When you lodge a bug report with AspenTech support, you are dealt with very nicely and efficiently, and generally get your problem resolved in a sensible amount of time. Perhaps it's because those bugs aren't really publicised. I personally know of a number of bugs in HYSYS, but it is still the industry standard, despite these. You could argue that UniSim is more *likely* to be correct, because why would you change something unless you disagree with it? However, there is no guarantee that the changes are an improvement. pressure/flow, and fluid flashes) give slightly different numbers. *Some* of the underlying correlations (i.e. You can still open up (to a limited, unguaranteed extent) HYSYS 2006 models with UniSim. I also hear that some UOP reactors are included, but I haven't has an opportunity to explore this. I hear that some of the "Modules" ShadowPlant are included, but I haven't had an opportunity to explore this. I have heard on the grapevine that there are a few more unit operations on the PFD-building palette, because Honeywell had already invested a lot of time in building models specific to certain processes.Īt a fundamental level, it is based on HYSYS code, and so it looks essentially the same (with the exception of the different window-icon and a different file extension). I haven't used it myself, but I know someone who has.
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