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DWSIM Changelog

What's new in DWSIM 6.6.0

Aug 14, 2021
  • New 'Files' feature enables adding external files to the flowsheet
  • Updated User Guide
  • Added Inspector Report for Gibbs/Equilibrium Reactors
  • Fixed Python Script Import/Export (Classic UI)
  • Fixed async script execution

New in DWSIM 6.4 Update 9 (Apr 30, 2021)

  • Implemented feature request #126: Dynamics Integrator pause and resume (Classic UI)
  • New Separator Filler Utility (Dynamics)
  • Fixed issue #138: Flowsheet can't be saved
  • Fixed issue #137: Estimate Pipe Overall Heat Transfer Coefficient
  • Fixed issue #130: Stream Enthalpy not being correctly set by CAPE-OPEN Property Packages
  • Fixed issues with Seawater Property Package
  • Fixed drawing of some PFD Objects
  • Fixed Switch logical block behavior
  • Fixed active/inactive buttons not updating status in object editors (Classic UI)
  • Fixed Integrator results sheet formatting
  • Dynamics Volume-Temperature (VT) Flash fixes
  • Fixed distance units handling (Classic UI)
  • Fixed Liquid-Liquid Extraction column not working

New in DWSIM 6.4 Update 8 (Apr 12, 2021)

  • Updated User's Guide
  • Added Model Customization samples
  • Enhanced reliability of the Rigorous Column model solvers
  • Fixed issue 129 - CAPE-OPEN Thermodynamic Package configure failed
  • Fixed External Temperature gradient calculation in Pipe Segment model
  • Added visualization of External Temperature to Pipe Segment model
  • Fixed infinite loop in Electrolyte Property Packages
  • Fixed Adjust/Set not being inactive when they should
  • Fixed a bug with NL VLLE flash algorithm
  • Other minor fixes and enhancements

New in DWSIM 6.4 Update 7 (Apr 1, 2021)

  • New Database with Food Compounds (https://github.com/Spogis/DWSIMFoodProp)
  • Updated CoolProp libraries to v6.4.1
  • Grouped all Property Package editors in a single window (Classic UI)
  • Exposed CSTR's Vapor Residence Time and Headspace
  • Added an option to import compound data into Compound Creator from JSON files
  • Fixed issues with some flash algorithms
  • Fixed issues with Compound Creator
  • Fixed Gibbs/Equilibrium/Conversion Reactor mixed-phase product enthalpies
  • Fixed a bug with solids handling
  • Fixed a bug in Seawater Property Package
  • General UI Fixes

New in DWSIM 6.3 Update 4 (Nov 21, 2020)

  • [NEW] Advanced Python Script Kinetics
  • [CHG] PR/SRK calculation speed improvements
  • [CHG] Rigorous Column solver improvements
  • [FIX] Thermo subsystem fixes
  • [FIX] Bug fixes

New in DWSIM 6.3 Update 3 (Nov 5, 2020)

  • [CHG] Enhanced Automation functionality
  • [FIX] Fixed issues with phase equilibria calculation in some specific cases
  • [FIX] Other fixes and enhancements

New in DWSIM 6.3 Update 2 (Nov 3, 2020)

  • [CHG] Rigorous Column solver reliability and speed enhancements
  • [FIX] Bug fixes

New in DWSIM 6.3 Update 1 (Nov 3, 2020)

  • [NEW] Rigorous Column BP Solver now supports all Condenser/Reboiler specifications
  • [FIX] Bug fixes and enhancements

New in DWSIM 6.3 (Oct 27, 2020)

  • [NEW] New Thermodynamics subsystem with Univeral Flash Algorithm used by default
  • [FIX] Bug fixes and enhancements

New in DWSIM 6.2 Update 4 (Oct 22, 2020)

  • [NEW] Added an option to disable skipping of equilibrium calculation on some Material Streams (feature introduced in Update 2)
  • [CHG] Usage of IPOPT solver in Equilibrium Reactor is optional
  • [FIX] Minor bug fixes

New in DWSIM 6.2 Update 3 (Oct 21, 2020)

  • [NEW] Added an editor for custom properties (Classic UI)
  • [CHG] Updated Equilibrium Reactor Solver
  • [FIX] General bug fixes and enhancements

New in DWSIM 6.2 Update 2 (Oct 17, 2020)

  • [CHG] Enhanced reliability of the Flash Algorithms
  • [CHG] Optimized calculation speeds by removing unnecessary Material Stream calculations
  • [FIX] General bug fixes and enhancements

New in DWSIM 6.2 Update 1 (Oct 8, 2020)

  • [NEW] Multiphase (SVLLE) Gibbs Minimization Flash Algorithm
  • [NEW] Added more units for mass, standard condition volumetric and power/heat flow
  • [NEW] Added a new plugin for Heat of Combustion calculation
  • [FIX] Bug fixes

New in DWSIM 6.2 (Oct 1, 2020)

  • [NEW] New compounds: Sulfuric Acid, Solid Carbon, Mercury, Casein, Lactose, Methyl Oleate, Myristic Acid, Triolein
  • [NEW] GERG-2008 Property Package
  • [NEW] PC-SAFT (with Association Support) Property Package
  • [NEW] Peng-Robinson (1978) Property Package
  • [NEW] Temperature-dependent Interaction Parameter PR78/SRK Property Packages
  • [FIX] Fixed Dynamic Mode error messages
  • [FIX] Fixed an issue with Gibbs Reactor's element matrix editor
  • [FIX] Fixed flowsheet object appearance editor (Classic UI)
  • [FIX] Minor bug fixes

New in DWSIM 6.1 Update 10 (Sep 28, 2020)

  • [CHG] Changed minimum required .NET Framework version to v4.6.2 on Windows
  • [FIX] Fixed Unit Operations energy balance check
  • [FIX] Fixed PFR energy balance
  • [FIX] Fixed a regression in Nested Loops VLLE Flash
  • [NEW] Added an option to open editors with a double-click (Classic UI)

New in DWSIM 6.1 Update 9 (Sep 20, 2020)

  • [FIX] Fixed a regression with Nested Loops VLE Flash Algorithm

New in DWSIM 6.1 Update 8 (Sep 17, 2020)

  • Fixed a regression with Nested Loops VLE Flash Algorithm.

