [FIX] Fixed Pipe Segment model overall HTC calculation and liquid phase volume retrieval
- [FIX] Fixed Spanish translation of the Object Palette
- [FIX] Fixed bug #3409641 (Call to Terminate missing)
- [FIX] Fixed bug #3409637 (Collection Count method called twice in a row)
- [FIX] Fixed bug #3409628 (ICapeUtilities queried twice in a row)

Version 2.0 Build 4258

- [FIX] Fixed unit conversion from lbmol/h to mol/s
- [FIX] Fixed empty compound list array when adding DWSIM Property Packages to CAPE-OPEN simulators
- [FIX] Fixed calculation of activity coefficient when requested from external components (Excel/CAPE-OPEN)
- [FIX] Fixed Energy Stream parameter list (CAPE-OPEN)

Version 2.0 Build 4252

- [FIX] Fixed Compressor and Expander models for single component simulations
- [FIX] Fixed a bug that caused DWSIM to throw an exception on startup related to user-created unit systems
- [FIX] Fixed the negative temperature input bug on Heater and Cooler models

Version 2.0 Build 4251

- [FIX] Fixed the reference state for enthalpy and entropy calculations

Version 2.0 Build 4249

- [NEW] Excel Interface for Equilibrium and Property calculators
- [FIX] Minor bug fixes

Version 2.0 Build 4235

- [FIX] Fixed Shell and Tube Heat Exchanger shell side pressure drop calculation
- [NEW] Added an option to save simulations with password protection
- [CHG] Centralized flowsheet drawing surface (PFD)

Version 2.0 Build 4225

- [FIX] Fixed Shell and Tube Heat Exchanger model
- [FIX] Fixed Units of measure in Watch Panel
- [CHG] Changed update checker to show only a non-obtrusive link on the status panel

Version 2.0 Build 4220

- [NEW] Added a set of shapes for CAPE-OPEN Unit Operations in the flowsheet
- [FIX] Fixed CAPE-OPEN compliancy of the Steam Tables Property Package 
- [FIX] Corrected CAPE-OPEN Report Window behavior

Version 2.0 Build 4207

- [NEW] Support for CAPE-OPEN Unit Operations, Property Packages (1.0/1.1) and Plugins (Flowsheet Monitoring Objects)
- [NEW] DWSIM Property Packages can now be exposed to external CAPE-OPEN compliant simulators
- [NEW] Inside-Out Three-Phase (VLLE) Flash Algorithm
- [NEW] PC-SAFT (without association term) Property Package
- [NEW] UNIFAC Property Package with Liquid-Liquid interaction parameters
- [NEW] Liquid-Liquid Extractor operation mode for the Absorption Column
- [NEW] Three-Phase separation mode for the Vessel
- [NEW] ChemSep database automatic loading
- [NEW] Watch window - allows property monitoring from different objects at the same time
- [NEW] CAPE-OPEN Unit Reports window - view output from CAPE-OPEN Unit Operations
- [NEW] Updated flowsheet drawing theme
- [NEW] 'Send Error Info' button added to the Unhandled Exception window
- [NEW] New version checking tool - informs the user when a new version becomes available and downloads the setup file
- [FIX] General bug fixes and speed improvements

Version 1.8 Build 4101

- [NEW] 'Fouling Factor' calculation mode for the Heat Exchanger Shell and Tube model
- [NEW] Added non-linear solver IPOPT to the Optimizer
- [NEW] DWSIM now reads experimental liquid density and liquid thermal conductivity data for ChemSep components (enabled by default)
- [NEW] Added multiple selection capability to the flowsheet to enable moving multiple objects at once
- [NEW] Added a 'Snap to Grid' capability to the flowsheet for better object alignment
- [CHG] Reactivated flowsheet navigation through the arrow keys
- [CHG] Reactivated the quick connect tool on the flowsheet
- [CHG] General Heat Exchanger model improvements
- [FIX] Fixed 'lbmol/h' unit conversion from SI to English

Version 1.8 Build 4080

- [NEW] Model for rating Shell and Tube Heat Exchangers
- [NEW] Scripting support for pre- and post- Unit Op calculations
- [NEW] Console Output and Calculation Queue windows
- [NEW] "Fast mode" switch for Inside-Out Flash calculations

Version 1.8 Build 3947

- [NEW] Paste from Excel function (Ctrl-V) added to the Composition Editor
- [FIX] Fixed liquid density and water content calculations in Peng-Robinson IWVT Property Package
- [FIX] Fixed Grayson-Streed fugacity calculation
- [CHG] Added ChemSep component support to the COSMO-SAC Property Package

Version 1.8 Build 3938

- [NEW] New converter in Property Grid for some units (temperature, pressure, flow rates, etc.)
- [NEW] New gauge pressure units
- [FIX] Fixed a cut/paste bug in the script editor
- [FIX] Fixed wrong molar/mass fraction values in flowsheet tables

