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Invensys Process Systems (IPS), a global technology, software and consulting firm, has released the newest version of SimSci-Esscor’s PRO/II software, a steady-state process simulator used to design, analyze.
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I'm the developer of DWSIM. Being fair, DWSIM cannot be compared with those expensive commercial simulators (i.e. HYSYS), specially when dealing with complicated/specialized processes.
While they have a lot of developers and dedicated people just for user support, almost every new substantial feature comes from an acquisition (they buy the company and get the code). I can't do the same, unfortunately. I have to stick to my limited knowledge, though I'm always trying to learn new things. Bugs will always be there, but I'm really fast on fixing them, and I'm really proud of that. What you won't find for years to come is a process simulator in a mobile device, except for DWSIM.
DWSIM is coded in.NET languages and the conversion for mobile was relatively fast, but definitely not easy. In case of HYSYS, this is simply impossible because the thermo engine is coded in Fortran, unless they implement some kind of 'cloud solver', but then you'd have to be connected to the internet all the time. I've used chemcad, hysys, vmgsim and proii.
If you're talking about accuracy. They should all be comparable. If you're using peng robinson on a slate of hydrocarbons and simple gasses then results should be similar. Some applications like aspen plus may include specialised property packages or component libraries so most important thing would be to make sure your software can handle the chemicals you want to model. Hysys will not be able to model oleochemicals for example. In terms of usability I'd say hysys is the best (unisim/petrosim included as they share a lot of the same source code).
The reason being hysys is a lot more flexible in terms of where you can place your specifications. For example specifying a temperature at the outlet of a heater to calculate the inlet. Its more intuitive in that way. Also its event driven, meaning it calculates as you define your simulation (like excel). So when it can't converge you know exactly which step screwed it up.