New in DWSIM 6.1 Update 7 (Sep 16, 2020)

  • Enhanced reliability of Gibbs Reactor solver
  • Fixed PR/SRK Interaction Parameters missing on first run
  • Fixed CSTR convergence in some cases
  • Fixed an issue with the Element Matrix editor on Gibbs Reactor
  • Fixed reaction editors windows being modal (Classic UI)
  • Other minor bug fixes

New in DWSIM 6.1 Update 6 (Sep 7, 2020)

  • [NEW] Added an option to initialize Gibbs Reactor solver from a previous valid solution
  • [FIX] Mono/Linux bug fixes
  • [FIX] Fixed Sensitivity Analysis window on Cross-Platform UI

New in DWSIM 6.1 Update 5 (Sep 6, 2020)

  • [NEW] Added Mean Ionic Activity Coefficient property
  • [CHG] Updated valve P2 calculation in kv gas mode
  • [CHG] Added valve equations for supercritical expansion
  • [FIX] Fixed issues 4, 20, 21, 22, 23, 24, 25, 27, 29, 30 and 31 (https://github.com/DanWBR/dwsim6/issues?q=is%3Aissue+is%3Aclosed)
  • [FIX] Rewritten Gibbs reactor solver
  • [FIX] Bug fix CAPE-OPEN UO connection update
  • [FIX] Fixed null property error when displaying on Property Table
  • [FIX] Fixed handling of partial liquefaction
  • [FIX] Other minor bug fixes

New in DWSIM 6.1 Update 4 (Aug 24, 2020)

  • [CHG] Updated Python.NET library on Windows to match Python 3.7 runtime
  • [FIX] Fixed a bug with master property table
  • [FIX] Fixed Excel Add-In
  • [FIX] Fixed issues 15, 16, 17 and 19

New in DWSIM 6.1 Update 3 (Aug 18, 2020)

  • [NEW] Added an option to force reset of all objects before running a Schedule (Dynamics)
  • [NEW] Added an option to close all editors (Cross-Platform UI)
  • [CHG] Updated Gibbs/Equilibrium Reactor solvers
  • [FIX] Fixed PID Controller not associating with Linked scripts
  • [FIX] Other bug fixes

New in DWSIM 6.1 Update 2 (Aug 12, 2020)

  • [NEW] Added Helper Functions to Flowsheet (Scripting)
  • [CHG] Updated Spreadsheet property importing/exporting to include units
  • [FIX] Bug fixes

New in DWSIM 6.0 Update 7 (Jul 19, 2020)

  • [FIX] Bug fixes and adjustments

New in DWSIM 6.0 Update 6 (Jul 15, 2020)

  • [FIX] Fixed a bug in Dynamic Mode
  • [FIX] Other fixes and enhancements

New in DWSIM 6.0 Update 5 (Jul 6, 2020)

  • [NEW] Added new Automation interface (Automation2), works on Linux and macOS
  • [FIX] Fixed Energy Stream editor (Classic UI)
  • [FIX] Fixed a bug with Black Oil Property Package
  • [FIX] Fixed Compound Creator's Liquid Cp regression (Classic UI)
  • [FIX] Fixed PFD definition on macOS when using CPU Renderer
  • [FIX] Other fixes and enhancements

New in DWSIM 6.0 Update 4 (Jun 18, 2020)

  • Fixed default units for Cp, Cv and entropy (Excel Add-In)
  • [FIX] Fixed Material Stream editor not showing the Dynamic Spec tab (CPUI)
  • [FIX] Fixed/Updated some dynamic models

New in DWSIM 6.0 Update 3 (Jun 14, 2020)

  • [NEW] Dynamic Models for CSTR and PFR
  • [NEW] Added Search Box to Cross-Platform UI PFD
  • [FIX] Bug fixes and enhancements

New in DWSIM 6.0 Update 2 (Jun 7, 2020)

  • [NEW] Dynamic Model for Heat Exchanger
  • [NEW] PID Controller Wind-Up Guard
  • [NEW] Dynamic Integrator flowsheet charts for Monitored Variables
  • [FIX] Bug fixes and enhancements

New in DWSIM 6.0 (May 28, 2020)

  • [NEW] Dynamic Simulation Mode
  • [NEW] New Object Types: PID Controller, Analog/Digital/Level Gauges, Input Box, Switch
  • [NEW] New PID Controller Tuning tool
  • [NEW] Store/Restore Flowsheet Solutions
  • [FIX] Various bug fixes and enhancements

New in DWSIM 5.8 Update 11 (Apr 13, 2020)

  • [FIX] Fixed Compressor/Expander Head calculations
  • [FIX] Fixed Compressor/Expander not being added to the flowsheet (Cross-Platform UI)
  • [FIX] Fixed display of first and last stage pressures of Absorption Columns

New in DWSIM 5.8 Update 10 (Feb 21, 2020)

  • [NEW] Update compound data from JSON file while importing
  • [FIX] Updated SVLLE Flash Algorithm to handle forced solids
  • [FIX] Fixes for High DPI displaying (Classic UI)
  • [FIX] Raoult's Law/Activity Coeff. Property Packages: added an option to calculate Solid Phase Enthalpy with Solid Cp
  • [FIX] General bug fixes and minor enhancements

New in DWSIM 5.8 Update 9 (Feb 18, 2020)

  • [FIX] General bug fixes and minor enhancements

New in DWSIM 5.8 Update 8 (Feb 11, 2020)

  • [NEW] Added a Pervaporation sample
  • [NEW] Added support for external Unit Operations
  • [NEW] Added the ability to load and use images as flowsheet object icons for Python Script UOs
  • [FIX] Fixed some automation bugs
  • [FIX] Fixed Pipe insulation calculation
  • [FIX] Bug fixes

New in DWSIM 5.8 Update 6 (Jan 17, 2020)

  • [NEW] Define the number of grouping rows in Master Property Table
  • [FIX] Fixed loading and saving of simulation files in mobile version format (Android/iOS)
  • [FIX] Fixed Absorber Column in Liquid-Liquid Extraction mode
  • [FIX] Fixed the Filter property editor in Cross-Platform UI
  • [FIX] Fixed Filter cake resistance unit conversion
  • [FIX] Fixed the Script Editor not working on Classic UI
  • [FIX] Other bug fixes

New in DWSIM 5.8 Update 5 (Dec 4, 2019)

  • [NEW] Integrated Solution Inspector with object editors
  • [CHG] Enhanced compound selection panel in simulation setup wizard (Classic UI)
  • [FIX] Fixed a bug with Master Tables
  • [FIX] Fixed Excel Add-In Settings panel not loading correctly
  • [FIX] Other bug fixes

New in DWSIM 5.8 Update 4 (Nov 11, 2019)

  • [NEW] Added a Tag property to compounds for custom ordering
  • [NEW] Added Compound ordering capability to Cross-Platform UI (CPUI)
  • [NEW] Enhanced object connections editor (CPUI)
  • [FIX] Fixed Spreadsheet Copy/Paste (CPUI)
  • [FIX] Fixed Compressor/Expander calculation mode selection (CPUI)