Version 1.8 Build 3922

- [NEW] COSMO-SAC Property Package based on the JCOSMO library (http://code.google.com/p/jcosmo/)
- [CHG] Improvements to the Custom UO script editor
- [CHG] Updated Plugin Interface definition

Version 1.8 Build 3908

- [NEW] Added IronPython, IronRuby, VBScript and JScript scripting support
- [NEW] Added a new Unit Operation: Custom UO, which lets the user run scripts as an unit operation calculation routine

Version 1.7 Build 3875

- [NEW] Added German translation by Rainer Göllnitz

Version 1.7 Build 3868

- [NEW] Interface definition for external plugins
- [FIX] Updated Rigorous Column solvers (Inside-Out and Simultaneous Correction)
- [FIX] Updated Critical Point calculation

Version 1.7 Build 3850

- [NEW] Lee-Kesler-Plöcker Property Package
- [FIX] Fixed K-value calculation call in the Sum Rates method for solving Absorption Columns
- [FIX] Fixed IO Flash calculation in single phase region
- [FIX] Fixed Critical Point calculation with PR and SRK Equations of State
- [FIX] Fixed portions of GUI language that were not being set on the first run

Version 1.7 Build 3840

- [NEW] Gibbs Reactor model (vapor phase only) with two solving methods: reaction extents and direct minimization
- [NEW] New global settings for Property Packages: Flash Algorithm and Calculate Bubble/Dew points
- [NEW] New approach for equilibrium calculation: Inside-Out by Boston and Britt
- [NEW] Added an option to adjust Rackett Parameters and Acentric Factors to match SG and NBP in Petroleum Characterization Utilities
- [NEW] New Quick Settings toolbar: Unit system and number formatting
- [NEW] New menu gives quick access to DWSIM Tools
- [NEW] Added the option to select stream component amounts as properties to show on PFD tables
- [CHG] Completely rewritten Equilibrium Reactor model
- [CHG] Updated ChemSep database loading code to support ChemSep 6.62
- [FIX] Fixed an exception when working with pump curves to calculate pump power
- [FIX] Fixed a bug in temperature calculation with the Steam Tables Property Package

Version 1.6 Build 3756

- [FIX] Fixed Conversion Reactor calculation with more than one reaction in parallel
- [FIX] Fixed Separator Vessel calculation under normal flash settings (Force PH flash option not selected)

Version 1.6 Build 3752

- [NEW] Component Separator Unit Op
- [NEW] Orifice Plate Unit Op
- [CHG] Improvements to the Optimizer, new solvers, more control options
- [CHG] Changed object insertion method from strip buttons to menu items, enhanced object palette to include new view modes
- [FIX] Fixed problems with rigorous column stream connections
- [FIX] Fixed Pump curves feature
- [FIX] Fixed Shortcut Column unhandled exception

Version 1.6 Build 3676

- [NEW] Added new rigorous column specification options
- [NEW] New rigorous column solving method: Napthali-Sandholm Simultaneous Correction (SC)
- [NEW] Added curves support to the Pump unit op
- [NEW] Added expression support to the Sensitivity Analysis Utility
- [FIX] Corrected Cooler and Heater heat exchanged sign
- [CHG] Various Flowsheet improvements (new font and color scheme, new table style, calculation indicator, improved connector drawing algorithm) 
- [CHG] General improvements to the IO Method, new configuration options
- [CHG] Added co/countercurrent flow direction selector to the Heat Exchanger
- [FIX] Fixed Pipe heat loss calculations
- [FIX] Fixed some translation errors
- [FIX] Removed degree symbol from Celsius temperature unit to improve compatibility with foreign languages
- [FIX] Fixed PH Flash setting in Thermo & Reactions configuration section not being effective
- [FIX] Optimizer/Sensitivity utilites: Fixed Material Streams' molar and volumetric flow changes not being effective
- [FIX] Fixed temperature calculations in the Steam Tables property package
- [FIX] Fixed Heat Exchanger Area calculation
- [FIX] Fixed Pipe properties not showing when the GUI language is set to Spanish

Version 1.6 Build 3618

- [FIX] Fixed control placement in the composition editor when using Spanish locale settings

Version 1.6 Build 3605

- [NEW] Added Spanish GUI translation (many thanks to Abad Lira and Gustavo León!)
- [NEW] Added a Multivariate, Constrained Optimization utility
- [NEW] Added a Sensitivity Analysis utility supporting up to 2 independent variables
- [NEW] Added "command-line run mode" (read the documentation for more details)
- [NEW] Added a 'Write to the Flowsheet' capability to the Spreadsheet
- [NEW] New Property Packages: Chao-Seader, Grayson-Streed, Modified UNIFAC (Dortmund) and Peng-Robinson with support for immiscible water and Volume Translation
- [NEW] New Energy Recycle unit operation
- [NEW] Added more units for the most commom properties (temperature, pressure, etc.)
- [NEW] Added code to display a message when the flash algorithm converges to the trivial solution
- [CHG] Redesigned UNIFAC group structure to include all available groups
- [CHG] Report can now show all properties from all objects in the flowsheet
- [CHG] Removed single-phase and phase change limitations from the Heat Exchanger
- [CHG] Property Package selection interface now groups packages by type
- [CHG] Changed component selection interface
- [FIX] Fixed bugs and made minor changes to the code/interface

