HYSYS employs a hybrid architecture:
Key Innovation: The Active simulation approach. In HYSYS, changing a parameter (e.g., a feed flow rate) instantly updates all downstream calculations without requiring a manual "run" command. This is achieved through a bidirectional data flow and an event-driven solver.
In the world of chemical engineering and process design, few software packages command the respect and widespread utility of Aspen HYSYS (formerly known simply as HYSYS). Originally developed by Hyprotech in the late 1970s and now a flagship product of AspenTech, Aspen HYSYS is an industry-leading process simulation tool used extensively for steady-state and dynamic process modeling.
While competitors like Aspen Plus excel in the chemicals and pharmaceutical sectors, Aspen HYSYS is the gold standard for the oil, gas, refining, and upstream energy industries. From designing a natural gas sweetening plant to troubleshooting a crude distillation unit, HYSYS provides engineers with the digital sandbox to predict thermodynamic behavior, optimize performance, and prevent costly operational errors.
This article explores the core features, thermodynamics, applications, and future trends surrounding Aspen HYSYS, providing a complete overview for students, engineers, and industry veterans.
This specialized license adds rigorous refinery reactor models: FCC, catalytic reformer, coker, and visbreaker. It uses the "Refining Property Package" based on the API Tech Data Book.
HYSYS models can be exported to 3D plant design tools (like SmartPlant or AutoCAD Plant 3D). This allows P&ID synchronization—if a line size changes in the simulation, the 3D model gets a notification.
A common question is: "Should I use Aspen HYSYS or Aspen Plus?"
| Feature | Aspen HYSYS | Aspen Plus | | :--- | :--- | :--- | | Primary Industry | Oil, Gas, Refining, Upstream | Chemicals, Pharmaceuticals, Solids | | Fluid Types | Hydrocarbons, sour water, glycol | Electrolytes, polymers, solids, batch | | Thermodynamics | Peng-Robinson, SRK, CPA (Fast) | Very broad (UNIFAC, PC-SAFE, etc.) | | User Experience | Highly interactive, real-time feedback | Sequential modular, more rigorous | | Dynamic Simulation | Native and industry-standard | Available but less common | | Batch Processes | Limited | Excellent (BatchSep) |
Guideline: If you are processing natural gas, crude oil, or refinery streams, use Aspen HYSYS. If you are dealing with specialty chemicals, pharmaceuticals, or electrolytes, use Aspen Plus.