New in DWSIM 5.8 Update 3 (Oct 24, 2019)

  • [FIX] Fixed Valve Kv calculation mode for Gas/Steam
  • [FIX] Fixed loading of properties for some Unit Operations
  • [FIX] Other minor bug fixes

New in DWSIM 5.8 Update 1 (Oct 16, 2019)

  • [CHG] Changed target .NET Framework version to 4.6.1 on Windows
  • [CHG] Reduced the size of the User Guide PDF file
  • [FIX] Fixed Automation feature
  • [FIX] Fixed some issues with ReoGrid formula parsing
  • [FIX] Enhanced reliability of liquid phase instability detection

New in DWSIM 5.8 (Oct 10, 2019)

  • [NEW] Enhanced Spreadsheet Tool
  • [NEW] 2D Charts Tool
  • [NEW] Enhanced Script Editor (Cross-Platform UI)
  • [NEW] Dynamic Script Snippets
  • [CHG] Redesigned Cross-Platform UI
  • [CHG] Redesigned Property Package editors
  • [FIX] Fixed some unit conversions for reaction basis
  • [FIX] Fixed text to number conversions
  • [FIX] Fixed flowsheet dragging while zoomed
  • [FIX] Fixed PFR heat balance
  • [FIX] Fixed liquid phase viscosity calculation for supercritical compounds
  • [FIX] Fixed Splitter ratios calculation mode
  • [FIX] Workaround for math expression parsing errors

New in DWSIM 5.7 Update 14 (Aug 2, 2019)

  • [CHG] Added 'This' to python vars (Python Script UO)
  • [FIX] Fixed flowsheet dragging while zoomed
  • [FIX] Fixed exception when launching the Script Editor (Classic UI)
  • [FIX] Fixed Energy Stream connection editors for Python Script UO (Classic UI)

New in DWSIM 5.7 Update 13 (Jul 20, 2019)

  • [NEW] Insert IronPython Script Snippets (Classic UI)
  • [CHG] Restored Reference Object functionality to Controller/Adjust Logical Block
  • [CHG] Restored Maximum Iterations editor to Recycle Logical Block
  • [CHG] Optimized Isothermal Compressibility calculation
  • [FIX] Fixed layout of object editors (Classic UI)
  • [FIX] Fixed Thermo library registration
  • [FIX] Fixed Molar Volume value in Material Stream report
  • [FIX] Minor bug fixes

New in DWSIM 5.7 Update 12 (Jul 20, 2019)

  • [NEW] Added the ability to work with reaction parameters in optimization and sensitivity analysis tools (Classic UI)
  • [NEW] Added the ability to load external Property Packages
  • [NEW] Added solid fugacity config options to Property Packages
  • [FIX] Fixed sorting of optimizer variable properties (Classic UI)
  • [FIX] Fixed textbox text color on Property Package config editor (Cross-Platform UI)

New in DWSIM 5.7 Update 11 (Jun 27, 2019)

  • [FIX] Fixed PR/SRK volume translation correction for C1-C10, H2S, N2 and CO2
  • [FIX] Fixed splitter split ratio trackbar precision / added editable textboxes (Classic UI)
  • [FIX] Fixed Flowsheet.AddObject() not working in automation mode

New in DWSIM 5.7 Update 10 (Jun 18, 2019)

  • [NEW] Exposing CAPE-OPEN object on CAPE-OPEN Unit Operation ('GetCAPEOPENObject()' method
  • [FIX] Fixed compound grid row double click (Classic UI)
  • [FIX] Fixed Valve calculation for Liquid Service Kv mode

New in DWSIM 5.7 Update 9 (Jun 3, 2019)

  • [CHG] Changed Welcome Panel button icons (Classic UI)
  • [FIX] Fixed ChemSep column mass/energy balance warnings
  • [FIX] Restored GUI language selection (Classic UI)
  • [FIX] Compound search textbox crash (Classic UI)
  • [FIX] eNRTL fix - [FIX] Electrolyte Flash warning message
  • [FIX] Fixed Advanced Property Package Settings window not on top (Classic UI
  • [FIX] Fixed units mismatch on assay manager (Classic UI)
  • [FIX] Other bug fixes

New in DWSIM 5.7 Update 8 (May 17, 2019)

  • [NEW] Highlight phase areas in Binary Envelope (Cross-Platform UI)
  • [NEW] Context menu for charts (Cross-Platform UI)
  • [NEW] Split Material/Energy Streams and Insert Recycles (Classic UI)
  • [NEW] Order compound lists (Classic UI)
  • [NEW] Exposing petroleum cold flow properties from utility (Classic UI)
  • [FIX] Fixed solver infinite loop detection
  • [FIX] Other bug fixes

New in DWSIM 5.7 Update 7 (May 3, 2019)

  • Enhanced Phase/Binary Envelopes in Cross-Platform UI
  • Fixed compound adding by pressing ENTER on the search box (Classic UI)
  • Fixed Phase Identification Parameter in Phase Envelope
  • Fixed merged ToolStrips in Classic UI
  • Minor bug fixes and tweaks in Cross-Platform UI

New in DWSIM 5.7 Update 6 (Apr 26, 2019)

  • [NEW] IronPython Script Debugging (Classic UI)
  • [CHG] Updated components info in about boxes
  • [FIX] Fixed Custom Calculation Order not working (Classic UI)
  • [FIX] Fixed Pressure units in Valve's Kv calculation mode
  • [FIX] Other minor bug fixes

New in DWSIM 5.7 Update 5 (Apr 10, 2019)

  • [NEW] Added Python standard libraries
  • [CHG] Electrolyte flash enhancements
  • [FIX] Fixed double conversion from string
  • [FIX] Fixed remaining CefSharp processes after shutdown (Classic UI)
  • [FIX] Fixed compound issues on Classic UI

New in DWSIM 5.7 Update 4 (Apr 10, 2019)

  • [FIX] Fixed editors not updating on Compound and Property Package/Flash Algorithm changes (New UI)
  • [FIX] SLE-only Fixed binary envelope (Classic UI)

New in DWSIM 5.7 Update 3 (Apr 9, 2019)

  • [NEW] Spreadsheet cell formatting tools (Classic UI)
  • [FIX] Fixed importing of property units to spreadsheet (Classic UI)
  • [FIX] Fixed pressure drop on Gibbs and Equilibrium reactors

New in DWSIM 5.7 Update 2 (Apr 6, 2019)

