WinSim DESIGN II 16.27c for Windows

Description

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⚙️ WinSim DESIGN II 16.27 for Windows — Process Simulation Software

WinSim DESIGN II for Windows version 16.27 is the current release of WinSim Inc.’s steady-state and dynamic process simulator for chemical and hydrocarbon plants. Issued on 24 March 2026, DESIGN II 16.27 is a fixes-and-upgrades build for engineers who model refining, gas processing, gas treating, petrochemicals, refrigeration, pipelines, fuel cells, ammonia, methanol, sulfur, and hydrogen facilities.

If your store lists this build as DESIGN II 16.27c, treat that label as the package or SKU name. The vendor announcement and public release notes call the software version 16.27. The notes below follow that official list and do not add unpublished 16.27c-only changes.

DESIGN II is built for rigorous flowsheet work: pure-component properties, crude assays, recycle loops, columns, heat exchangers, lines, separators, meters, and case studies, with results that can be sent to Microsoft Excel. It is a practical fit for process design, rating, debottlenecking, and operating-case checks where the same model must be rerun in more than one unit system.

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🏭 What DESIGN II is used for

WinSim positions DESIGN II for Windows as rigorous process simulation for chemical and hydrocarbon processes. Typical plant types named by the vendor include:

• 🛢️ Refining and rigorous refinery columns
• 🔥 Gas processing, expander plants, and lean-oil plants
• 💧 Gas treating, glycol and TEG dehydration, and single or mixed amine units
• ❄️ Refrigeration and LNG liquefaction
• 🛣️ Gathering systems, transmission lines, and pipeline models
• 🧪 Petrochemical, ammonia, methanol, sulfur, and hydrogen plants
• 🔋 Fuel cell systems
• 📉 Relief-valve simulation over time and depressurizer analysis

Supporting calculations include physical properties, two-phase pipeline modeling, heat exchanger sizing and rating, separator sizing and rating, and VLE, VLLE, and LLE data regression through ChemTran.

🆕 What is new in DESIGN II 16.27

Version 16.27, released 24 March 2026, is a maintenance release with both fixes and upgrades. It follows version 16.26 (29 October 2025) and version 16.25 (29 August 2025). The published functional upgrade is in the methanation reactor. The other items are calculation and reporting fixes.

• 🔬 Methanation reactor. Feed streams may now contain up to 30 ppmv of oxygen.
• 📊 Case Study Excel transfer. Results transfer to Excel is fixed after a print problem in the Case Study print header of the DESIGN II output file.
• 📏 Line sizing. The maximum-velocity line sizing option is fixed when several line sizing commands are present in the input file.
• 🧮 Case Study entropy. Total stream entropy is calculated correctly for non-English dimensional units.
• 💧 Distillation free water. Free water in feed streams to the Distill column is fixed for a specific case.
• ⏱️ Flowmeter. Discharge coefficient (Cd) is fixed under certain conditions.
• 🛠️ Miscellaneous small enhancements and fixes are listed in the vendor release notes.

🔐 The password algorithm changed with the 16.00 release and still applies to 16.27. A password from an older major release will not unlock this build. Accounts on maintenance (MSS) or a usage agreement should use the 16.x password emailed to the account contact. Eligible customers can request a replacement from WinSim technical support.

⭐ Highlights of DESIGN II for Windows

These are core Professional-package capabilities of DESIGN II for Windows. They are part of the product, not features added only in 16.27.

📚 Properties, crudes, and thermodynamics

• Database of 1,200 pure components
• ChemTran module for added components and data regression
• Crude assay data and a library of 38 world crudes
• Distillation curve input and output
• Thermodynamic properties and transport properties
• Unit-module-specific thermodynamics
• Input and output unit control, including non-English dimensional sets
• Critical properties, water-saturated feeds, and three Reid vapor pressure methods
• CO2 freeze in streams and hydrate prediction

🔁 Flowsheet solution

• Windows user interface and Windows simulator kernel
• Automatic recycle analysis
• Advanced recycle convergence
• Reverse recycle calculations
• Lost-work analysis
• About 300 example flowsheets
• Manuals in Windows help files

