![]() It’ll be something like Start>Aspentech>Aspentech Documentation. #How to add a hypothetical compenent in unisim design install#group will install the documentation in your Windows start menu. If you work at a large company, probably the I.T. Note that if you try to combine streams of different packages/component lists you’ll get into headaches. When you pick a different fluid package, it will automatically consider only the components attached to that package. Click on it: you should find a drop-box that lets you change from Basis-1 to any of the other fluid packages you created. At the bottom of the main window there is the fluid package being applied by the stream. Then, in your simulation, double-click on any stream like you were going to define it’s properties. Meanwhile, Basis-2 could be ASME Steam and have Component List-2: Water attached to it. For example, the fluid package called Basis-1 could be Peng-Robinson and have Component List-1: Methane, Ethane attached to it. In the windows where you set these up, you can add additional fluid packages and component lists. When you set up your simulation, you always have to set up a component list and a fluid package (aka thermodynamic method) before you can start. – Added note that multiple fluid packages can be run in the same simulation Steam tables are only for 100% water systems but are the best choice for these systems Utilities with water – use one of the steam tables. High-hydrogen units like hydrotreaters – GS, PR, PR-Twu, or ZJ For hydrocarbons and hypocomponents use PR, SRK, or other EOS Are many defaults, others estimated by BP & Density, most user can overwrite Use PR for MEG, DEG, but be careful of results outside of standard range Glycol Package: TEG circulation rates, purities of lean TEG, dew points and water content of gas stream used in natural gas dehydration. Grayson-Streed: Chao-Seader extention with emphasis on hydrogen, good if heavy hydrocarbon with lots of hydrogen like hydrotreaters. Chao-Seader: hydrocarbons if T = 0-500C, P<10,000 kPa Esso K: only heavy Hydrocarbons low Press ![]() Braun K10 Model: strictly applicable to only heavy Hydrocarbons low pressures Modified Antonie: OK for low pressure ideal systems However, Braun K10 is still good for vacuum units. Now with modern computers EOS models are easy to run, so vapour pressure models are used less often. Historically they were used since computationally they are easier. Sour PR/SRK: sour water systems with H2S, CO2, NH3 at low to moderate P Kabadi-Danner: modified SRK with Liquid-Liquid-Equilibrium calcs for liquid H2O-Hydrocarbon systems, especially dilute, parameters must be tuned to experimental data Zudkevitch Joffee: modified RK method for VLE, systems with H2 BWRS: modified BWR for multicomponents, requires experimental data Lee-Kesler-Pockler: modified BWR for non-polar substances, mixtures MBWR: a modification of the old BWR models: 32 parameters, more empirical approach, so it works very well in the range where it has data Use this to build your own model when necessary GCEOS: generalized cubic EOS for user to add their own parameters. TST: hydrocarbons with non-ideal components (used in glycol package) PR-Twu, SR-Twu for hydrogen solutes? In liquid hydrocarbons Similar accuracy/use as Peng Rob, but in Hysys SRK has less enhancements than PR. Slower calculation speeds than Peng-Robinson PRSV: extends PR to moderately non-ideal systems and better represents poor components and mixtures. Peng-Robinson is most enhanced in Hysys, highest T & P range, has special treatment for key components, largest binary interaction database: good standard for hydrocarbons Activity coefficient like NRTL is poor model for hydrocarbons Vapour pressure models are OK at low pressures Hydrocarbons: normally use an Equation of State method You can have a Peng-Robinson Package running the calculations for your hydrocarbons, and the ASME Steam Package running the steam and water calculations. One trick to remember is that you can use different fluid packages and different component lists in different parts of the simulation. They are really quite good at quickly suggesting the best method to use. If you are in doubt Aspentech Support can always give you personalized advice. ![]() You can combine this post with the Hysys manual, the Hysys property package wizard, Aspentech Support’s advice, and books on simulation, and put it all together to choose the best package in each case. I watched an old “webinar” (presentation given through the Internet) on their property packages and took some notes. You always have to pick a “fluid package” when you use the program: a thermodynamic method it will use to calculate properties, especially vapour-liquid equilibria. Aspentech’s Hysys is a process simulation tool. ![]()
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