  • [NEW] Structured object result reports (New UI)
  • [NEW] User-defined expressions for velocity constants (Kinetic Reactions)
  • [CHG] Redesigned reaction editors (New UI)
  • [CHG] Redesigned flowsheet analysis tools (New UI)
  • [FIX] Fixed PFD delayed connector drawing

New in DWSIM 5.7 Update 1 (Apr 1, 2019)

  • [NEW] Exposing additional reactor properties to tables and analysis tools
  • [NEW] Shortcut selection buttons on table editors (Classic UI)
  • [FIX] Fixed Electrolyte DB
  • [FIX] Fixed pressure drop on Gibbs and Equilibrium reactors

New in DWSIM 5.7 (Mar 24, 2019)

  • - [NEW] Electrolyte NRTL model for Sour Gas and Amine systems
  • - [NEW] Copy Flowsheet as image to clipboard
  • - [NEW] New Web Panel (Classic UI)
  • - [CHG] Redesigned Welcome Screen (Classic UI)
  • - [CHG] Redesigned Compound Selector (Classic UI)
  • - [CHG] Updated ChEDL Compound Database
  • - [CHG] Restored 'print flowsheet' function (Classic UI)
  • - [FIX] Fixed object cloning
  • - [FIX] Fixed SLE flash
  • - [FIX] Fixed english dynamic viscosity units
  • - [FIX] Fixed mirrored characters on flowsheet objects
  • - [FIX] Bug fixes

New in DWSIM 5.6 Update 12 (Feb 11, 2019)

  • [NEW] Change calculation order (Cross-Platform UI)
  • [NEW] User-Defined (Python) Flash Algorithm
  • [NEW] User can now override Unit Operation and Material Stream calculation routines using Python Scripts

New in DWSIM 5.6 Update 11 (Feb 6, 2019)

  • [NEW] Added the possibility to change the calculation order on Classic UI (hold Ctrl+Alt before solving the flowsheet)
  • [NEW] User can now override K-value Fugacity, Enthalpy and Entropy calculations at Property Package level using Python Scripts
  • [FIX] Fixed Side Draw flowrate input (Classic UI)

New in DWSIM 5.6 Update 10 (Feb 4, 2019)

  • - [FIX] Fixed white background on Dark Mode (macOS)
  • - [FIX] Immiscible VLLE Flash fixes, restored missing compound selection

New in DWSIM 5.6 Update 9 (Jan 25, 2019)

  • [NEW] New Excel Add-In 'GetPropUnits' function (Windows only)
  • [FIX] Fixed calculation of special properties (Excel Add-In)
  • [FIX] Fixed Pipe Segment's Outlet P/T spec mode
  • [FIX] Fixed some Classic UI issues with High-DPI displays

New in DWSIM 5.6 Update 7 (Dec 19, 2018)

  • Fixed 'Create and Connect' buttons (Classic UI)
  • Fixed Heater/Cooler report (New UI)

New in DWSIM 5.6 Update 5 (Dec 3, 2018)

  • [NEW] Load FOSSEE Flowsheets and Samples from the File menu (Classic UI)
  • [NEW] Customize Systems of Units on Simulation Settings Wizard (Classic UI)
  • [NEW] Added ChemSep Column directly from the Object Palette
  • [FIX] Other bug fixes and enhancements

New in DWSIM 5.6 Update 3 (Nov 28, 2018)

  • [FIX] Fixed Flowsheet Zoom
  • [FIX] Fixed Petroleum Characterization

New in DWSIM 5.6 Update 2 (Nov 27, 2018)

  • [FIX] Fixed bugs in Gibbs and Equilibrium reactors
  • [FIX] Fixed Oveerhead Vapor connection (Rig Dist Column)
  • [FIX] Minor bug fixes and enhancements

New in DWSIM 5.6 (Nov 24, 2018)

  • [NEW] Unified Process Flowsheet Drawing interface
  • [CHG] Redesigned Distillation/Absorption Column connection editor
  • [FIX] Fixed Steam Tables Enthalpy/Entropy calculation near saturation points
  • [FIX] Fixed a regression in Nested Loops VLE Flash
  • [FIX] Minor bug fixes and enhancements

New in DWSIM 5.5 (Nov 12, 2018)

  • [NEW] Added an option to use legacy property editors
  • [NEW] Unit tooltips on property editors
  • [NEW] Random property units on floating tables
  • [NEW] Added more Flash functions to Excel interface
  • [NEW] Restored Command Line funcionality
  • [CHG] Redesigned Compound Creator
  • [FIX] Fixed PFR bugs
  • [FIX] Exposing Script UO variables (CPUI)
  • [FIX] Fixed reaction editors
  • [FIX] Fixed Excel interface
  • [FIX] Other bug fixes and enhancements

New in DWSIM 5.4 (Oct 16, 2018)

  • NEW:
  • A new Global Flash Algorithm supporting one solid, one vapor and two liquid phases, is now the default one
  • Updated Inspector Window for Classic UI
  • CHANGED:
  • Enhanced reliability of the liquid phase stability test, removes the need for stability search key compound selection
  • Missing NRTL/UNIQUAC Interaction Parameters warning only for non-zero compound amounts
  • FIX:
  • Fixed broken sample simulations

New in DWSIM 5.3 Update 32 (Oct 6, 2018)

  • [NEW] Support for Dark Mode on macOS Mojave (10.14)
  • [NEW] Support for High DPI displays on Linux with configurable Scaling Factor (Cross-Platform UI)
  • [NEW] Download and Open FOSSEE Flowsheets directly from DWSIM
  • [NEW] Configurable warning for missing interaction parameters on Activity Coefficient-based Models
  • [NEW] Cross-Platform UI users can now edit initial estimates for Distillation and Absorption Columns
  • [CHG] Now requires Mono v5.14 or newer on Linux, which fixes many Classic UI (Windows Forms) glitches on this platform
  • [CHG] Prevented unreliable UNIQUAC interaction parameters from loading
  • [CHG] Bypass CAPE-OPEN Unit Operations on macOS and Linux
  • [FIX] Minor bug fixes

New in DWSIM 5.2 Update 22 (Sep 28, 2018)

  • Improved font rendering on Cross-Platform UI PFD Designer
  • Fixed stoichiometric coefficient input on reaction editor (Classic UI)

New in DWSIM 5.2 Update 21 (Sep 27, 2018)

  • [FIX] Fixed a regression in Heat Exchanger model

New in DWSIM 5.2 Update 19 (Sep 17, 2018)

  • [FIX] Fixed a regression in Steam Tables Property Package

New in DWSIM 5.2 Update 18 (Sep 12, 2018)

  • [NEW] Liquid Viscosity Pressure Correction
  • [FIX] Fixed Letsou-Stiel Liquid Viscosity estimation