🏗️ Equipment and rating

• Column calculations with tray-by-tray hydraulics and tray sizing
• Heat exchanger rating: single phase, two-phase E and F shells, two-phase air cooler, and two-phase plate-fin
• Heating and cooling curves
• Separator sizing
• Flowmeter sizing
• Polytropic compressor analysis
• Depressurizer analysis
• Line module calculations, pressure-drop tables, process line calculations, heat transfer to surroundings, and slug-flow analysis

📤 Reporting and automation

• Data export to Microsoft Excel
• Case Study feature for repeated runs and transferred results
• Callable from Visual Basic and Visual C++
• Inline Fortran for user calculations where the license and workflow support it

💡 Why engineers keep a current 16.x build

DESIGN II 16.27 is most useful if you already run 16.x models and need the published fixes rather than a new major version. Case Study work benefits directly: Excel transfer, non-English entropy, and print-header handling are all called out in the 16.27 notes. Line sizing jobs with more than one sizing command, Distill-column feeds that include free water, flowmeter Cd checks, and methanation feeds with trace oxygen are the other named cases.

Staying on the current 16.x password scheme also avoids a failed unlock after install. WinSim changed that algorithm at 16.00, so a 15.x password is not interchangeable with 16.27.

💻 System requirements

Requirements below are those published by WinSim for DESIGN II for Windows.

• 🪟 Operating system: Microsoft Windows 11, 10, 8, 7, Vista, or XP. Windows 10 x64 is highly recommended.
• 🍎 Mac: There is no native Macintosh edition. WinSim states that DESIGN II runs under Parallels.
• 🔧 Processor: Intel Pentium or another 32-bit PC-compatible CPU with a math coprocessor. A 3.0 GHz or faster Intel quad-core CPU is highly recommended.
• 🧠 Memory: 512 MB minimum on Windows XP (2,048 MB recommended); 4 GB on Windows 7 x86; 8 GB on Windows 7 x64 (16 GB recommended).
• 💾 Disk: 300 MB free for installation and 2,000 MB free for the simulation work area.
• 🖱️ Other hardware: mouse or pointing device, Windows-compatible monitor, CD-ROM only if you are not installing from the internet or a local network, and a USB port if the license uses a hardware security key.
• 📗 Excel: Microsoft Excel 2003 or later, including 2007, 2010, 2013, 2016, and 2019, is required only when specifications or results move through a spreadsheet. Excel is licensed separately.

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🔑 Licensing note for version 16.27

DESIGN II 16.27 uses the password scheme introduced in version 16.00. Install the software first, then apply the current license password. Maintenance and usage-agreement customers should confirm that the account contact received the 16.x password before scheduling a plant-model upgrade. Hardware-key licenses still need the USB port called out in the system requirements.

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📌 Interesting facts

• 🏢 WinSim Inc. has marketed DESIGN II for Windows since 1995, after buying the rights from ChemShare Corporation.
• 🌍 WinSim reports more than 2,000 active DESIGN II users worldwide.
• 📍 The company is based in Richmond, Texas, outside Houston.
• 📅 Version 16.27 was posted on 24 March 2026 and is the latest public release named on winsim.com.
• 🧪 The only named upgrade in that release is methanation feed oxygen up to 30 ppmv. The other notes are fixes.
• 📊 Excel transfer is a long-standing DESIGN II workflow, which is why the 16.27 Case Study print-header fix matters for reporting.
• 🔐 Password handling changed at 16.00 and remains in force for 16.27.

Product scope, system requirements, and the 16.27 release announcement are published by WinSim Inc. at winsim.com. Confirm package contents, license type, and password eligibility before purchase if this listing is a license, upgrade, or installer for an existing DESIGN II account.

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★★★★★ WinSim DESIGN II 16.27 is the build we wanted for gas-treating and refrigeration cases. The methanation oxygen limit, Case Study Excel transfer, and non-English entropy fix are the changes we actually use. Flowsheet setup is still straightforward, and the 1,200-component database plus ChemTran covers our amine and NGL work without extra property tools.