Version 1.5 Build 3399

- [FIX] Corrected Ideal Gas Enthalpy/Entropy calculation for CheResources and ChemSep database components
- [FIX] Corrected heat duty sign in Equilibrium Reactor
- [FIX] Corrected a unit inconsistency in Rigorous Column heat balances

Version 1.5 Build 3398

- [NEW] Added component volumetric fraction / volumetric flow information to Material Streams
- [NEW] Added a liquid density calculation mode to EOS-specific Property Packages (EOS or Rackett) - this also affects partial volume calculations
- [FIX] Fixed bug #2750848 (null reference error when adding components)
- [FIX] Fixed the 'Recalculate All' calculator feature - it wasn't recalculating input streams
- [FIX] Fixed some errors in the Equilibrium Reactor calculation routine
- [FIX] Fixed some errors when connecting product streams to Absorbers
- [FIX] Added a default value of zero for the UNIFAC groups in the Component Creator to avoid null reference errors

Version 1.5 Build 3377

- [NEW] New Calculator features: Break Calculation, Recalculate All and Clear Queue List
- [NEW] Added information about calculation time
- [FIX] Fixed positioning of rigorous column connections
- [FIX] Fixed UNIFAC Property Package configuration error
- [FIX] Fixed rigorous column 'Decalculate' routine
- [FIX] Fixed stability curve (phase envelope utility) calculation issues
- [FIX] Rigorous columns are now recalculated when editing properties in modal windows
- [CHG] Changed calculator behavior so the interface is more responsive

Version 1.5 Build 3372

- [FIX] Object selection by mouse dragging now updates the property grid correctly
- [FIX] Changed liquid viscosity mixing rule (for multicomponent systems)
- [FIX] Fixed an error in liquid mixture surface tension calculation
- [FIX] Fixed null Viscosity error in C7+ characterization tool
- [FIX] Fixed PRLK Property Package configuration error
- [FIX] Fixed a bug in rigorous column condenser connections
- [FIX] Fixed n-Butane database parameter (liquid viscosity)
- [FIX] Fixed rigorous column full reflux condenser behavior
- [FIX] Fixed vessel and tank null object reference error
- [CHG] Speed improvements in column IO method

Version 1.5 Build 3353

- [NEW] Redesigned component database system
- [NEW] Added two new Property Packages: NRTL/Peng-Robinson and UNIQUAC/Peng-Robinson
- [NEW] Added support for loading ChemSep(TM) databases
- [NEW] Added a tool to characterize petroleum fractions from ASTM/TBP distillation curves
- [NEW] Added a tool to insert user-defined components
- [NEW] Added the ability to use multiple property packages in a single simulation
- [NEW] Dockable help window with localized tips
- [NEW] New Unit Operations: Distillation Column, Absorption Column, Refluxed Absorber and Reboiled Absorber
- [NEW] Rigorous Column solving methods: Bubble-Point, Sum-Rates and Inside-Out
- [NEW] New utility for calculation of Petroleum Cold Flow Properties
- [CHG] Surface Tension is now correctly listed as a liquid phase property
- [CHG] Redesigned splash and welcome screens
- [FIX] Fixed high-pressure vapor viscosity calculation
- [FIX] Fixed liquid viscosity calculation error when supercritical components are present
- [FIX] Fixed flash calculation vapor fraction initialization error (should avoid some impossible solutions)
- [FIX] Fixed culture-specific error related to Property Package parameter storage
- [FIX] Fixed calculation of vapor phase thermal conductivity
- [FIX] Fixed a bug in internal calculation of heat capacity ratio
- [FIX] Fixed MRU filelist

Version 1.4

- [NEW] Added three new Unit Operations: Shortcut Column, Equilibrium Reactor and a basic Heat Exchanger
- [NEW] Added three new utilities: PSV/Vessel Sizing and Spreadsheet
- [CHG] New drag-and-drop feature for adding objects to flowsheet
- [CHG] Some cosmetic changes in the PFD
- [CHG] The critical point utility was modified to calculate multiple critical points when they exists. It's (still) not perfect, but it should work well in most cases.
- [CHG] Petroleum Characterization Utility: temperature-dependent properties are now calculated only when requested, greatly improving the speed of the pseudocomponent creation process.
- [FIX] Corrected the PFD object numbering bug

Version 1.3

- This version is the first to be released under the GPL v3 license
- Added support for English language and translation. Contact the developer for more information.
- Added reactions (conversion, kinetic, equilibrium) and reactors support (Conversion, PFR, CSTR)
- Removed Krypton Toolkit controls in order to mantain consistency of the GUI as a whole
- English reporting now works correctly

- Corrected many other bugs from the previous version