New in DWSIM 5.2 Update 17 (Sep 11, 2018)

  • Liquid Density calculation fixes and enhancements
  • Minor bug fixes

New in DWSIM 5.2 Update 16 (Sep 4, 2018)

  • [NEW] Exposed Gibbs Reactor Numerical Derivative Perturbation
  • [FIX] Bug fixes (PFR, Orifice Plate)

New in DWSIM 5.2 Update 14 (Aug 21, 2018)

  • Fixed Classic UI Material Stream Editor

New in DWSIM 5.2 Update 13 (Aug 14, 2018)

  • [NEW] Enhancements to input textboxes
  • [NEW] Enter math expressions on input textboxes

New in DWSIM 5.2 Update 12 (Aug 14, 2018)

  • [NEW] New Kv calculation mode for Valve model
  • [NEW] User-Defined Pipe Wall Material
  • [NEW] Unit locking mode for Spreadsheet (Classic UI)
  • [FIX] Fixed a bug with Pump calculations
  • [FIX] Fixed simulation comments not restoring correctly on Classic UI

New in DWSIM 5.2 Update 11 (Aug 14, 2018)

  • [NEW] Heat Exchanger thermal efficiency calculation mode
  • [CHG] Material Stream editor updates (Classic UI)
  • [FIX] Fixed Flowsheet Object cloning
  • [FIX] Fixed Liquid Phase Enthalpy calculation for some Property Packages

New in DWSIM 5.2 Update 10 (Aug 14, 2018)

  • [FIX] Fixed a bug with the CAPE-OPEN UO Socket
  • [FIX] Fixed Adjust Control Panel (Classic UI)
  • [FIX] Fixed Update reminder

New in DWSIM 5.2 Update 9 (Aug 14, 2018)

  • [NEW] Added Floating Table for compound amounts in Material Streams
  • [NEW] Copy data from chart objects
  • [FIX] Fixed bugs with the PFR and Equilibrium Reactors
  • [FIX] Fixed Adjust Control Panel (Classic UI)

New in DWSIM 5.2 Update 8 (Aug 14, 2018)

  • [NEW] Solution Inspector enhancements
  • [FIX] Fixed loading of mobile-saved simulation files
  • [FIX] Fixed a bug with the Equilibrium Reactor
  • [FIX] Other bug fixes

New in DWSIM 5.2 Update 7 (Aug 14, 2018)

  • [FIX] Fixed a bug with the Compound Creator Wizard
  • [FIX] Fixed a bug with the SVLE Flash Algorithm
  • [FIX] CAPE-OPEN fixes
  • [FIX] Fixed pipe segment diameter quick input (Classic UI)
  • [FIX] Other fixes and enhancements

New in DWSIM 5.2 Update 6 (Aug 14, 2018)

  • [NEW] Added Quality Check to Petroleum Characterization Tools
  • [CHG] Enhanced Petroleum Characterization Tools on Cross-Platform UI
  • [CHG] Removed Update checkboxes on Classic UI
  • [FIX] Fixed missing Expander on Cross-Platform UI
  • [FIX] Bug fixes

New in DWSIM 5.2 Update 5 (Aug 14, 2018)

  • [NEW] Data copy from property tables to clipboard (Cross-Platform UI)
  • [CHG] Limited the maximum mumber of simultaneous opened object editors
  • [FIX] Fixed data copy from property table to clipboard (Classic UI)
  • [FIX] Bug fixes

New in DWSIM 5.2 Update 4 (Aug 14, 2018)

  • [FIX] Bug fixes

New in DWSIM 5.2 Update 3 (Aug 14, 2018)

  • [FIX] Fixed a bug with the PFR model
  • [FIX] Fixed a bug with the Heat Exchanger model
  • [FIX] Fixed a bug with the Compound Separator model
  • [FIX] Report tool fixes (Classic UI)
  • [FIX] Touch Bar fix for macOS < 10.12.2

New in DWSIM 5.2 Update 2 (May 24, 2018)

  • [FIX] Fixed Python.NET issues on Linux and macOS
  • [FIX] Fixed flowsheet object removal on Cross-Platform UI
  • [FIX] Fixed error when connecting rigorous distillation column reboiler duty on Cross-Platform UI
  • [FIX] Fixed a bug with the spreadsheet
  • [FIX] Restored backup function on Classic UI
  • [FIX] Fixed mouse wheel absent bug on Classic UI

New in DWSIM 4.0 Update 25 (Oct 18, 2016)

  • [FIX] Fixed bugs with the Steam Tables Property Package

New in DWSIM 4.0 Update 24 (Oct 18, 2016)

  • [FIX] Fixed Splitter Mass/Mole Flow Spec mode

New in DWSIM 4.0 Update 23 (Oct 18, 2016)

  • [FIX] Fixed Steam Tables property calculation on supercritical region
  • [FIX] Other minor fixes

New in DWSIM 4.0 Update 22 (Oct 18, 2016)

  • [FIX] Fixed liquid phase reactions on Equilibrium reactors
  • [FIX] Fixed Outlet Pressure units on Expander editor

New in DWSIM 4.0 Update 21 (Oct 18, 2016)

  • [FIX] Fixed writing of Spreadsheet Variables to Flowsheet
  • [FIX] Fixed some unit conversions
  • [CHG] More German translations

New in DWSIM 4.0 Update 20 (Oct 18, 2016)

  • [FIX] Fixed Petroleum Characterization utilities not working
  • [CHG] More German translations

New in DWSIM 4.0 Update 19 (Oct 18, 2016)

  • [FIX] Fixed Specification Block calculation
  • [FIX] Fixed Solid Phase Enthalpy calculation on Activity Coefficient models

New in DWSIM 4.0 Update 18 (Oct 18, 2016)

  • [FIX] Fixed PR calculation bug when adding compounds after creating a simulation
  • [FIX] Fixed Steam Tables Enthalpy/Entropy calculation
  • [FIX] Fixed Rigorous Column Reboiler/Condenser Pressure setting
  • [FIX] Fixed Splitter Editor ratio sliders
  • [CHG] More German translations

New in DWSIM 4.0 Update 15 (Oct 18, 2016)

  • [FIX] Fixed Steam Tables Property Package
  • [FIX] Fixed input for Material Streams connected to Recycles
  • [FIX] Fixed Script Editor auto-completion

New in DWSIM 4.0 Update 14 (Oct 18, 2016)

  • [FIX] Fixed number precision loss on saved XML files

New in DWSIM 4.0 Update 13 (Oct 18, 2016)

  • [FIX] Fixed cryptographic issues on FIPS-compliant systems
  • [FIX] Fixed opening sample files on read-only installations

New in DWSIM 4.0 Update 12 (Oct 18, 2016)

  • [CHG] Exposing convergence tolerances in Pipe Segment editor

New in DWSIM 4.0 Update 11 (Oct 18, 2016)

  • Fixes to Extended UNIQUAC, Sour Water and Steam Tables Property Packages
  • [FIX] Fixed Energy Stream connection to Pipe Segment UO

New in DWSIM 4.0 Update 10 (Oct 18, 2016)

  • [FIX] Fixed Electrolyte PVF Flash

New in DWSIM 4.0 Update 9 (Oct 18, 2016)

  • [FIX] Fixed command buttons not showing in Data Regression Utility

New in DWSIM 4.0 Update 8 (Oct 18, 2016)

  • [FIX] Electrolytes subsystem stability and reliability enhancements
  • [FIX] Fixed Material Stream, Heater/Cooler, Adjust and Spec editors
  • [FIX] Minor bug fixes and enhancements

New in DWSIM 4.0 Update 7 (Oct 18, 2016)

  • [FIX] Fixed Excel Add-In 'CalcProp' function for mass-based properties

New in DWSIM 4.0 Update 6 (Oct 18, 2016)

  • [NEW] Added an option to hide solid phase from list of present phases (for ChemSep compatibility)
  • [NEW] Sour Water PP: Added an option to ignore vapor fraction bounds during flash calculations

New in DWSIM 4.0 Update 5 (Oct 18, 2016)

  • [FIX] Fixed missing Compound Spec selection on Rigorous Column editor
  • [FIX] Fixed non-converging samples
  • [FIX] Fixed bugs in the Flowsheet UO

New in DWSIM 4.0 Update 4 (Oct 18, 2016)

  • [FIX] Fixed loading of DWSIM 3.x simulations with logical blocks
  • [FIX] Fixed bugs in the Flowsheet UO

New in DWSIM 4.0 Update 3 (Oct 18, 2016)

  • [FIX] Fixed Gibbs Reactor Editor
  • [FIX] Fixed Pipe insulation k calculation
  • [FIX] Fixed Material Stream editor composition Clear/Equalize buttons

New in DWSIM 4.0 Update 2 (Oct 18, 2016)

  • [FIX] Fixed issues with Adjust and Simultaneous Adjust Solver

New in DWSIM 4.0 Update 1 (Oct 18, 2016)

  • [FIX] Fixed issues with Adjust and Spec logical blocks

New in DWSIM 4.0 (Oct 18, 2016)

  • [FIX] Fixed enthalpy and entropy calculation for Activity Coefficient-based Property Packages

New in DWSIM 3.7 Build 6055 (Aug 1, 2016)

  • [FIX] Fixed enthalpy and entropy calculation for activity coefficient-based Property Packages
  • [FIX] Fixed ideal gas enthalpy and entropy calculation
  • [FIX] Fixed pipe segment inclination
  • [FIX] Fixed Inside-Out PT Flash early convergence

New in DWSIM 4.0 Build 6055 RC 2 (Jul 30, 2016)

  • [FIX] Fixed Material Stream flowrate editing
  • [FIX] Other bug fixes and enhancements

New in DWSIM 4.0 Build 6053 RC 1 (Jul 29, 2016)

  • [NEW] Petalas-Aziz pressure drop calculation model now available for Windows 64-bit and Linux 32/64-bit
  • CHG] Updated documentation
  • [CHG] Updated CoolProp library to v6.0.0
  • [CHG] Pipe Segment editor enhancements
  • [FIX] Compound Creator fixes
  • [FIX] Other bug fixes and enhancements

New in DWSIM 4.0 Build 6046 Preview 4 (Jul 22, 2016)

  • [FIX] Fixed missing Shortcut Column editor
  • [FIX] Restored user-defined interaction parameter funcionality
  • [FIX] Fixed ideal gas enthalpy/entropy calculation
  • [FIX] Other bug fixes and enhancements

New in DWSIM 3.7 Build 5981 (Jul 8, 2016)

  • Bug fixes to reactor models
  • Bug fix for Nested Loops VLLE and Simple LLE flash algorithms
  • Fixed a bug in the Data Regression utility
  • Fixed pipe wall conductivity calculation
  • Fixed CAPE-OPEN Property Package Manager 64-bit registration

New in DWSIM 4.0 Build 6028 Preview 3 (Jul 4, 2016)

  • Bug fixes

New in DWSIM 4.0 Build 6024 Preview 2 (Jun 30, 2016)

  • [NEW] Excel Add-In ribbon menu
  • [CHG] Redesigned Material Stream editor
  • [FIX] Various bug fixes and enhancements

New in DWSIM 4.0 Build 6013 Preview 1 (Jun 21, 2016)

  • [NEW] Update User Interface
  • NEW] Automatic Updates
  • [NEW] Flowsheet utilities: Split/Merge Energy/Material Streams, Resize Objects, Search Bar, Add Rectangle
  • [NEW] Export Report data to ODT/ODS files
  • NEW] Heat Exchanger Pinch Point calculation mode
  • [NEW] Pipe Segment ambient temperature gradient
  • [CHG] Calculation speed improvements up to 50%
  • [CHG] Changed Property Tables (Floating, Simple, Master and Linked) behavior - [CHG] Utilities are now linked to Flowsheet Objects, can be added multiple times and saved/restored with simulation files
  • [FIX] Many bug fixes and improvements

New in DWSIM 3.7 Build 5965 (May 3, 2016)

  • [NEW] Added more optimizer options to Data Regression utility and Gibbs Minimization flash algorithm
  • [NEW] Added the capability of creating electrolyte compounds to the Compound Creator
  • [NEW] Added interaction parameter bounds to the Data Regression utility
  • [FIX] Several bug fixes and enhancements to PFR and CSTR models
  • [FIX] Minor bug fixes

New in DWSIM 3.7 Build 5952 (Apr 20, 2016)

  • [CHG] Changed target .NET Framework to v4.0 for Windows XP compatibility
  • [FIX] Bug fixes

New in DWSIM 3.7 Build 5905 (Mar 3, 2016)

  • [NEW] Implemented inline unit conversion for Property Grid
  • [NEW] Script Manager comment/uncomment/indent lines
  • [CHG] flowsheet object selection rectangle now works from all directions
  • [CHG] Updated cut/paste shortcut key behavior
  • [FIX] Bug fixes and enhancements

New in DWSIM 3.7 Build 5901 (Mar 1, 2016)

  • [NEW] Added Undo/Redo capability for Flowsheet Objects, Compounds and Property Packages
  • [NEW] Added cross-simulation Cut/Copy/Paste capability for Flowsheet Objects
  • [NEW] New 'Edit' menu
  • [NEW] Added data copy button to Spreadsheet and Material Stream list (Mono only)
  • [NEW] Added SRK fugacity GPU calc routine
  • [CHG] Minor changes and UI enhancements
  • [FIX] Fixed Spreadsheet UO calculation taking too long to finish
  • [FIX] Fixed Nested Loops PT/PV Flash mismatch for single-compound mixtures
  • [FIX] General bug fixes

New in DWSIM 3.6 Build 5884 (Feb 11, 2016)

  • [FIX] Performance enhancements and bug fixes

New in DWSIM 3.6 Build 5876 (Feb 4, 2016)

  • [NEW] DWSIM now runs in 64-bit mode on 64-bit operating systems. To run in 32-bit mode, start "DWSIM_32.bat"
  • [NEW] New Pipe calculation modes: Specify Outlet Pressure / Outlet Temperature
  • [NEW] Sour Water Property Package
  • [CHG] Updated User Interface
  • [CHG] Enabled CoolProp Property Package for 64-bit Linux
  • [CHG] Changed XML report style
  • [FIX] Various stability enhancements and bug fixes when running in Mono mode

New in DWSIM 3.6 Build 5854 Beta (Jan 12, 2016)

  • [NEW] DWSIM now runs in 64-bit mode on 64-bit operating systems. To run in 32-bit mode, start "DWSIM_32.bat"
  • [NEW] New Pipe calculation modes: Specify Outlet Pressure / Outlet Temperature
  • [CHG] Updated UI theme
  • [CHG] Enabled CoolProp Property Package for 64-bit Linux
  • [CHG] Changed XML report style
  • [FIX] Various stability enhancements and bug fixes when running in Mono mode

New in DWSIM 3.6 Build 5851 Beta (Jan 9, 2016)

  • [NEW] DWSIM now runs in 64-bit mode on 64-bit operating systems.
  • To run in 32-bit mode, start "DWSIM_32.bat"
  • [CHG] Updated UI theme
  • [CHG] Enabled CoolProp Property Package for 64-bit Linux
  • [FIX] Various bug fixes and stability enhancements when running on Mono

New in DWSIM 3.6 Build 5849 Beta (Jan 7, 2016)

  • [NEW] DWSIM now runs in 64-bit mode on 64-bit operating systems. To run in 32-bit mode, start "DWSIM_32.bat"
  • [CHG] Updated UI theme
  • [CHG] Enabled CoolProp Property Package for 64-bit Linux
  • [FIX] Stability enhancements when running in Mono mode

New in DWSIM 3.6 Build 5813 Beta (Dec 2, 2015)

  • [NEW] DWSIM now runs in 64-bit mode on 64-bit operating systems. To run in 32-bit mode, start "DWSIM_32.bat"
  • [CHG] Update UI theme
  • [FIX] Stability enhancements when running in Mono mode

New in DWSIM 3.5 Build 5800 (Nov 19, 2015)

  • [NEW] IAPWS-08 Seawater Property Package
  • [NEW] Black-Oil Property Package - [NEW] Debug Object tool
  • [CHG] Enhanced Flowsheet Solver to increase calculation speed
  • [CHG] Enhanced Compound Creator to handle black-oil fluids
  • [CHG] Updated flowsheet drawing code, added new alignment tools
  • [FIX] General bug fixes and optimizations

New in DWSIM 3.5 Build 5778 Beta (Nov 5, 2015)

  • [CHG] Reworked math routines to increase calculation speed

New in DWSIM 3.4 Build 5740 (Sep 20, 2015)

  • [NEW] Added Spreadsheet Cell support to Sensitivity Analysis and Optimization tools
  • [NEW] 'Power' specification added to Pump model
  • [NEW] New Heat Exchanger calculation mode
  • [NEW] Added API help link to script editors
  • [NEW] Added 'Replace' function to compounds added to the simulation
  • [NEW] Added an option to backup file when saving an existing simulation
  • [CHG] Replaced script editing component to enable code intellisense (Windows only) [CHG] Reworked Electrolyte Flash algorithms - [FIX] Fixed Liquid Phase Enthalpy calculation in Activity Coefficient-based PPs - [FIX] Fixed Gibbs reactor energy balances
  • [FIX] General bug fixes and optimizations

New in DWSIM 3.4 Build 5644 (Jun 16, 2015)

  • NEW: Added support for Heterogeneous Catalytic reactions
  • NEW: UNIFAC Interaction Parameter Regression Tool
  • NEW: Custom UO input and output variables
  • NEW: Mouse double-click on flowsheet objects opens specific property editor windows
  • NEW: Added three new sample flowsheets
  • CHG: New Welcome Screen
  • CHG: Human-readable error messages
  • CHG: Flowsheet UO compound mapping
  • CHG: Copy and Paste EOS interaction parameters
  • CHG: Minor usability enhancements
  • CHG: Changed Reid Vapor Pressure calculation procedure
  • FIX: Implemented limiter for parallel conversion reactions
  • FIX: Spec Op general fixes
  • FIX: Fixed conversion and equilibrium reactor expression parsing
  • FIX: General bug fixes

New in DWSIM 3.4 Build 5608 (May 12, 2015)

  • [NEW] NIST-MODFAC Property Package
  • [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

New in DWSIM 3.3 Build 5517 (Feb 10, 2015)

  • [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

New in DWSIM 3.3 Build 5488 (Jan 12, 2015)

  • [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

New in DWSIM 3.2 Build 5398 (Oct 13, 2014)

  • [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

New in DWSIM 3.2 Build 5390 (Oct 6, 2014)

  • [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

New in DWSIM 3.2 Build 5349 (Aug 26, 2014)

  • [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

New in DWSIM 3.2 Build 5309 (Jul 23, 2014)

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

New in DWSIM 3.2 Build 5296 (Jul 3, 2014)

  • [NEW] New Phase Identification Algorithm based on the work of Venkatarathnam
  • [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

New in DWSIM 3.1 Build 5265 (Jun 2, 2014)

  • [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%

New in DWSIM 3.1 Build 5259 Beta (May 27, 2014)

  • [NEW] Rewritten flowsheet solver for faster calculation times and recycle optimization
  • [NEW] CoolProp Property Package
  • [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

New in DWSIM 3.0 Build 5209 (Apr 7, 2014)

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

New in DWSIM 3.0 Build 5206 (Apr 4, 2014)

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

New in DWSIM 3.0 Build 5162 (Feb 20, 2014)

  • [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.

New in DWSIM 3.0 Build 5142 (Jan 30, 2014)

  • [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
  • [FIX] Fixed bug #14: Sensitivity Analysis Definition cannot be saved
  • [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

New in DWSIM 3.0 Build 5114 (Jan 3, 2014)

  • [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

New in DWSIM 3.0 Build 5065 (Nov 15, 2013)

  • [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

New in DWSIM 3.0 Build 5031 (Oct 15, 2013)

  • [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

New in DWSIM 3.0 Build 4865 Preview 6 (Apr 30, 2013)

  • This preview build includes some GPU calculation routines (PR/UNIFAC/LKP fugacity coeff.) that runs up to 20x faster on modern CUDA/OpenCL devices. The speed gains are more noticeable on simulations with lots of compounds. More GPU functions will be added with time. If you have a CUDA/OpenCL capable device, visit this link for more information on how to setup your system: http://www.codeproject.com/Articles/572583/CUDA-Programming-Model-on-AMD-GPUs-and-Intel-CPUs
  • Also in this preview is a new "immiscible" VLLE flash algorithm that extends the concept of the Immsicible Peng-Robinson option to the rest of Property Packages, while being much faster than the rigorous three-phase flash algorithm. The immiscible compound can be selected using the key compound box for the second liquid phase search in the Advanced Settings tab for Thermo & Reactions. You will be able to select more than one compound, but only the first will be the immiscible one.
  • You can now view SLE equilibrium lines on the binary diagram utility. Just choose any flash algorithm EXCEPT the SLE one, since it cannot calculate VLE equilibrium lines (bubble and dew points), but it is used by the others to calculate the SLE lines.
  • The electrolyte subsystem is still being worked on. It should be fully implemented in the next preview build.

New in DWSIM 2.1 Build 4819 (Apr 30, 2013)

  • [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

New in DWSIM 2.1 Build 4764 (Jan 17, 2013)

  • [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

New in DWSIM 2.1 Build 4680 (Oct 25, 2012)

  • [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

New in DWSIM 2.1 Build 4605 (Aug 11, 2012)

  • [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

New in DWSIM 2.1 Build 4569 (Jul 6, 2012)

  • [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

New in DWSIM 2.1 Build 4534 (Jul 6, 2012)

  • [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

New in DWSIM 2.1 Build 4513 (May 11, 2012)

  • Contains some general fixes and enhancements for the flash algorithms that increases their reliability and stability.

New in DWSIM 2.1 Build 4503 (May 2, 2012)

  • [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

New in DWSIM 2.1 Build 4466 (Mar 30, 2012)

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

New in DWSIM 2.1 Build 4463 (Mar 22, 2012)

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

New in DWSIM 2.1 Build 4452 (Mar 12, 2012)

  • [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

New in DWSIM 2.1 Build 4438 (Feb 28, 2012)

  • [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

New in DWSIM 2.1 Build 4422 (Feb 15, 2012)

  • Overall speed and usability improvements
  • Added drag-and-drop support for opening simulations/cases from Windows Explorer

New in DWSIM 2.1 Build 4416 Beta (Feb 6, 2012)

  • [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

New in DWSIM 2.1 Build 4410 Beta (Jan 30, 2012)

  • [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

New in DWSIM 2.1 Build 4407 Beta (Jan 30, 2012)

  • [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

New in DWSIM 2.1 4404 Beta (Jan 23, 2012)

  • [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)

New in DWSIM 2.0 Build 4258 (Aug 30, 2011)

  • [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)

New in DWSIM 2.0 Build 4252 (Aug 30, 2011)

  • [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

New in DWSIM 2.0 Build 4251 (Aug 30, 2011)

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

New in DWSIM 2.0 Build 4249 (Aug 22, 2011)

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

New in DWSIM 2.0 Build 4235 (Aug 8, 2011)

  • It includes a fix for the shell and tube heat exchanger shell side pressure drop calculation, adds a password-protect feature for simulation files and changes the PFD to centralize objects, giving the impression of an infinite area (like HYSYS/UNISIM Design).

New in DWSIM 2.0 Build 4220 (Jul 26, 2011)

  • [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

New in DWSIM 2.0 Build 4189 Preview (Jun 22, 2011)

  • [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
  • [NEW] Integrated, context-sensitive Help system
  • [FIX] General bug fixes and speed improvements

New in DWSIM 1.8 Build 4101 (Mar 28, 2011)

  • [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

New in DWSIM 1.8 Build 4080 (Mar 5, 2011)

  • [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

New in DWSIM 1.8 Build 3947 (Oct 25, 2010)

  • [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

New in DWSIM 1.8 Build 3922 (Sep 28, 2010)

  • [NEW] COSMO-SAC Property Package based on the JCOSMO library
  • [CHG] Improvements to the Custom UO script editor
  • [CHG] Updated Plugin Interface definition

New in DWSIM 1.8 Build 3908 (Sep 14, 2010)

  • [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

New in DWSIM 1.8 Build 3905 (Sep 13, 2010)

  • [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

New in DWSIM 1.7 Build 3875 (Aug 12, 2010)

  • [NEW] Added German translation

New in DWSIM 1.7 Build 3868 (Aug 6, 2010)

  • This release includes the interface for external plugin development (specific documentation to come later) and updates to rigorous column solvers (IO and SC).
  • Being honest with you, the Inside-Out and Simultaneous Correction methods to solve distillation columns were not converging. So I decided to review and rewrite some parts of the code, which ended up in adding stability and real convergence.

New in DWSIM 1.7 Build 3850 (Jul 19, 2010)

  • [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

New in DWSIM 1.7 Build 3840 (Jul 9, 2010)

  • [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

New in DWSIM 1.6 Build 3752 (Apr 12, 2010)

  • [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

New in DWSIM 1.6 Build 3676 (Jan 30, 2010)

  • [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

New in DWSIM 1.6 Build 3618 (Jan 30, 2010)

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

New in DWSIM 1.6 Build 3605 (Jan 30, 2010)

  • [NEW] Added Spanish GUI translation
  • [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

New in DWSIM 1.5 Build 3399 (Jan 30, 2010)

  • [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

New in DWSIM 1.5 Build 3398 (Jan 30, 2010)

  • [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

New in DWSIM 1.5 Build 3377 (Jan 30, 2010)

  • [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

New in DWSIM 1.5 Build 3372 (Jan 30, 2010)

  • [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

New in DWSIM 1.5 Build 3353 (Jan 30, 2010)

  • [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

New in DWSIM 1.4 (Jan 30, 2010)

  • [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

New in DWSIM 1.3 (Jan 30, 2010)

  • 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